Recovery of phosphorus rich krill shell biowaste for uranium immobilization: A study of sorption behavior, surface reaction, and phase transformation. (December 2018)

• Record Type: Journal Article
• Authors: Kong, Lingjun; Zhang, Huimin; Ji, Wei; Shih, Kaimin; Su, Minhua; Diao, Zenghui; Xu, Ruimei; Hou, Li'an; Song, Gang; Chen, Diyun
• Is Part Of: Environmental pollution. Volume 243(2018)Part A
• Page Start: 630
• Page End: 636
• Publication Date: 2018-12
• Subjects: Chemisorption -- Krill shell -- Uranium (VI) -- Phosphate -- Waste resource; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2018.08.023
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: Increased generation of shrimp shell from exploitation of krill results in emerging biowaste pollution, in addition, uranium pollution has drawn public concern due to the rapid development of nuclear power, uranium mining, and nuclear fuel processing. In this study, krill shells were recovered and used as a potential natural biosorbent for uranium immobilization, thereby enabling both uranium decontamination and krill shell reutilization. Interaction of uranium with krill shell surface and their transformation were investigated by using batch sorption experiments, scanning electron microscopy, and transmission electron microscopy. Krill shell had high uranium sorption ability. Uranium was transformed into a nano-scale precipitate. The mapping of phosphorus and uranium was related to the nano-scale precipitate, indicating that sorption of uranium was dependent on phosphorus. Surface chemisorption between phosphate in krill shell and uranium as well as the formation of the nano-scale precipitate were interpreted as the mechanism of uranium immobilization. Thus, natural krill shell waste has potential for extensive use as a promising and cost-effective sorbent for uranium immobilization and krill shell reutilization. Graphical abstract: Image 1 Highlights: Resource of krill shell as a biosorbent for favorable immobilizing uranium. TEM-mapping and SEM-mapping analysis confirm the U and P element related mapping. Formation of nano-scale precipitation contributes to uranium transformation. Ca2 (UO2 )3 (PO4 )2 (OH)4 H2 O is regarded as the precipitation for immobilizing uranium.