Immobilization and transformation of co-existing arsenic and antimony in highly contaminated sediment by nano zero-valent iron  

作　　者：Jianlong Guo Zhipeng Yin Wen Zhong Chuanyong Jing 

机构地区：[1]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Environmental Science and Engineering,Shandong University,Qingdao 266237,China

出　　处：《Journal of Environmental Sciences》2022年第2期152-160,共9页环境科学学报（英文版）

基　　金：financial This work was supported by the National Key Basic Research Program of China(No.2020YFC1807800);the National Natural Science Foundation of China(Nos,41877378 and 42077299);the Major Program of Shandong Natural Science Foundation,China(No.ZR2020ZD34)。

摘　　要：Arsenic(As)and antimony(Sb)are usually coexistent in mine wastes and pose a great threat to human health.The As immobilization by nano zero-valent iron(n ZVI)is promising,however,the stabilization for co-occurring As and Sb is not known.Herein,the immobilization and transformation of As and Sb in n ZVI-treated sediments were evaluated using complementary leaching experiments and characterization techniques.Raw sediment samples from a gold-antimony deposit revealed the co-existence of ultrahigh As and Sb at 50.3 and 14.9 g/kg,respectively.Leaching results show that As was more efficiently stabilized by n ZVI than Sb,which was primarily due to the soluble fraction that was readily absorbed by n ZVI of As was higher.As the n ZVI treatment proceeds,the oxidation and reduction of As and Sb occur simultaneously as evidenced by XPS analysis.The primary oxidant,hydroxyl radicals,was detected by EPR studies,proving the occurrence of n ZVI induced Fenton reaction.This study sheds light on differences in the interaction and immobilization of n ZVI with Sb and As in co-contaminated sediments.

关 键 词：ARSENIC ANTIMONY Nano zero-valent iron IMMOBILIZATION TRANSFORMATION LEACHING 

分 类 号：X751[环境科学与工程—环境工程]