A porous biochar supported nanoscale zero-valent iron material highly efficient for the simultaneous remediation of cadmium and lead contaminated soil  

作　　者：Wei Qian Jing-Yi Liang Wen-Xuan Zhang Shi-Ting Huang Zeng-Hui Diao 

机构地区：[1]Guangdong Provincial Engineering and Technology Research Center for Agricultural Land Pollution Prevention and Control,Zhongkai University of Agriculture and Engineering,Guangzhou 510225,China

出　　处：《Journal of Environmental Sciences》2022年第3期231-241,共11页环境科学学报（英文版）

基　　金：supported by the Special project in key areas of Guangdong Province Ordinary Universities (No. 2020ZDZX1003);the Guangdong Provincial Key R&D Programme (No. 2020B1111350002);the Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2018);the research project and development plan for key areas of Guangdong Province (No. 2020B0202080002);the Project of Educational Commission of Guangdong Province of China (No. 2019KTSCX067);the Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams (No. 2019KJ140);the National Natural Science Foundation of China (No. 21407155).

摘　　要：Risk associated with heavy metals in soil has been received widespread attention.In this study,a porous biochar supported nanoscale zero-valent iron(BC-nZVI)was applied to immobilize cadmium(Cd)and lead(Pb)in clayey soil.Experiment results indicated that the immobilization of Cd or Pb by BC-nZVI process was better than that of BC or nZVI process,and about 80%of heavy metals immobilization was obtained in BC-nZVI process.Addition of BC-nZVI could increase soil pH and organic matter(SOM).Cd or Pb immobilization was inhibited with coexisting organic compound 2,4-dichlorophenol(2,4-DCP),but 2,4-DCP could be removed in a simultaneous manner with Cd or Pb immobilization at low concentration levels.Simultaneous immobilization of Cd and Pb was achieved in BC-nZVI process,and both Cd and Pb availability significantly decreased.Stable Cd species inculding Cd(OH)_(2),CdCO_(3)and CdO were formed,whereas stable Pb species such as PbCO_(3),PbO and Pb(OH)_(2)were produced with BC-nZVI treatment.Simultaneous immobilization mechanism of Cd and Pb in soil by BC-nZVI was thereby proposed.This study well demonstrates that BC-nZVI has been emerged as a potential technology for the remediation of multiple heavy metals in soil.

关 键 词：Cadmium(Cd) Lead(Pb) BIOCHAR Nano zero valent iron(nZVI) Contaminated soil 

分 类 号：X53[环境科学与工程—环境工程] TQ138.11[化学工程—无机化工]