Synthesis of a novel ternary HA/Fe-Mn oxides-loaded biochar composite and its application in cadmium(Ⅱ) and arsenic(Ⅴ) adsorption  

作　　者：Jianhua Guo Changzhou Yan Zhuanxi Luo Hongda Fang Shugang Hu Yinglan Cao 

机构地区：[1]Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China [2]University of Chinese Academy of Sciences, Beijing 100049, China [3]College of Food and Biological Engineering, Jimei University, Xiamen 361021, China [4]College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

出　　处：《Journal of Environmental Sciences》2019年第11期168-176,共9页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Project of China(No.2016YFD0800706);the Science and Technology Project of Fujian Province of China(No.2018Y0080);the Science and Technology Project of Xiamen(No.3502Z20172026)

摘　　要：Cadmium (Cd) and arsenic (As) are two of the most toxic elements.However,the chemical behaviors of these two elements are different,making it challenging to utilize a single adsorbent with high adsorption capacity for both Cd(Ⅱ) and As(Ⅴ) removal.To solve this problem,we synthesized HA/Fe-Mn oxides-loaded biochar (HFMB),a novel ternary material,to perform this task,wherein scanning electron microscopy (SEM) combined with EDS (SEM-EDS) was used to characterize its morphological and physicochemical properties.The maximum adsorption capacity of HFMB was 67.11 mg/g for Cd(Ⅱ) and 35.59 mg/g for As(Ⅴ),which is much higher compared to pristine biochar (11.06 mg/g,0 mg/g for Cd(Ⅱ) and As(Ⅴ),respectively).The adsorption characteristics were investigated by adsorption kinetics and the effects of the ionic strength and pH of solutions.X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR) revealed that chelation and deposition were the adsorption mechanisms that bound Cd(Ⅱ) to HFMB,while ligand exchange was the adsorption mechanism that bound As(Ⅴ).Cadmium(Cd) and arsenic(As) are two of the most toxic elements. However, the chemical behaviors of these two elements are different, making it challenging to utilize a single adsorbent with high adsorption capacity for both Cd(Ⅱ) and As(Ⅴ) removal. To solve this problem, we synthesized HA/Fe-Mn oxides-loaded biochar(HFMB), a novel ternary material,to perform this task, wherein scanning electron microscopy(SEM) combined with EDS(SEMEDS) was used to characterize its morphological and physicochemical properties. The maximum adsorption capacity of HFMB was 67.11 mg/g for Cd(Ⅱ) and 35.59 mg/g for As(Ⅴ),which is much higher compared to pristine biochar(11.06 mg/g, 0 mg/g for Cd(Ⅱ) and As(Ⅴ),respectively). The adsorption characteristics were investigated by adsorption kinetics and the effects of the ionic strength and pH of solutions. X-ray photoelectron spectroscopy(XPS)and Fourier-transform infrared spectroscopy(FT-IR) revealed that chelation and deposition were the adsorption mechanisms that bound Cd(Ⅱ) to HFMB, while ligand exchange was the adsorption mechanism that bound As(Ⅴ).

关 键 词：HUMIC acid FE-MN OXIDES BIOCHAR ADSORPTION Cd(Ⅱ) As(Ⅴ) 

分 类 号：O647.3[理学—物理化学] X703[理学—化学]