Simultaneous adsorption of As(Ⅲ) and Pb(Ⅱ) by the iron-sulfur codoped biochar composite:Competitive and synergistic effects  

作　　者：Yijun Chen Qintie Lin Xiaoqing Wen Jin He Haoyu Luo Quanfa Zhong Libin Wu Jiaqi Li 

机构地区：[1]Guangdong Industrial Contaminated Site Remediation Technology and Equipment,Engineering Research Center,School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,School of Environment and Energy,South China University of Technology,Guangzhou 510006,China [3]Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education,Institute of Environmental and Ecological Engineering,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Journal of Environmental Sciences》2023年第3期14-25,共12页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (No. 2018YFC1802803);the National Natural Science Foundation of China (No. 21677041);the Science and Technology Project of Guangzhou City, China (No. 202103000018)。

摘　　要：Simultaneous elimination of As(Ⅲ) and Pb(Ⅱ) from wastewater is still a great challenge.In this work,an iron-sulfur codoped biochar (Fe/S-BC) was successfully fabricated in a simplified way and was applied to the remediate the co-pollution of As(Ⅲ) and Pb(Ⅱ).The positive enthalpy indicated that the adsorption in As-Pb co-pollution was an endothermic reaction.The mechanism of As(Ⅲ) removal could be illustrated by surface complexation,oxidation and precipitation.In addition to precipitation and complexation,the elimination mechanism of Pb(Ⅱ) also contained ion exchange and electrostatic interactions.Competitive and synergistic effects existed simultaneously in the co-contamination system.The suppression of As(Ⅲ) was ascribed to competitive complexation of the two metals on Fe/S-BC,while the synergy of Pb(Ⅱ) was attributed to the formation of the PbFe2(AsO_(4))2(OH)2.Batch experiments revealed that Fe/S-BC had outstanding ability to remove As(Ⅲ) and Pb(Ⅱ),regardless of pH dependency and interference by various coexisting ions.The maximum adsorption capacities of the Fe/S-BC for As(Ⅲ) and Pb(Ⅱ) were 91.2 mg/g and 631.7 mg/g,respectively.Fe/S-BC could be treated as a novel candidate for the elimination of As(Ⅲ)-Pb(Ⅱ) combined pollution.

关 键 词：Iron-sulfur codoped BIOCHAR Arsenic and lead Co-contamination remediation 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]