Bioreduction of hexavalent chromium:Effect of compost-derived humic acids and hematite

作     者：Chao Yang Ming-Xia Zheng Yuan Zhang Bei-Dou Xi Zai-Feng Tian Xiao-Song He Chao Yang;Ming-Xia Zheng;Yuan Zhang;Bei-Dou Xi;Zai-Feng Tian;Xiao-Song He

作者机构：School of Environmental Science and EngineeringTianjin UniversityTianjin 300350China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater PollutionChinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Environmental Criteria and Risk AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China Hebei Engineering Research Center for Geographic Information ApplicationInstitute of Geographical SciencesHebei Academy of SciencesShijiazhuang 050030China Hebei Provincial Academy of Ecological and Environmental ScienceShijiazhuang 050037China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2020年第31卷第10期

页      面：2693-2697页

核心收录：

学科分类：12[管理学] 1204[管理学-公共管理] 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：the National Key Research and Development Program of China(No.2018YFC1800703) the National Water Pollution Control and Management Technology Major Project of China(No.2018ZX07110006) 

主　　题：Bioreduction Hexavalent chromium Composting Humic acids Hematite 

摘      要：Composting can enhance the nutrie nt ele ments cycling and reduce carbon dioxide ***,little information is available regarding the application of compost for the remediation of the contaminated *** this study,we assess the response of the redox capacities(electron accepting capacities(EAC)and electron donating capacities(EDC))of compost-derived humic acids(HAs)to the bioreduction of hexavalent chromium(Cr(Ⅵ)),especially in presence of *** result showed that the compost-derived HAs played an important role in the bioreduction of Cr(Ⅵ)in presence and absence of hematite under the anoxic,neutral(pH 7)and motionless *** on the pseudo-first order kinetic model,the rate constants of Cr(Ⅵ)reduction increased by 1.36-2.0 times when compost-derived HAs was *** redox capacity originating from the polysaccharide structure of compost-derived HAs made them effective in the direct Cr(Ⅵ)reduction(without MR-1)at pH ***,the reduction rates were inversely proportional to the composting treatment *** iron mineral(Fe_(2)O_(3))and compost-derived HAs were both present,the rate constants of Cr(Ⅵ)reduction increased by 2.35-5.09,which were higher than the rate of Cr(Ⅵ)reduction in HA-only systems,indicating that the hematite played a crucial role in the bioreduction process of Cr(Ⅵ).EAC and quinonoid structures played a major role in enhancing the bioreduction of Cr(Ⅵ)when iron mineral and compost-derived HAs coexisted in the *** results can extend the application fields of compost and will provide a new insight for the remediation of Cr(Ⅵ)-contaminated soil.