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Navegação por autor "10132"
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GERALDO, BIANCA
; ARAUJO, LEANDRO G. de
; VICENTE, ROBERTO
; TADDEI, MARIA H.T.; CHEBERLE, SANDRA M.; MARUMO, JULIO T.
.
Radioanalytical methods for sequential analysis of actinide isotopes in activated carbon filter‑bed waste.
Journal of Radioanalytical and Nuclear Chemistry,
v. 326,
p. 1559-1568,
2020.
DOI:
10.1007/s10967-020-07435-8
Abstract:
In this work, we compare methods for the sequential determination of U and the transuranium elements Np, Pu, Am, and
Cm. The chemical yield, the time spent in the analysis, the amount of secondary waste, and the costs of each method are
the aspects of interest. Two methods were compared: extraction chromatography (EC) and ion exchange plus extraction
chromatography (IE + EC). The chemical yields of (EC) and (IE + EC) were similar for all radionuclides. The (EC) method
is the more effective with respect to time of analysis, the amount of secondary waste and costs.
Palavras-Chave:
radioisotopes;
radiochemistry;
cost benefit analysis;
ion exchange;
radiopharmaceuticals;
tracer techniques
GERALDO, BIANCA; ARAUJO, LEANDRO G. de; VICENTE, ROBERTO; TADDEI, MARIA H.T.; CHEBERLE, SANDRA M.; MARUMO, JULIO T.
Radioanalytical methods for sequential analysis of actinide isotopes in activated carbon filter‑bed waste.
Journal of Radioanalytical and Nuclear Chemistry,
v. 326,
p. 1559-1568,
2020.
DOI:
10.1007/s10967-020-07435-8.
Disponível em: http://200.136.52.105/handle/123456789/31657. Acesso em: $DATA.
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GERALDO, BIANCA
; ARAUJO, LEANDRO G. de
; TADDEI, MARIA H.T.; FERREIRA, MARCELO T.; MADUAR, MARCELO F.
; VICENTE, ROBERTO
; MARUMO, JULIO T.
.
Radiochemical characterization of spent filter cartridges from the primary circuit of a research reactor.
Journal of Radioanalytical and Nuclear Chemistry,
v. 322,
n. 3,
p. 1941-1951,
2019.
DOI:
10.1007/s10967-019-06864-4
Abstract:
Radiochemical-based analyses have been used for the characterization of radioactive waste. Nevertheless, the determination
of alpha, beta and gamma emitters by radiochemical analysis of spent cartridge filters from a swimming-pool type reactor
has not been previously addressed. This work aims at identifying and quantifying the radionuclides present in this waste,
including the difficult to measure radionuclides. The distribution of the radionuclides in the filter was investigated by the
determination of gamma-emitting nuclides and the z-score of the measured activity concentrations. The results indicated that
all the filters are homogeneous, meeting the homogeneity criteria recommended by the International Atomic Energy Agency.
Palavras-Chave:
alpha decay radioisotopes;
beta decay radioisotopes;
filters;
gamma decay;
pool type reactors;
radioactive waste management;
radioactive wastes;
radioactivity;
radiochemical analysis;
research reactors
GERALDO, BIANCA; ARAUJO, LEANDRO G. de; TADDEI, MARIA H.T.; FERREIRA, MARCELO T.; MADUAR, MARCELO F.; VICENTE, ROBERTO; MARUMO, JULIO T.
Radiochemical characterization of spent filter cartridges from the primary circuit of a research reactor.
Journal of Radioanalytical and Nuclear Chemistry,
v. 322,
n. 3,
p. 1941-1951,
2019.
DOI:
10.1007/s10967-019-06864-4.
Disponível em: http://repositorio.ipen.br/handle/123456789/30847. Acesso em: $DATA.
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GUILHEN, SABINE N.
; WATANABE, TAMIRES
; SILVA, THALITA T.
; ROVANI, SUZIMARA; MARUMO, JULIO T.
; TENORIO, JORGE A.S.; MASEK, ONDREJ; ARAUJO, LEANDRO G. de
.
Role of point of zero charge in the adsorption of cationic textile dye on standard biochars from aqueous solutions: selection criteria and performance assessment.
Recent Progress in Materials,
v. 4,
n. 2,
p. 1-20,
2022.
DOI:
10.21926/rpm.2202010
Abstract:
The point of zero charge (PZC) is an inherent electrokinetic property of biochars (BC). It influences the adsorption process under certain pH conditions. Herein, we report the method of determination of the PZC values of ten standard BCs. We used the salt addition method to select the BCs with suitable properties for methylene blue (MB) removal from aqueous solutions. The standard BCs were obtained by pyrolyzing five different biomasses at two distinct temperatures (550°C and 700°C). The BCs derived from rice husk (pHPZC at 7.22 and 7.64 for RH550 and RH700, respectively) and softwood pellets (pHPZC at 6.57 and 6.78 for SWP500 and SWP700, respectively) were selected for their compatibility with cationic dyes such as MB. Results from adsorption experiments indicated the potential use of the RH biochar as an adsorbent for the removal of MB from aqueous solutions. The removal efficiencies were 68.83% and 71.97% for RH550 and RH700, respectively. Considerably low values were obtained for SWP550 and SWP700 (21.61% and 22.84%, respectively). Equilibrium was achieved at 2 h for RH550 and 1 h for RH700, and the adsorption kinetics for the RH BCs could be described by a pseudo-second order equation. The results revealed that even when produced under comparable conditions, BCs obtained from different feedstocks exhibited different cationic dye removing abilities. BCs optimized for the removal of cationic or anionic dyes can be easily engineered by appropriately matching the feedstock with the processing conditions.
Palavras-Chave:
point charge;
adsorption;
biomass;
chars;
methylene blue;
salts;
dyes
GUILHEN, SABINE N.; WATANABE, TAMIRES; SILVA, THALITA T.; ROVANI, SUZIMARA; MARUMO, JULIO T.; TENORIO, JORGE A.S.; MASEK, ONDREJ; ARAUJO, LEANDRO G. de.
Role of point of zero charge in the adsorption of cationic textile dye on standard biochars from aqueous solutions: selection criteria and performance assessment.
Recent Progress in Materials,
v. 4,
n. 2,
p. 1-20,
2022.
DOI:
10.21926/rpm.2202010.
Disponível em: http://repositorio.ipen.br/handle/123456789/33198. Acesso em: $DATA.
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OLIVO-ARIAS, L.P.; ARAUJO, L.G.
.
Structural analysis of polydimethylsiloxane samples.
Latin-American Journal of Physics Education,
v. 14,
n. 3,
p. 3309-1 - 3309-11,
2020.
Abstract:
This work presents a structural analysis of polydimethylsiloxane (PDMS) samples through the study of the mechanical properties of a soft material. For this, the dimensions of the crosslinking samples were modified taking a cure ratio as a reference, to determine the stress-strain, applying the Prony model which the Ansys-Mechanical platform offers. Experimental data was collected from the literature and a force test was performed on three different cylindrical samples (10:1 ratio) of PDMS with a curing agent. Consistent results of the modulus of elasticity as a function of time were obtained. Finally, using the Neo Hookean model, with consideration of hyperelastic material, and employing longer relaxation times, the results showed interesting findings in the parameters of total and directional deformation and other viscoelastic properties for this type of material.
Palavras-Chave:
polymers;
mechanical properties;
fluids;
hydrodynamics;
computer calculations;
viscosity;
elasticity
OLIVO-ARIAS, L.P.; ARAUJO, L.G.
Structural analysis of polydimethylsiloxane samples.
Latin-American Journal of Physics Education,
v. 14,
n. 3,
p. 3309-1 - 3309-11,
2020.
Disponível em: http://repositorio.ipen.br/handle/123456789/31993. Acesso em: $DATA.
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MEDEIROS, VINICIUS L.; ARAUJO, LEANDRO G. de
; RATERO, DAVI R.; PAULA, ALEX S.; MOLINA, EDUARDO F.; JAEGER, CHRISTIAN; MARUMO, JULIO T.
; NERY, JOSE G..
Synthesis and physicochemical characterization of a novel adsorbent based on yttrium silicate: a potential material for removal of lead and cadmium from aqueous media.
Journal of Environmental Chemical Engineering,
v. 8,
n. 4,
p. 1-10,
2020.
DOI:
10.1016/j.jece.2020.103922
Abstract:
A new metallosilicate based on yttrium was synthesized and characterized by XRD, FT-IR, 29Si MAS-NMR, and
89Y MAS-NMR. The mixed framework of the material was confirmed by the detection of distinct chemical shift
groups using 29Si MAS-NMR (at -82 to -87 ppm, -91 to -94 ppm, -96 to -102 ppm, and -105 to -108 ppm), as well
as four distinct chemical shifts in the 89Y MAS-NMR spectrum (at -89, -142, -160, and -220 ppm). Adsorption and
kinetic analyses indicated the potential of the new material for the removal of lead and cadmium from aqueous
media. The adsorption results for lead indicated that dynamic equilibrium was reached after five hours, with
total lead removal of around 94 %, while for cadmium it was reached in the first hour, with total cadmium
removal of around 74 %. The adsorptions of lead and cadmium were modeled using pseudo-first order (PFO) and
pseudo-second order (PSO) kinetic models. Although both models provided high R2 values (0.9903 and 0.9980,
respectively), the PSO model presented a much lower χ2
red value (4.41×10−4), compared to the PFO model
(2.12×10−3), which indicated that the rate-limiting step was probably due to the chemisorption of lead from
the solution onto the yttrium-based metallosilicate.
Palavras-Chave:
adsorbents;
yttrium silicates;
chemisorption;
adsorption;
aqueous solutions;
lead;
cadmium;
silicon 29;
yttrium 89;
nuclear magnetic resonance
MEDEIROS, VINICIUS L.; ARAUJO, LEANDRO G. de; RATERO, DAVI R.; PAULA, ALEX S.; MOLINA, EDUARDO F.; JAEGER, CHRISTIAN; MARUMO, JULIO T.; NERY, JOSE G.
Synthesis and physicochemical characterization of a novel adsorbent based on yttrium silicate: a potential material for removal of lead and cadmium from aqueous media.
Journal of Environmental Chemical Engineering,
v. 8,
n. 4,
p. 1-10,
2020.
DOI:
10.1016/j.jece.2020.103922.
Disponível em: http://repositorio.ipen.br/handle/123456789/31476. Acesso em: $DATA.
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CASAS, A.
; ARAUJO, L.
; GARCIA, R.
; VICENTE, R.
; FRANCO, M.
; MARUMO, J.
.
Synthesis of geopolymers for immobilization of radioactive waste using sewage treatment plant sludge.
In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE,
November 29 - December 2, 2021,
Online.
Proceedings...
Rio de Janeiro: Associação Brasileira de Energia Nuclear,
2021.
Palavras-Chave:
ashes;
binders;
polymers;
radioactive waste management;
sewage sludge;
solidification;
waste processing;
x-ray diffraction;
x-ray fluorescence analysis
CASAS, A.; ARAUJO, L.; GARCIA, R.; VICENTE, R.; FRANCO, M.; MARUMO, J.
Synthesis of geopolymers for immobilization of radioactive waste using sewage treatment plant sludge.
In:
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE,
November 29 - December 2, 2021,
Online.
Proceedings...
Rio de Janeiro: Associação Brasileira de Energia Nuclear,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32555. Acesso em: $DATA.
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OLIVO-ARIAS, L.P.; ARAUJO, L.G.
.
The influence of the initial gas distribution on the dynamics of a three-phase fluidized bed reactor: non-ideal gas condition.
Latin-American Journal of Physics Education,
v. 15,
n. 1,
p. 1312-1 - 1312-6,
2021.
Abstract:
The hydrodynamic evolution of a three-dimensional (3D) liquid-gas-solid fluidized bed reactor was studied using computational fluid dynamics (CFD) simulations, and the results were compared with previous experimental data. The gas-solid and liquid-solid interactions were calculated using the Euler-Euler model, incorporating the kinetic theory for the solid phase. The momentum exchange coefficients for the fluid-solid interactions were calculated using the Gidaspow drag model, and the fluid-fluid interactions by using the Schiller-Naumann model. The predicted gas volume fraction agreed to the Kumar model and showed better performance with the use of higher-order discretization. Furthermore, the Peng Robinson thermodynamic correlation was used to determine the properties of the materials under high severity conditions. The results showed a consistent distribution of the phases, it was quite uniform and there was a reasonable expansion of the bed when gas injection was established as an initial condition.
Palavras-Chave:
computer calculations;
dynamics;
hydrodynamics;
fluidized beds
OLIVO-ARIAS, L.P.; ARAUJO, L.G.
The influence of the initial gas distribution on the dynamics of a three-phase fluidized bed reactor: non-ideal gas condition.
Latin-American Journal of Physics Education,
v. 15,
n. 1,
p. 1312-1 - 1312-6,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32651. Acesso em: $DATA.
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FERREIRA, RAFAEL V. de P.; ARAUJO, LEANDRO G. de
; CANEVESI, RAFAEL L.S.; SILVA, EDSON A. da; FERREIRA, EDUARDO G.A.
; PALMIERI, MAURICIO C.; MARUMO, JULIO T.
.
The use of rice and coffee husks for biosorption of U (total), 241Am, and 137Cs in radioactive liquid organic waste.
Environmental Science and Pollution Research,
v. 27,
n. 29,
SI,
p. 36651-36663,
2020.
DOI:
10.1007/s11356-020-09727-8
Abstract:
Rice and coffee husks (raw and chemically activated) are examined as potential biosorption materials regarding their capacity to
remove U (total), 241Am, and 137Cs. The physical parameters evaluated were the morphological characteristics of the biomass,
real and apparent density, and surface area. Contact times for the batch experiments were 0.5, 1, 2, and 4 h, and the concentrations
tested ranged between 10% of the total concentration and the radioactive waste itself without any dilution. The results were
evaluated by experimental sorption capacity, ternary isotherm, and kinetics models. The kinetics results showed that equilibrium
was reached after 2 h for all biomass. Raw coffee husk showed the best adsorption results in terms of maximum capacity (qmax)
for all three radionuclides, which were 1.96, 39.4 × 10−6, and 46.6 × 10−9 mg g−1 for U, Am, and Cs, respectively. The
biosorption process for the raw and activated rice husks was best represented by the Langmuir ternary isotherm model with
two sites. For the coffee husk, in the raw and activated states, the biosorption process was best described by the modified Jain and
Snoeyink ternary model. These results suggest that biosorption with these biomaterials can be applied in the treatment of liquid
organic radioactive waste containing mainly uranium and americium.
Palavras-Chave:
bioadsorbents;
biomass;
fourier transformation;
infrared radiation;
rice;
liquid wastes;
organic compounds;
uranium;
americium;
cesium;
coffee beans;
gamma spectroscopy
FERREIRA, RAFAEL V. de P.; ARAUJO, LEANDRO G. de; CANEVESI, RAFAEL L.S.; SILVA, EDSON A. da; FERREIRA, EDUARDO G.A.; PALMIERI, MAURICIO C.; MARUMO, JULIO T.
The use of rice and coffee husks for biosorption of U (total), 241Am, and 137Cs in radioactive liquid organic waste.
Environmental Science and Pollution Research,
v. 27,
n. 29,
p. 36651-36663,
2020.
SI,
DOI:
10.1007/s11356-020-09727-8.
Disponível em: http://repositorio.ipen.br/handle/123456789/31406. Acesso em: $DATA.
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PRADO, EDUARDO S.P.; MIRANDA, FELIPE S.; ARAUJO, LEANDRO G. de
; PETRACONI, GILBERTO; BALDAN, MAURICIO R..
Thermal plasma technology for radioactive waste treatment: a review.
Journal of Radioanalytical and Nuclear Chemistry,
v. 325,
n. 2,
p. 331-342,
2020.
DOI:
10.1007/s10967-020-07269-4
Abstract:
In this paper, a review of radioactive wastes treatment using thermal plasma technology is presented as a treatment method
for radioactive waste management.Virtually all waste streams can be treated by the thermal plasma technologies, resulting
in a conditioned product, free from organics and liquids, definitely meeting the acceptance criteria for safe storage and
disposal. The application of the thermal plasma system in the nuclear area is still one of the current research topics due to the
theoretical and practical complexity of the treatment. This paper discusses the performance of the thermal plasma systems,
addressing the advantages and limitations of the method.
Palavras-Chave:
plasma technology;
radioactive waste management;
radioactive waste processing;
management;
processing
PRADO, EDUARDO S.P.; MIRANDA, FELIPE S.; ARAUJO, LEANDRO G. de; PETRACONI, GILBERTO; BALDAN, MAURICIO R.
Thermal plasma technology for radioactive waste treatment: a review.
Journal of Radioanalytical and Nuclear Chemistry,
v. 325,
n. 2,
p. 331-342,
2020.
DOI:
10.1007/s10967-020-07269-4.
Disponível em: http://200.136.52.105/handle/123456789/31625. Acesso em: $DATA.
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OLIVO-ARIAS, L.P.; ARAUJO, L.G.
.
Three-dimensional transient numerical simulation of the solid volume fraction of a fluidized bed: the role of three solution orders using a discretization scheme.
Latin-American Journal of Physics Education,
v. 15,
n. 2,
p. 2303-1 - 2303-10,
2021.
Abstract:
The FLUENT solver employed in the Computational Fluid Dynamics (CFD) has been extensively developed to extend its robustness and precision for a wide range of flow regimes. For that, the FLUENT solver has a numerical method in the pressure-based solver that has traditionally been used for incompressible and slightly compressible flows. The algorithm is based on the pressure that solves the equations in a segregated or decoupled mode. This algorithm has proven to be robust and versatile and has been used cooperatively with a wide range of physical models, including multiphase flows and conjugated heat transfer. However, there are applications in which the convergence rate of the segregated algorithm is not satisfactory, generally due to the need in these coupling scenarios between the continuity and momentum equations. The objective of this article is to validate the Eulerian model to determine the volumetric fractions of the solid phase fraction. For this, we used data from the literature and the PCSIMPLE algorithm (solver) at different orders of solution of the continuity, momentum, and turbulence equations. Also, we determined its efficiency in transient systems and how it would affect the results in the hydrodynamics of a three-phase fluidized bed reactor. The results were significant, thus representing the phenomenon of interaction between the liquid-solid and solid-gas phases.
Palavras-Chave:
hydrodynamic model;
computerized simulation;
computer calculations;
dynamics;
fluidized beds
OLIVO-ARIAS, L.P.; ARAUJO, L.G.
Three-dimensional transient numerical simulation of the solid volume fraction of a fluidized bed: the role of three solution orders using a discretization scheme.
Latin-American Journal of Physics Education,
v. 15,
n. 2,
p. 2303-1 - 2303-10,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32652. Acesso em: $DATA.
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MOYA, MURILO T.M.; ARAUJO, LEANDRO G. de
; LOPES, FERNANDO S.; TEIXEIRA, ANTONIO C.S.C..
TiO2 P25 and Kronos vlp 7000 materials activated by simulated solar light for atrazine degradation.
International Journal of Chemical Reactor Engineering,
v. 21,
n. 10,
p. 1211-1223,
2023.
DOI:
10.1515/ijcre-2022-0186
Abstract:
Photocatalysis-based technologies have been proposed for the treatment of wastewater containing atrazine
(ATZ), a persistent and recalcitrant pollutant. This study
aims to evaluate and compare the efficiency of TiO2 P25 and
TiO2 modified with carbon (C–TiO2 Kronos vlp 7000) in the
photocatalytic degradation of ATZ in aqueous systems. The
experiments were performed in a tubular photochemical
reactor equipped with a compound parabolic collector (CPC)
irradiated by simulated solar light. The materials were
characterized by X-ray diffraction, infrared spectroscopy,
BET specific surface area, and diffuse reflectance spectroscopy. For TiO2 P25, ATZ removals varied in the range
86–100 % after 120 min of irradiation, although the total
organic carbon (TOC) analyses indicated that no significant
ATZ mineralization occurred (<20 %). C–TiO2 Kronos vlp
7000, on the other hand, was not able to completely remove
ATZ after 120 min of irradiation. In this case, pesticide removals were 37–45 % over 120 min, while C–TiO2 performed
better with regard to ATZ mineralization, with 38 % TOC
removal. Given the low mineralization of atrazine, the
intermediate compounds formed were identified for each
photocatalytic material.
MOYA, MURILO T.M.; ARAUJO, LEANDRO G. de; LOPES, FERNANDO S.; TEIXEIRA, ANTONIO C.S.C.
TiO2 P25 and Kronos vlp 7000 materials activated by simulated solar light for atrazine degradation.
International Journal of Chemical Reactor Engineering,
v. 21,
n. 10,
p. 1211-1223,
2023.
DOI:
10.1515/ijcre-2022-0186.
Disponível em: http://repositorio.ipen.br/handle/123456789/34574. Acesso em: $DATA.
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PAIXAO, CLAUDIA M.
; VICENTE, ROBERTO
; ARAUJO, LEANDRO G. de
.
Tratamento de rejeito borra de petróleo pela técnica de pirólise com microondas.
In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE,
November 29 - December 2, 2021,
Online.
Proceedings...
Rio de Janeiro: Associação Brasileira de Energia Nuclear,
2021.
Palavras-Chave:
drying;
industrial wastes;
microwave equipment;
natural radioactivity;
petroleum residues;
pyrolysis;
sludges;
toxicity;
spheroids
PAIXAO, CLAUDIA M.; VICENTE, ROBERTO; ARAUJO, LEANDRO G. de.
Tratamento de rejeito borra de petróleo pela técnica de pirólise com microondas.
In:
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE,
November 29 - December 2, 2021,
Online.
Proceedings...
Rio de Janeiro: Associação Brasileira de Energia Nuclear,
2021.
Disponível em: http://repositorio.ipen.br/handle/123456789/32566. Acesso em: $DATA.
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WATANABE, TAMIRES
; GUILHEN, SABINE N.
; MARUMO, JULIO T.
; ARAUJO, LEANDRO G. de
.
Uranium biosorption by hydroxyapatite and bone meal.
In: AZEVEDO, DIANA C.S. de (Org.); BASTOS-NETO, MOISES (Org.) ENCONTRO BRASILEIRO DE ADSORÇÃO, 13th,
November 25 - December 3, 2020,
Online.
Anais...
Fortaleza, CE: Imprensa Universitária,
2021.
p. 714-718.
DOI:
10.51996/9786588492529
Abstract:
Biosorption has been widely examined for the treatment of aqueous solutions containing uranium, a radiotoxic pollutant. The use of hydroxyapatite and bone meal as potential biosorbents in the removal of uranium (U) from aqueous solutions has not yet been previously addressed. In this work, the efficiency of these biosorbents in the removal of U was investigated according to their adsorption removal capacities. Surface transformations in both materials were observed after U adsorption by scanning electron microscopy combined with energy-dispersive X-ray spectroscopy (SEM/EDS). The biomass/U solution ratio was kept at 0.1 g/5 mL. Contact times for the batch experiments were 15, 30, 60, 120, and 180 min, and the concentration of U tested was 680 mg L-1. The equilibrium was achieved in less than 15 min for both materials. The morphological characteristics of each biomass, before and after biosorption experiments were analyzed. Bone meal highlighted slightly superior adsorption results in terms of maximum capacity (qmax = 33.83 mg g-1), compared to hydroxyapatite (qmax = 33.36 mg g-1), with the removal percentages being also similar, 99.97 and 98.57 %, respectively. The results so far indicate that these materials are potential biosorbents for the treatment of uranium-contaminated solutions, especially liquid radioactive waste.
Palavras-Chave:
adsorption;
uranium;
bone tissues;
apatites
WATANABE, TAMIRES; GUILHEN, SABINE N.; MARUMO, JULIO T.; ARAUJO, LEANDRO G. de.
Uranium biosorption by hydroxyapatite and bone meal.
In:
AZEVEDO, DIANA C.S. de (org.); BASTOS-NETO, MOISES (org.) ENCONTRO BRASILEIRO DE ADSORÇÃO, 13th,
November 25 - December 3, 2020,
Online.
Anais...
Fortaleza, CE: Imprensa Universitária,
2021.
p. 714-718.
DOI:
10.51996/9786588492529.
Disponível em: http://repositorio.ipen.br/handle/123456789/32209. Acesso em: $DATA.
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WATANABE, TAMIRES
; GUILHEN, SABINE N.
; MARUMO, JULIO T.
; SOUZA, RODRIGO P. de; ARAUJO, LEANDRO G. de
.
Uranium biosorption by hydroxyapatite and bone meal: evaluation of process variables through experimental design.
Environmental Science and Pollution Research,
v. 29,
n. 53,
p. 79816-79829,
2022.
DOI:
10.1007/s11356-021-17551-x
Abstract:
Biosorption has been examined for the treatment of aqueous solutions containing uranium, a radiotoxic pollutant. Nevertheless, the evaluation of the role of process variables by experimental design on the use of hydroxyapatite and bone meal as biosorbents for uranium has not yet been previously addressed. In this study, the effects of adsorbent dosage (M), initial uranium concentrations ([U]0), and solution pH were investigated, using a two-level factorial design and response surface analysis. The experiments were performed in batch, with [U]0 of 100 and 500 mg L−1, pH 3 and 5, and adsorbent/uranium solution ratios of 5 and 15 g L−1. Contact time was fixed at 24 h. Removal rates were higher than 88%, with a maximum of 99% in optimized conditions. [U]0 and M were found to be the most influential variables in U removal in terms of adsorption capacity (q). The experiments revealed that bone meal holds higher adsorption capacity (49.87 mg g−1) and achieved the highest uranium removal (~ 100%) when compared to hydroxyapatite (q = 49.20 mg g−1, removal = 98.5%). The highest value of q for both biomaterials was obtained for [U]0 = 500 mg L−1, pH 3, and M = 5 g L−1. Concerning the removal percentage, bone meal achieved the best performance for [U]0 = 500 mg L−1, pH 3, and M = 15 g L−1. Further experiments were made with real radioactive waste, resulting in a high uranium adsorption capacity for both materials, with 22.11 mg g−1 for hydroxyapatite and 22.08 mg g−1 for bone meal, achieving uranium removal efficiencies higher than 99%.
Palavras-Chave:
adsorption;
radioisotopes;
radioactive wastes;
surface;
skeleton
WATANABE, TAMIRES; GUILHEN, SABINE N.; MARUMO, JULIO T.; SOUZA, RODRIGO P. de; ARAUJO, LEANDRO G. de.
Uranium biosorption by hydroxyapatite and bone meal: evaluation of process variables through experimental design.
Environmental Science and Pollution Research,
v. 29,
n. 53,
p. 79816-79829,
2022.
DOI:
10.1007/s11356-021-17551-x.
Disponível em: http://repositorio.ipen.br/handle/123456789/33414. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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GUILHEN, SABINE N.
; ROVANI, SUZIMARA
; ARAUJO, LEANDRO G. de
; TENORIO, JORGE A.S.; MASEK, ONDREJ.
Uranium removal from aqueous solution using macauba endocarp-derived biochar: effect of physical activation.
Environmental Pollution,
v. 272,
p. 1-10,
2021.
DOI:
10.1016/j.envpol.2020.116022
Abstract:
The main aim of this study was to evaluate options for addressing two pressing challenges related to
environmental quality and circular economy stemming from wastage or underutilization of abundant
biomass residue resources and contamination of water by industrial effluents. In this study we focused
on residues (endocarp) from Macaúba palm (Acrocomia aculeata) used for oil production, its conversion
to activated biochar, and its potential use in uranium (U) removal from aqueous solutions. Batch
adsorption experiments showed a much higher uranyl ions (U(VI)) removal efficiency of activated biochar
compared to untreated biochar. As a result of activation, an increase in removal efficiency from
80.5% (untreated biochar) to 99.2% (after activation) was observed for a 5 mg L 1 initial U(VI) concentration
solution adjusted to pH 3 using a 10 g L 1 adsorbent dosage. The BET surface area increased from
0.83 to 643 m2 g 1 with activation. Surface topography of the activated biochar showed a very characteristic
morphology with high porosity. Activation significantly affected chemical surface of the biochar.
FTIR analysis indicated that U(VI) was removed by physisorption from the aqueous solution. The
adsorbed U(VI) was detected by micro X-ray fluorescence technique. Adsorption isotherms were
employed to represent the results of the U adsorption onto the activated biochar. An estimation of the
best fit was performed by calculating different deviation equations, also called error functions. The
Redlich-Peterson isotherm model was the most appropriate for fitting the experimental data, suggesting
heterogeneity of adsorption sites with different affinities for uranium setting up as a hybrid adsorption.
These results demonstrated that physical activation significantly increases the adsorption capacity of
macauba endocarp-derived biochar for uranium in aqueous solutions, and therefore open up a potential
new application for this type of waste-derived biochar.
Palavras-Chave:
aqueous solutions;
vegetable oils;
vegetables;
coconuts;
uranium;
adsorption;
chemical activation;
activated carbon;
charcoal
GUILHEN, SABINE N.; ROVANI, SUZIMARA; ARAUJO, LEANDRO G. de; TENORIO, JORGE A.S.; MASEK, ONDREJ.
Uranium removal from aqueous solution using macauba endocarp-derived biochar: effect of physical activation.
Environmental Pollution,
v. 272,
p. 1-10,
2021.
DOI:
10.1016/j.envpol.2020.116022.
Disponível em: http://repositorio.ipen.br/handle/123456789/31931. Acesso em: $DATA.
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ARAUJO, LEANDRO G. de
; BORBA, TANIA R. de
; FERREIRA, RAFAEL V. de P.; CANEVESI, RAFAEL L.S.; SILVA, EDSON A. da; DELLAMANO, JOSE C.
; MARUMO, JULIO T.
.
Use of calcium alginate beads and Saccharomyces cerevisiae for biosorption of 241Am.
Journal of Environmental Radioactivity,
v. 223-224,
p. 1-10,
2020.
DOI:
10.1016/j.jenvrad.2020.106399
Abstract:
Calcium alginate beads, inactivated Saccharomyces cerevisiae and inactivated S. cerevisiae immobilized in calcium alginate beads (S. cerevisiae–calcium alginate beads) are examined as potential biosorption materials as regards their capacity to remove 241Am. In this study, initial experiments were carried out to evaluate the effects of pH (2 and 4) and 241Am initial concentration: 75, 150, and 300 Bq mL-1. The experiments were conducted in a batch reactor. Higher removal capacity was observed at pH 2 with the use of S. Cerevisiae, whereas pH 4 performed better for the essays with calcium alginate beads and S. Cerevisiae-calcium alginate beads. The pseudo-first-order kinetic model described the kinetics of biosorption. Calcium alginate was the adsorbent of choice to further experiments with synthetic organic liquid waste. A lower removal rate was observed in the organic waste, although calcium alginate beads have also been able to achieve high sorption capacity in less than 4 h. With the organic waste, the highest value of sorption capacity of 241Am was 4.38 × 10−7 mmol g−1 with an initial 241Am concentration of 2.31 × 10−8 mmol L−1.
Palavras-Chave:
bioadsorbents;
sorption;
adsorbents;
americium 241;
saccharomyces cerevisiae;
calcium;
alginates;
ph value
ARAUJO, LEANDRO G. de; BORBA, TANIA R. de; FERREIRA, RAFAEL V. de P.; CANEVESI, RAFAEL L.S.; SILVA, EDSON A. da; DELLAMANO, JOSE C.; MARUMO, JULIO T.
Use of calcium alginate beads and Saccharomyces cerevisiae for biosorption of 241Am.
Journal of Environmental Radioactivity,
v. 223-224,
p. 1-10,
2020.
DOI:
10.1016/j.jenvrad.2020.106399.
Disponível em: http://200.136.52.105/handle/123456789/31615. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
Como referenciar este item
-
BELLINI, MARIA H.
; SOUZA, ALEXANDRE L. de
; SILVA, FABIO F. da; GUILHEN, SABINE N.
; FERREIRA, RAFAEL V. de P.; ARAUJO, LEANDRO G. de
; OLIVEIRA, JOAO E. de
; MARUMO, JULIO T.
.
Variations in essential elements after malignant transformation of kidney epithelial tubular cells.
Medical & Clinical Research,
v. 5,
n. 6,
p. 114-117,
2020.
DOI:
10.33140/MCR.05.06.04
Abstract:
Cell line-based research is a valuable tool for the study of cancer physiopathology and the discovery of new drugs for use in clinical
practice. In this study, inductively coupled plasma mass spectrometry (ICP-MS) was used to estimate Ca, Co, Cu, Fe, K, Mg, Mn,
Na, P, S, Se, and Zn in epithelial tubular cells (HK-2) and kidney tumor cells (Caki-1 cells). The most relevant difference was a
decrease in the contents of Ca, Cu, Fe, K, Mg, Mn, Na, P, S, and Zn. A significant accumulation of Co was also detected in Caki-1
cells. The fold change variation of each element concentration between HK-2 and Caki-1 cells was Ca (‒0.40), Co (1.37), Cu (‒0.68),
Fe (‒0.56), K (‒0.40), Mg (‒0.41), Mn (-0.54), Na (‒0.33), P (‒0.31), S (‒0.26), and Zn (‒0.73). These findings indicate that the
elements mainly affect the metabolic pathways of epithelial kidney cells. Thus, our findings open a new avenue for RCC target therapy
Palavras-Chave:
kidneys;
carcinomas;
elements;
transition elements;
icp mass spectroscopy;
transformations;
tumor cells;
lyophilization
BELLINI, MARIA H.; SOUZA, ALEXANDRE L. de; SILVA, FABIO F. da; GUILHEN, SABINE N.; FERREIRA, RAFAEL V. de P.; ARAUJO, LEANDRO G. de; OLIVEIRA, JOAO E. de; MARUMO, JULIO T.
Variations in essential elements after malignant transformation of kidney epithelial tubular cells.
Medical & Clinical Research,
v. 5,
n. 6,
p. 114-117,
2020.
DOI:
10.33140/MCR.05.06.04.
Disponível em: http://repositorio.ipen.br/handle/123456789/31420. Acesso em: $DATA.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.
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