Adsorption of uranium by hydrous manganese dioxide from aqueous solution

Yang, Chao; Niu, Deqing; Zhong, Yilong; Li, Lei; Lv, Huanzhu; Liu, Yang

doi:10.1007/s10967-018-5705-8

Cited by 20 publications

(6 citation statements)

References 46 publications

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“…Concentrating U(VI) in nuclear power plant wastewater has become the most important problem in radioactive wastewater treatment worldwide, and it is also the most critical issue for the public in the process of nuclear power application and development. 73 In 2017, Yang et al's 74 experiments proved that the formation of the inner sphere surface complex made the maximum amount of U(VI) adsorbed by hydrous manganese dioxide (HMO) reach 68.35 mg/g (Figure 6a). The adsorption rate was fully attractive; 80% U(VI) could be fixed in 5 min (Figure 6b).…”

Section: ■ Modification Methodsmentioning

confidence: 99%

“…In 2017, Yang et al’s experiments proved that the formation of the inner sphere surface complex made the maximum amount of U(VI) adsorbed by hydrous manganese dioxide (HMO) reach 68.35 mg/g (Figure a). The adsorption rate was fully attractive; 80% U(VI) could be fixed in 5 min (Figure b).…”

Section: Radionuclide Removal By Mno2-based Nanomaterialsmentioning

confidence: 99%

“…(a) Sorption isotherms and (b) sorption kinetic curve of U(VI) on HMO. Reprinted with permission from Yang et al Copyright 2018 Springer International Publishing. (c) Surface complexation modeling of U(VI) on MnO 2 .…”

Section: Radionuclide Removal By Mno2-based Nanomaterialsmentioning

confidence: 99%

“…(a) Pseudo-first-order kinetics, (b) pseudo-second-order kinetics, (c) intraparticle diffusion, and (d) Elovich models for adsorption of U(VI). Reprinted with permission from Yang et al Copyright 2018 Springer International Publishing. (e) Zeta potential of materials.…”

Section: Effects Of Environmental Conditionsmentioning

confidence: 99%

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Removal of Radionuclides from Aqueous Solution by Manganese Dioxide-Based Nanomaterials and Mechanism Research: A Review

Wang

et al. 2021

ACS EST Eng.

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Manganese dioxide (MnO 2 ) is an environmentally friendly metal oxide. The characteristics of diverse morphology, rich crystal forms, and controllable particle size make MnO 2 flexibly adaptive to multiple requirements, attracting researchers in multidisciplinary fields. It is worth noting that MnO 2 and its derived materials have shown outstanding research progress in the treatment of radioactive pollutants in the past few decades. Given the need to summarize the research advances, this reivew surveys the achievements of MnO 2 -based nanomaterials in radioactive ion removal. The preparation and modification methods of MnO 2 , the application of MnO 2 -based materials in removing radionuclides, and the exploration of potential adsorption mechanisms will be carefully discussed. Finally, the research trends are summarized and an outlook is presented, aiming at providing reference for further design and synthesis of MnO 2 -based nanomaterials with practical application value for removal of radionuclides.

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Section: ■ Modification Methodsmentioning

confidence: 99%

Section: Radionuclide Removal By Mno2-based Nanomaterialsmentioning

confidence: 99%

Section: Radionuclide Removal By Mno2-based Nanomaterialsmentioning

confidence: 99%

Section: Effects Of Environmental Conditionsmentioning

confidence: 99%

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Removal of Radionuclides from Aqueous Solution by Manganese Dioxide-Based Nanomaterials and Mechanism Research: A Review

Wang

et al. 2021

ACS EST Eng.

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“…Hexavalent uranium can generally exist in water ecosystems as uranyl cation (UO 2 2+ ) which has been proposed to be the main species responsible for uranium toxicity [16,17], and it can be reduced to U 4+ [18]. The maximum hexavalent uranium content in drinking waters and spring waters should be less than 20-30 µg/L, fixed by the World Health Organization [19]. Therefore, from the point of human health, energy security, resource recovery and environmental protection, it is very important to remove hexavalent uranium from aqueous solutions and wastewater to permissible limits.…”

Section: Introductionmentioning

confidence: 99%

Artificial neural network modeling of the hexavalent uranium sorption onto chemically activated bentonite

Achour

Amokrane

Chegrouche³

et al. 2021

Res Chem Intermed

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This study aims to study the hexavalent uranium U(VI) adsorption onto chemically activated Algerian bentonite BMP-Na in order to guarantee a clean and environmentally friendly method of the elimination of waste in nuclear energy applications. The activation of the bentonite was done chemically using hydrochloric acid HCl and saturated with Na + cations using NaCl solution. The obtained bentonite has been characterized by using various methods such as XRD, SEM-EDX, FTIR, XRF and BET. Those characterizations have shown that the activation of bentonite has led to a significant increase in the surface area of the bentonite from 17.19 to 83.06 m 2 /g, which can improve its efficiency in the adsorption application. After characterization, the activated bentonite was subjected to the U(VI) adsorption application. An artificial neural network (ANN) method was used to model and optimize the U(VI) adsorption. Experiments at various pH levels, different absorbent doses and uranium (VI) initial concentrations were done and then, used to train the ANN network. The network was optimized by measuring the mean square error (MSE) with various numbers of neurons in the hidden layer. The optimal number of neurons on the hidden layer was discovered to be 12 neurons, which provided the highest coefficient of correlation R 2 of 0.991. The ANN model's predictions matched very well with the experimental results. The optimization after modelization has shown that the optimal conditions for uranium adsorption are pH = 5.6, initial concentration of 67 mg/L and adsorbent dose of 5 g/L with a complete adsorption rate within only 6 h. Finally, to determine the relative importance of the various operating inputs, a Garson formula was established and the pH of the solution was found to be the most influential parameter.

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Adsorption of U(IV) by several geomaterials: kinetic, adsorbent dosage and thermodynamic

Jiménez‐Reyes

Solache‐Ríos

2018

J Radioanal Nucl Chem

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Adsorption of uranium by hydrous manganese dioxide from aqueous solution

Cited by 20 publications

References 46 publications

Removal of Radionuclides from Aqueous Solution by Manganese Dioxide-Based Nanomaterials and Mechanism Research: A Review

Removal of Radionuclides from Aqueous Solution by Manganese Dioxide-Based Nanomaterials and Mechanism Research: A Review

Artificial neural network modeling of the hexavalent uranium sorption onto chemically activated bentonite

Adsorption of U(IV) by several geomaterials: kinetic, adsorbent dosage and thermodynamic

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