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Wei X, Zhang C, Gong D, Tu M, Wu L, Chen W, Zhang C. A Study on the Impermeability of Nanodispersible Modified Bentonite Based on Colloidal Osmotic Pressure Mechanisms and the Adsorption of Harmful Substances. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1840. [PMID: 37368270 DOI: 10.3390/nano13121840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 06/05/2023] [Accepted: 06/08/2023] [Indexed: 06/28/2023]
Abstract
With the growing demands of human beings, sanitary landfill, along with the increase in landfill depth and leachate water pressure, has put forward new and higher requirements for the impermeable layer. In particular, it is required to have a certain adsorption capacity of harmful substances from the perspective of environmental protection. Hence, the impermeability of polymer bentonite-sand mixtures (PBTS) at different water pressure and the adsorption properties of polymer bentonite (PBT) on contaminants were investigated through the modification of PBT using betaine compounded with sodium polyacrylate (SPA). It was found that the composite modification of betaine and SPA could reduce the average particle size of PBT dispersed in water (reduced to 106 nm from 201 nm) and enhance the swelling properties. As the content of SPA increased, the hydraulic conductivity of PBTS system decreases and the permeability resistance improves, while the resistance to external water pressure increases. It is proposed a concept of the potential of osmotic pressure in a constrained space to explain the impermeability mechanism of PBTS. The potential of osmotic pressure obtained by linear extrapolation of the trendline of colloidal osmotic pressure versus mass content of PBT could represent the external water pressure that the PBT resist. Additionally, the PBT also has a high adsorption capacity for both organic pollutants and heavy metal ions. The adsorption rate of PBT was up to 99.36% for phenol; up to 99.9% for methylene blue; and 99.89%, 99.9%, and 95.7% for low concentrations of Pb2+, Cd2+, and Hg+, respectively. This work is expected to provide strong technical support for the future development in the field of impermeability and removal of hazardous substances (organic and heavy metals).
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Affiliation(s)
- Xi Wei
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Chunyang Zhang
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Depeng Gong
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Mengdong Tu
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Lili Wu
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Wanyu Chen
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Chaocan Zhang
- School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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Efficient removal of uranium (VI) from aqueous solution by thiol-functionalized montmorillonite/nanoscale zero-valent iron composite. J Radioanal Nucl Chem 2023. [DOI: 10.1007/s10967-023-08847-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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3
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Sujathan S, Singh A. Investigation of Potential Drivers of Elevated Uranium Prevalence in Indian Groundwaters with a Unified Speciation Model. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:1970-1986. [PMID: 36693168 DOI: 10.1021/acs.est.2c08524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Elevated uranium (U) (>WHO limit of 30 μg L-1) in Indian groundwaters is primarily considered geogenic, but the specific mineralogical sources and mechanisms for U mobilization are poorly understood. In this contribution, statistical and geochemical analyses of well-constrained metadata of Indian groundwater quality (n = 342 of 8543) were performed to identify key parameters and processes that influence U concentrations. For geochemical predictions, a unified speciation model was developed from a carefully compiled and updated thermodynamic database of inorganic, organic (Stockholm Humic model), and surface complexation reactions and associated constants. Critical U contamination was found at shallow depths (<100 m) within the Indo-Gangetic plain, as determined by bivariate nonparametric Kendall's Taub and probability-based association tests. Analysis of aquifer redox states, multivariate hierarchical clusters, and principal components indicated that U contamination was predominant not just in oxic but mixed (oxic-anoxic) aquifers under high Fe, Mn, and SO4 concentrations, presumably due to U release from dissolution of Fe/Mn oxides or Fe sulfides and silicate weathering. Most groundwaters were undersaturated with respect to relevant U-bearing solids despite being supersaturated with respect to atmospheric CO2 (average pCO2 of reported dissolved inorganic carbonate (DIC) data = 10-1.57 atm). Yet, dissolved U did not appear to be mass limited, as predicted solubilities from reported sediment concentrations of U were ∼3 orders of magnitude higher. Integration of surface complexation models of U on typical aquifer adsorbents, ferrihydrite, goethite, and manganese dioxide, was necessary to explain dissolved U concentrations. Uranium contamination probabilities with increasing dissolved Ca and Mn exhibited minima at equilibrium solubilities of calcite [∼50 mg L-1] and rhodochrosite [∼0.14 mg L-1], respectively, at an average groundwater pH of ∼7.5. A potential indirect control of such U-free carbonate solids on U mobilization was suggested. For locations (n = 37) where dissolved organic carbon was also reported, organic complexes of U contributed negligibly to dominant U speciation at the groundwater pH. Overall, the unified model suggested competitive dissolution-precipitation and adsorption-desorption controls on U speciation. The model provides a quantitative framework that can be extended to understand dominant mobilization mechanisms of geogenic U in aquifers worldwide after suitable modifications to the relevant aquifer parameters.
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Affiliation(s)
- Surya Sujathan
- Department of Civil Engineering, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
| | - Abhas Singh
- Department of Civil Engineering, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
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4
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Ci Z, Yue Y, Xiao J, Huang X, Sun Y. Spectroscopic and modeling investigation of U(VI) removal mechanism on nanoscale zero-valent iron/clay composites. J Colloid Interface Sci 2023; 630:395-403. [DOI: 10.1016/j.jcis.2022.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 09/21/2022] [Accepted: 10/01/2022] [Indexed: 11/06/2022]
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5
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Thallium separation from wastewater using α-FeOOH@Biochar: Efficacy and mechanism. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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6
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Xiong T, Jia L, Li Q, Zhang Y, Zhu W. Efficient removal of uranium by hydroxyapatite modified kaolin aerogel. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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7
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Chen Z, Su M, Chen N, Liang D, Chen D. Effectiveness and mechanism of uranium adsorption on size-graded red mud. ENVIRONMENTAL RESEARCH 2022; 212:113491. [PMID: 35618003 DOI: 10.1016/j.envres.2022.113491] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 05/10/2022] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
As a type of useful solid waste, red mud (RM) should be reused to achieve waste-to-resource strategies. Additionally, the fast development of nuclear industry requires effective and reliable materials for treating uranium (U)-containing wastewater. This study attempted to remove uranyl ions [U(VI)] from mimic radioactive wastewater by various RM particles with different size fractions (e.g., >75, 45-75, 20-45, 10-20, 5-10, and <5-μm). Sorption data confirmed that the RM with a size fraction of <5-μm exhibited the largest adsorption capacity. The U removal behavior was favorably described by the pseudo-second-order model and Langmuir model. The mineral phases in the RM remarkably influenced U(VI) removal. Cancrinite, katoite, grossular, calcite, and calcium aluminum silicate phases made contributions to U(VI) adsorption. In addition, redox precipitation with iron-bearing minerals on RM surface also led to U(VI) adsorption. The findings of this work offer fundamental knowledge on the potential application of RM for clean-up of U(VI) from contaminated sites.
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Affiliation(s)
- Zheng Chen
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
| | - Minhua Su
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
| | - Nan Chen
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China.
| | - Dongyun Liang
- Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou, 510630, China
| | - Diyun Chen
- Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, Guangzhou University, Guangzhou, 510006, China; School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
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8
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Gandhi TP, Sampath PV, Maliyekkal SM. A critical review of uranium contamination in groundwater: Treatment and sludge disposal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 825:153947. [PMID: 35189244 DOI: 10.1016/j.scitotenv.2022.153947] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 01/24/2022] [Accepted: 02/13/2022] [Indexed: 06/14/2023]
Abstract
Dissolved uranium in groundwater at high concentrations is an emerging global threat to human and ecological health due to its radioactivity and chemical toxicity. Uranium can enter groundwater by geochemical reactions, natural deposition from minerals, mining, uranium ore processing, and spent fuel disposal. Although much progress has been made in uranium remediation in recent years, most published reviews on uranium treatment have focused on specific methods, particularly adsorption. This article systematically reviews the major treatment technologies, explains their mechanism and progress of uranium removal, and compares their performance under various environmental conditions. Of all treatment methods, adsorption has received much attention due to its ease of use and adaptability under various conditions. However, salinity and competition from other ions limit its application in actual field conditions. Biosorption and bioremediation are also promising methods due to their low-cost and chemical-free operation. Strong base anion exchange resins are more effective at typical groundwater pH conditions. Advanced oxidation processes like photocatalysis produce less sludge and are effective even at low uranium concentrations. Electrocoagulation shows significantly improved performance when organic ligands are added prior to treatment. The significant advantages of membrane filtration are high removal efficiency and the ability to recover uranium. While each technology has its merits and demerits, no single technology is entirely suitable under all conditions. One major area of concern with all technologies is the need to dispose of liquid and solid waste generated after treatment safely. Future research must focus on developing hybrid and state-of-the-art technologies for effective and sustainable uranium removal from groundwater. Developing holistic management strategies for uranium removal will hinge on understanding its speciation, mechanisms of fate and transport, and socio-economic conditions of the affected areas.
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Affiliation(s)
- T Pushparaj Gandhi
- Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu, 517619, India
| | - Prasanna Venkatesh Sampath
- Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu, 517619, India
| | - Shihabudheen M Maliyekkal
- Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu, 517619, India.
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Jiang Q, Zhao C, Han Z, Yang G, Qu N, Sun L, Li W, Wang M, Cheng Z. Amino-functionalized polyacrylonitrile/bentonite composite membranes for effective decontamination of Pb2+ and Congo Red. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120606] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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10
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A comparative investigation of uranium and thorium adsorption behavior on amidoximated copolymeric hydrogel. J Radioanal Nucl Chem 2022. [DOI: 10.1007/s10967-022-08250-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AbstractThis work focuses on investigating the feasibility of using a crosslinked amidoximated copolymeric hydrogel as a potential adsorbent to recover uranium and thorium ions from aqueous media. The hydrogel was synthesized via gamma-irradiation copolymerization and characterized through FTIR, TGA, and SEM. The medium acidity notably affected the adsorption capacity of both ions. The adsorption data was in line with the pseudo-1st-order equation and the Freundlich isothermal model. The thermodynamics analysis showed that the temperature rise promoted the adsorption capacity. The reusability studies highlighted the good performance of the hydrogel up to five regeneration rounds.
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11
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Ghasemi M, Sharifi M. Effects of layer-charge distribution on swelling behavior of mixed-layer illite-montmorillonite clays: A molecular dynamics simulation study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116188] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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12
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The effect of humic acid and competing cations Na+ and Ca2+ on the sorption of uranium and europium, onto bentonite from Kimolos Island (Greece). J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07722-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Zhao M, Cui Z, Pan D, Fan F, Tang J, Hu Y, Xu Y, Zhang P, Li P, Kong XY, Wu W. An Efficient Uranium Adsorption Magnetic Platform Based on Amidoxime-Functionalized Flower-like Fe 3O 4@TiO 2 Core-Shell Microspheres. ACS APPLIED MATERIALS & INTERFACES 2021; 13:17931-17939. [PMID: 33821605 DOI: 10.1021/acsami.1c00556] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Efficient removal of uranium (U) from aqueous solutions is crucial for ecological safety. Functionalized magnetic nanoparticles provide a promising strategy for radionuclide recovery and separation. However, designing and synthesizing magnetic adsorbents with high sorption capacity and selectivity, accompanied by excellent stability and reusability, remain a challenge. In this work, novel amidoxime-functionalized flower-like magnetic Fe3O4@TiO2 core-shell microspheres are designed and synthesized to efficiently remove U(VI) from aqueous solutions and actual seawater. The magnetic Fe3O4 core facilitates easy separation by an external magnetic field, and flower-like TiO2 nanosheets provide abundant specific surface areas and functionalization sites. The grafted amidoxime (AO) groups could function as a claw for catching uranium. The maximum adsorption capacity on U(VI) of the designed nanospheres reaches 313.6 mg·g-1 at pH 6.0, and the adsorption efficiency is maintained at 97% after 10 cycles. In addition, the excellent selectivity of the magnetic recyclable AO-functioning Fe3O4@TiO2 microspheres endows the potential of uranium extraction from seawater. The designed material provides an effective and applicable diagram for radioactive element elimination and enrichment.
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Affiliation(s)
- Min Zhao
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Zhenpeng Cui
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Duoqiang Pan
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Fuyou Fan
- Division of Ionizing Radiation, National Institute of Metrology, Beijing 100029, China
| | - Junhao Tang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Yameng Hu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Yang Xu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Pengcheng Zhang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Ping Li
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xiang-Yu Kong
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wangsuo Wu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
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14
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Cheng J, Leng Y, Gu R, Yang G, Wang Y, Tuo X. Adsorption of uranium(VI) from groundwater by amino-functionalized clay. J Radioanal Nucl Chem 2021. [DOI: 10.1007/s10967-021-07617-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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15
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Chen T, Da T, Ma Y. Reasonable calculation of the thermodynamic parameters from adsorption equilibrium constant. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114980] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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16
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New alginate-based interpenetrating polymer networks for water treatment: A response surface methodology based optimization study. Int J Biol Macromol 2020; 155:772-785. [PMID: 32234446 DOI: 10.1016/j.ijbiomac.2020.03.220] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 02/29/2020] [Accepted: 03/25/2020] [Indexed: 12/07/2022]
Abstract
Different interpenetrating polymeric networks (IPN) based on sodium alginate, carrageenan and bentonite were developed to remove heavy metals and dyes from contaminated water. Four significant preparation factors; crosslinking time, calcium chloride concentration, alginate to carrageenan mass ratio,and bentonite to carrageenan mass ratio were studied and optimized via full factorial design and response surface methodology to determine the optimum composition with highest adsorption capacity. Different optimal conditions and combinations were found depending on the type of heavy metal or dye to be removed. Low calcium chloride concentration was a common factor in all cases of heavy metals and dyes removal which indicates the negative effect of excessive crosslinking on the removal percentage. The adsorption capacity of methylene blue, Fe3+, Ni2+, and Cr3+ ions is 1271, 1550, 1500 and 1540 mg/g adsorbent, respectively. Reusability tests confirmed that the optimized formulations can be reused five successive times without significant drop in their removal efficiency. Upon utilization of the optimized formulations on real contaminated waters from tannery plant and oasis groundwater, they demonstrated an excellent performance as they removed above 95% of the original heavy metals contaminants and 40% of the acidic dye content.
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17
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Liu X, Hu S, Xu D, Shao D. Removal of U(VI) from aqueous solution using carboxymethyl cellulose-modified Ca-rectorite hybrid composites. KOREAN J CHEM ENG 2020. [DOI: 10.1007/s11814-020-0492-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Yousef LA, Bakry AR, Ahmad AA. Uranium(VI) Adsorption Using a Mixture of 1-Amino-2-naphthol-4-sulfonic Acid and Bentonite: Kinetic and Equilibrium Studies. RADIOCHEMISTRY 2020. [DOI: 10.1134/s1066362220040086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Lu W, Dai Z, Li L, Liu J, Wang S, Yang H, Cao C, Liu L, Chen T, Zhu B, Sun L, Chen L, Li H, Zhang P. Preparation of composite hydrogel (PCG) and its adsorption performance for uranium(VI). J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112604] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite. MINERALS 2019. [DOI: 10.3390/min9100626] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The sorption of uranium and thorium from their aqueous solutions by using 8-hydroxyquinoline modified Na-bentonite (HQ-bentonite) was investigated by the batch technique. Na-bentonite and HQ-bentonite were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared (FTIR) spectroscopy. Factors that influence the sorption of uranium and thorium onto HQ-bentonite such as solution pH, contact time, initial metal ions concentration, HQ-bentonite mass, and temperature were tested. Sorption experiments were expressed by Freundlich and Langmuir isotherms and the sorption results demonstrated that the sorption of uranium and thorium onto HQ-bentonite correlated better with the Langmuir isotherm than the Freundlich isotherm. Kinetics studies showed that the sorption followed the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° indicated that the sorption of uranium and thorium onto HQ-bentonite was endothermic, feasible, spontaneous, and physical in nature. The maximum adsorption capacities of HQ-bentonite were calculated from the Langmuir isotherm at 303 K and were found to be 63.90 and 65.44 for U(VI) and Th(IV) metal ions, respectively.
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21
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Aziman ES, Mohd Salehuddin AHJ, Ismail AF. Remediation of Thorium (IV) from Wastewater: Current Status and Way Forward. SEPARATION AND PURIFICATION REVIEWS 2019. [DOI: 10.1080/15422119.2019.1639519] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Eli Syafiqah Aziman
- Nuclear Science Programme, Faculty of Science and Technology, Universiti Kebangsaan, Bangi, Malaysia
| | | | - Aznan Fazli Ismail
- Nuclear Science Programme, Faculty of Science and Technology, Universiti Kebangsaan, Bangi, Malaysia
- Centre for Frontier Sciences, Faculty of Science and Technology, Universiti Kebangsaan, Bangi, Malaysia
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22
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Alhumaimess MS, Alsohaimi IH, Alqadami AA, Khan MA, Kamel MM, Aldosari O, Siddiqui MR, Hamedelniel AE. Recyclable glutaraldehyde cross-linked polymeric tannin to sequester hexavalent uranium from aqueous solution. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Soliman MA, Rashad GM, Mahmoud MR. Organo-modification of montmorillonite for enhancing the adsorption efficiency of cobalt radionuclides from aqueous solutions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:10398-10413. [PMID: 30767104 DOI: 10.1007/s11356-019-04478-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 02/04/2019] [Indexed: 06/09/2023]
Abstract
Montmorillonite clay was organically modified with thoron (TH) and was employed as an adsorbent for removal of cobalt(II) radionuclides from aqueous solutions. Batch adsorption experiments, under several operational parameters such as pH, contact time, initial adsorbate concentration, adsorbent dosage, ionic strength, and temperature, were conducted to determine the optimum conditions for efficient removal of cobalt(II) radionuclides. The obtained data showed that almost complete removals were achieved for cobalt(II) at pH values ≥ 3.5 using TH-modified montmorillonite (TMM), while only 63% were obtained by unmodified clay at pH ≥ 5.4. Adsorption kinetic data of cobalt(II) were better fitted by the pseudo-second order kinetic model and its adsorption rate was controlled by film diffusion. Both Langmuir and Freundlich models had the ability to well describe the equilibrium data of cobalt(II) radionuclides at the studied temperatures. The adsorption capacity of TMM (0.85 mmol/g) was found to be not only nine times that of unmodified montmorillonite (0.097 mmol/g), but also higher than those reported in literature using various unmodified and modified clays. Thermodynamic parameters (ΔH°, ΔS°, and ΔG°) were calculated. Among the examined desorbing agents, both Al3+ and EDTA were succeeded to desorb most of cobalt(II) radionuclides (desorption % ~ 90%) loaded onto TMM. The results of this study clarified that TMM can be considered as an effective adsorbent for removal of cobalt(II) radionuclides from aqueous solutions.
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Affiliation(s)
- Mohamed A Soliman
- Egypt Second Research Reactor, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
| | - Ghada M Rashad
- Nuclear Chemistry Department, Hot Laboratories Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
| | - Mamdoh R Mahmoud
- Nuclear Chemistry Department, Hot Laboratories Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt.
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A synergistic biosorption and biomineralization strategy for Kocuria sp. to immobilizing U(VI) from aqueous solution. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.11.079] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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25
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Wang J, He B, Wei X, Li P, Liang J, Qiang S, Fan Q, Wu W. Sorption of uranyl ions on TiO 2: Effects of pH, contact time, ionic strength, temperature and HA. J Environ Sci (China) 2019; 75:115-123. [PMID: 30473276 DOI: 10.1016/j.jes.2018.03.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 03/09/2018] [Accepted: 03/12/2018] [Indexed: 06/09/2023]
Abstract
Sorption of U(VI) onto TiO2 as functions of pH, ionic strength, contact time, soil humic acid (SHA), solid-to-liquid ratio and temperature was studied under ambient conditions using batch and spectroscopic approaches. The sorption of U(VI) on TiO2 was significantly dependent on pH and ionic strength. The presence of SHA slightly enhanced the sorption of U(VI) on TiO2 below pH4.0, while it inhibited U(VI) sorption in the higher pH range. U(VI) sorption on TiO2 was favored at high temperatures, and the sorption process was estimated to be endothermic and spontaneous. Reduction of U(VI) to lower valent species was confirmed by X-ray photo-electron spectroscopy analysis. It is very interesting to find that U(VI) sorption on TiO2 was promoted in solutions with higher back-ground electrolyte concentrations. In the presence of U(VI), higher back-ground electrolyte made more TiO2 particles aggregate through (001) facets, leading more (101) facets to be exposed. Therefore, the reduction of U(VI) was enhanced by the exposed (101) facets and more U(VI) removal was observed.
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Affiliation(s)
- Jingjing Wang
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Bihong He
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xiaoyan Wei
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Ping Li
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Jianjun Liang
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Shirong Qiang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Qiaohui Fan
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Wangsuo Wu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
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Rostamian R, Amiri N, Behnejad H. How does graphene nanosheet affect the pharmaceutical adsorption? A comprehensive insight from molecular dynamics simulation, quantum mechanics and experimental study. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.07.102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Abstract
Abstract
Diatomite was modified with TiO2. The synthesized materials were characterized and used for removal of U(VI) from aqueous solutions. The influences of pH, contact time and temperature on U(VI) adsorption onto TiO2@diatomite were studied by batch technique, and X-ray photoelectron spectroscopy (XPS) was employed to analyze the experimental data. We compared the adsorption of U(VI) onto natural diatomite, TiO2 and TiO2@diatomite made by sol-gel method. The dynamic process showed that the adsorption of U(VI) onto TiO2@diatomite matched the pseudo-second-order kinetics model, and the adsorption of U(VI) was significantly dependent on pH values. Through simulating the adsorption isotherms by Langmuir, Freundlich and Dubini–Radushkevich (D–R) models, respectively, it could be seen that the adsorption patterns of U(VI) onto TiO2@diatomite were mainly controlled by surface complexation, and the adsorption processes were endothermic and spontaneous. The modification of diatomite by TiO2 shows a novel material for removing U(VI) from water environment for industrialized application.
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Affiliation(s)
- Ni Yuan
- Radiochemistry Laboratory , Lanzhou University , Lanzhou 730000 , China
| | - Peng Liu
- Radiochemistry Laboratory , Lanzhou University , Lanzhou 730000 , China
| | - Wangsuo Wu
- Radiochemistry Laboratory , Lanzhou University , Lanzhou 730000 , China
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Yin L, Song S, Wang X, Niu F, Ma R, Yu S, Wen T, Chen Y, Hayat T, Alsaedi A, Wang X. Rationally designed core-shell and yolk-shell magnetic titanate nanosheets for efficient U(VI) adsorption performance. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 238:725-738. [PMID: 29625297 DOI: 10.1016/j.envpol.2018.03.092] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 03/11/2018] [Accepted: 03/25/2018] [Indexed: 06/08/2023]
Abstract
The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (Fe3O4@TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic Fe3O4@TNS nanosheets had high specific areas (114.9 m2 g-1 for core-shell Fe3O4@TNS and 130.1 m2 g-1 for yolk-shell Fe3O4@TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment. The sorption was strongly affected by pH values and weakly influenced by ionic strength, suggesting that the sorption of U(VI) on Fe3O4@TNS was mainly dominated by ion exchange and outer-sphere surface complexion. The maximum sorption capacities (Qmax) calculated from the Langmuir model were 68.59, 121.36 and 264.55 mg g-1 for core-shell Fe3O4@TNS and 82.85, 173.01 and 283.29 mg g-1 for yolk-shell Fe3O4@TNS, at 298 K, 313 K and 328 K, respectively. Thermodynamic parameters (ΔH0, ΔS0 and ΔG0) demonstrated that the sorption process was endothermic and spontaneous. Based on X-ray photoelectron spectroscopy (XPS) analyses, the sorption mechanism was confirmed to be cation-exchange between interlayered Na+ and UO22+. The yolk-shell Fe3O4@TNS had more extraordinary sorption efficiency than core-shell Fe3O4@TNS since the yolk-shell structure provided internal void space inside the titanate shell to accommodate more exchangeable active sites. The flexible recollection and high efficient sorption capacity made core-shell and yolk-shell Fe3O4@TNS nanosheets promising materials to eliminate U(VI) or other actinides in wastewater cleanup applications.
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Affiliation(s)
- Ling Yin
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Shuang Song
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Xiangxue Wang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Fenglei Niu
- School of Nuclear Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Ran Ma
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Shujun Yu
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Tao Wen
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Yuantao Chen
- Department of Chemistry, Qinghai Normal University, 810008, Xining, Qinghai, PR China
| | - Tasawar Hayat
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Ahmed Alsaedi
- NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Xiangke Wang
- College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China; NAAM Research Group, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, School for Radiological and Interdisciplinary Sciences, Soochow University, Suzhou, 215123, PR China.
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