title: Simultaneous reduction and adsorption for immobilization of uranium from aqueous solution by nano-flake Fe-SC.
abstract: Uranium containing radioactive wastewater is seriously hazardous to the natural environment if it is being discharged directly. Herein, nano-flake like Fe loaded sludge carbon (Fe-SC) is synthesized by carbothermal process from Fe-rich sludge waste and applied in the immobilization of uranium in aqueous. Batch isotherm and kinetic adsorption experiments are adopted to investigate the adsorption behavior of Fe-SC to uranium in aqueous. XPS analyses were conducted to evaluate the immobilized mechanism. It was found that the carbonized temperature played significant role in the characteristics and immobilization ability of the resulted Fe-SC. The Fe-SC-800 carbonized at 800°C takes more advantageous ability in immobilization of uranium from aqueous than the commercial available AC and powder zero valent iron. The adsorption behavior could be fitted well with the Langmuir isotherm adsorption model and pseudo-second order model. The equilibrium adsorption amount and rate for Fe-SC-800 is high to 148.99mgg-1and 0.015gmg-1min-1, respectively. Both reductive precipitation and physical adsorption are the main mechanisms of immobilization of uranium from aqueous by Fe-SC-800.
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, 510275, PR China. Electronic address: kongl_jun@163.com.
authors: Lingjun
authors: L
authors: Kong
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Yuting
authors: Y
authors: Zhu
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Min
authors: M
authors: Wang
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Zhixuan
authors: Z
authors: Li
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Zhicong
authors: Z
authors: Tan
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Ruibin
authors: R
authors: Xu
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Hongmei
authors: H
authors: Tang
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China.
authors: Xiangyang
authors: X
authors: Chang
authors: Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, 510275, PR China.
authors: Ya
authors: Y
authors: Xiong
authors: School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of radioactive contamination control and resources, Guangzhou University, Guangzhou, 510275, PR China. Electronic address: cdy@gzhu.edu.cn.
authors: Diyun
authors: D
authors: Chen
keywords: Adsorption; Fe-SC-800; Reductive precipitation; Sludge; Uranium immobilization