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Chen X, Wang Y, Xia H, Ren Q, Li Y, Xu L, Xie C, Wang Y. "One-can" strategy for the synthesis of hydrothermal biochar modified with phosphate groups and efficient removal of uranium(VI). JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2023; 263:107182. [PMID: 37094506 DOI: 10.1016/j.jenvrad.2023.107182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 03/08/2023] [Accepted: 04/10/2023] [Indexed: 05/03/2023]
Abstract
Significant selectivity, reasonable surface modification and increased structural porosity were three key factors to improve the competitiveness of biochar in the adsorption field. In this study, a hydrothermal bamboo-derived biochar modified with phosphate groups (HPBC) was synthesized using "one-can" strategy. BET showed that this method could effectively increase the specific surface area (137.32 m2 g-1) and simulation of wastewater experiments indicated HPBC had an excellent selectivity for U(VI) (70.35%), which was conducive to removal of U(VI) in real and complex environments. The accurate matchings of pseudo-second-order kinetic model, thermodynamic model and Langmuir isotherm showed that at 298 K, pH = 4.0, the adsorption process dominated by chemical complexation and monolayer adsorption was spontaneous, endothermic and disordered. Saturated adsorption capacity of HPBC could reach 781.02 mg g-1 within 2 h. The introduction of phosphoric acid and citric acid by "one-can" method not only provided abundant -PO4 to assist adsorption, but also activated oxygen-containing groups on the surface of the bamboo matrix. Results showed that adsorption mechanism of U(VI) by HPBC included electrostatic action and chemical complexation involving P-O, PO and ample oxygen-containing functional groups. Therefore, HPBC with high phosphorus content, outstanding adsorption performance, excellent regeneration, remarkable selectivity and green value provided a novel solution for the field of radioactive wastewater treatment.
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Affiliation(s)
- Xinchen Chen
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Yang Wang
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Hongtao Xia
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Qi Ren
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Yang Li
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China
| | - Lejin Xu
- School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China
| | - Chuting Xie
- School of Architecture & Urban Planning, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China
| | - Yun Wang
- School of Nuclear Science and Engineering, East China University of Technology, Nanchang, 330013, Jiangxi, China.
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Chen X, Wang Y, Lv J, Feng Z, Liu Y, Xia H, Li Y, Wang C, Zeng K, Liu Y, Yuan D. Simple one-pot synthesis of manganese dioxide modified bamboo-derived biochar composite for uranium(VI) removal. NEW J CHEM 2022. [DOI: 10.1039/d2nj02292c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Exploitation of bamboo-derived biochar offers a lucrative opportunity for using moso bamboo due to its short growth cycle, large quantity and universality. Novel MnO2 modified bamboo-derived biochar composites (MnO2@BBC) were...
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Ouyang Y, Xu Y, Zhao L, Deng M, Yang P, Peng G, Ke G. Preparation of ZnNiAl-LDHs microspheres and their adsorption behavior and mechanism on U(VI). Sci Rep 2021; 11:21625. [PMID: 34732804 PMCID: PMC8566569 DOI: 10.1038/s41598-021-01133-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Accepted: 10/22/2021] [Indexed: 11/09/2022] Open
Abstract
Ternary zinc-nickel-aluminum hydrotalcites (ZnNiAl-LDHs) were prepared by hydrothermal synthesis. The structure and morphology of the materials were characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption-desorption (BET) and other test techniques. ZnNiAl-LDHs was applied in the treatment of uranium-containing wastewater, the effects of initial pH of the solution, adsorption temperature and contact time on its adsorption performance were systematically investigated, and the adsorption performance of ZnNiAl-LDHs and ZnAl-LDHs on uranyl ions were compared. The result showed that ZnNiAl-LDHs were 3D microspheres self-assembled from flakes, with a specific surface area of 102.02 m2/g, which was much larger than that of flake ZnAl-LDHs (18.49 m2/g), and the saturation adsorption capacity of ZnNiAl-LDHs for uranyl ions (278.26 mg/g) was much higher than that of ZnAl-LDHs for uranyl ions (189.16 mg/g), so the ternary ZnNiAl-LDHs had a more excellent adsorption capacity. In addition, kinetic and thermodynamic studies showed that the adsorption process of ZnNiAl-LDHs on uranyl ions conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. The positive value of ΔH and the negative value of ΔG indicated that the adsorption process was endothermic and spontaneous. The adsorption mechanism was analyzed by X-ray energy spectroscopy (EDS), fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results showed that the adsorption of uranyl ions by ZnNiAl-LDHs mainly consisted of complexation and ion substitution. The research results prove that ZnNiAl-LDHs is an adsorbent with low cost and excellent performance, and it has a good application prospect in the field of uranium-containing wastewater treatment.
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Affiliation(s)
- Yanquan Ouyang
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China.,Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, 421001, China
| | - Yuanxin Xu
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China.,Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, 421001, China
| | - Limei Zhao
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China.,Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, 421001, China
| | - Mingzhan Deng
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China.,Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, 421001, China
| | - Pengfei Yang
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China. .,Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, 421001, China. .,China Nuclear Construction Key Laboratory of High Performance Concrete, University of South China, Hengyang, 421001, China.
| | - Guowen Peng
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China.,Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang, 421001, China
| | - Guojun Ke
- China Nuclear Construction Key Laboratory of High Performance Concrete, University of South China, Hengyang, 421001, China.,Hunan Provincial Key Laboratory of High Performance Special Concrete, University of South China, Hengyang, 421001, China
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