Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 4, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.105681
Keywords
Uranium adsorption; Luffa cylindrica; Modified fiber; Regeneration; Mechanism
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Funding
- Sichuan Science and Technology Program [2019YFG0321]
- State Key Laboratory of Solid Waste Reuse for Building Materials of China [SWR-2016-005]
- Longshan Academic Talent Research Supporting Program of Southwest University of Science and Technology [18LZX322]
- International Science and Technology Cooperation Laboratory of Micronanoparticle Application Research of Southwest University of Science and Technology [19MNA001]
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A novel luffa cylindrica adsorbent modified with carboxyl and amidoxime groups was successfully prepared and demonstrated effective U(VI) uptake. The adsorbent showed outstanding performance under optimal conditions and could be efficiently regenerated for repeated use.
Novel luffa cylindrica adsorbent modified with carboxyl and amidoxime groups is successfully prepared by a simple water bath method for effective U(VI) uptake from uranium-containing wastewater and real uranium mine water. The critical factors affecting U(VI) adsorption are explored, such as grafting time of carboxyl and amidoxime groups, solution pH, initial concentration of U(VI) and contact time. The results show that LC-CA(2)-AO(4) obtained under optimal condition possesses outstanding adsorption performance to U(VI) (q(max), 399.1 mg g(-1)). Repeated adsorption/desorption experiments display that LC-CA(2)-AO(4) can be efficiently regenerated by 0.50 mol L-1 HCl solution and reused for uranium adsorption. Adsorption capacity and desorption efficiency of LC-CA(2)-AO(4) to U(VI) drop slightly after eight cycles of regeneration test. The accordance of kinetic data with pseudo-second-order kinetics model suggests that the adsorption reaction is controlled by chemical process. Moreover, LC-CA(2)-AO(4) displays high removal rate to U(VI) in real uranium mine water. Based on this work, it is demonstrated that LC-CA(2)-AO(4) would be a promising candidate for potential application in field of uranium adsorption.
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