Effects of zero-valent iron added in the flooding or drainage process on cadmium immobilization in an acid paddy soil

作     者：Hanbing Meng Shiwen Hu Zebin Hong Wenting Chi Guojun Chen Kuan Cheng QiWang Tongxu Liu Fangbai Li Kexue Liu Yang Yang Hanbing Meng;Shiwen Hu;Zebin Hong;Wenting Chi;Guojun Chen;Kuan Cheng;Qi Wang;Tongxu Liu;Fangbai Li;Kexue Liu;Yang Yang

作者机构：Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South ChinaGuangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China School of Resources and PlanningGuangzhou Xinhua UniversityGuangzhou 510310China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2024年第138卷第4期

页      面：19-31页

核心收录：

学科分类：12[管理学] 1204[管理学-公共管理] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 120405[管理学-土地资源管理] 

基　　金：supported by the National Natural Science Foundation of China(Nos.42277034 and 42207249) the Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110904) the Guangdong Academy of Sciences(GDAS)Project of Science and Technology Development(No.2022GDASZH-2022010105) the Guangdong Foundation for Program of Science and Technology Research(No.2020B1212060048) 

主　　题：Paddy soil Zero-valent iron Cadmium Flooding and drainage Remediation 

摘      要：Zero-valent iron(ZVI)is a promising material for the remediation of Cd-contaminated paddy ***,the effects of ZVI added during flooding or drainage processes on cadmium(Cd)retention remain ***,Cd-contaminated paddy soil was incubated for 40days of flooding and then for 15 days of drainage,and the underlying mechanisms of Cd immobilization coupled with Fe/S/N redox processes were *** addition of ZVI to the flooding process was more conducive to Cd *** potential available Cd was detected by adding ZVI before flooding,which may be due to the increase in paddy soil pH and newly formed secondary Fe ***,the reductive dissolution of Fe minerals promoted the release of soil colloids,thereby increasing significantly the surface sites and causing Cd ***,the addition of ZVI before flooding played a vital role in Cd retention after soil *** contrast,the addition of ZVI in the drainage phase was not conducive to Cd retention,which might be due to the rapid decrease in soil pH that inhibited Cd adsorption and further immobilization on soil *** findings of this study demonstrated that Cd availability in paddy soil was largely reduced by adding ZVI during the flooding period and provide a novel insight into the mechanisms of ZVI remediation in Cd-contaminated paddy soils.