Insights into the simultaneous removal of Cr6+ and Pb2+ by a novel sewage sludge-derived biochar immobilized nanoscale zero valent iron: Coexistence effect and mechanism
Diao, ZH; Du, JJ; Jiang, D; Kong, LJ; Huo, WY; Liu, CM; Wu, QH; Xu, XR; zenghuid86@scsio.ac.cn; xuxr@scsio.ac.cn
2018
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
卷号642页码:505-515
摘要Cr6+ and Pb2+ are both highly toxic pollutants and commonly co-exist in some industrial effluents and contaminated waters. In this study, simultaneous removal of Cr6+ and Pb2+ by a novel sewage sludge-derived biochar immobilized nanoscale zero-valent iron (SSB-nZVI) was systematically investigated. It was well demonstrated that a porous structure was successfully formed on the SSB nZVI when the starch was used as an additive. A synergistic effect on the adsorption and reduction over the SSB-nZVI was achieved, resulting in nearly 90 and 82% of Cr6+ and Pb2+ removal within 30 min, respectively. Cr6+ was reduced prior to Pb2+. A low pH could accelerate the corrosion of nZVI as well as phosphate leaching. When Malachite green was added as a coexisting organic pollutant, its effective removal was found due to the formation of a Fenton-like system. The SSB-nZVI could be run consecutively three times with a relatively satisfactory performance. Most of Cr6+ was converted into Cr2O3 and Cr(OH)(3) on the SSB nZVI surface, whereas most of Pb2+ species existed as Pb(OH)(2) (or PbO). A possible reaction mechanism on the SSB-nZVI involved the adsorption, reduction and precipitation of both Cr6+ and Pb2+ over the particles. Present study sheds light on the insight of the fate and transport of Cr6+ and Pb2+ in aquatic environment, as well provides helpful guide for the remediation of coexistence of pollutants in real applications. (C) 2018 Elsevier B.V. All rights reserved.
部门归属[Diao, Zeng-Hui; Huo, Wen-Yi; Liu, Cui-Mei; Xu, Xiang-Rong] Chinese Acad Sci, CAS Key Lab Trop Marine Bioresources & Ecol, Guangdong Prov Key Lab Appl Marine Biol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Diao, Zeng-Hui; Du, Jian-Jun] Zhongkai Univ Agr & Engn, Sch Environm Sci & Engn, Guangzhou 510225, Guangdong, Peoples R China; [Jiang, Dan] South China Normal Univ, Res Resources Ctr, Guangzhou 510631, Guangdong, Peoples R China; [Kong, Ling-Jun] Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China; [Wu, Qi-Hang] Guangzhou Univ, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Ctr Water Qual & Conservat Pearl River Delta, Guangzhou 510006, Guangdong, Peoples R China
学科领域Environmental Sciences & Ecology
关键词[WOS]nZVI ; Cr6+ ; Pb2+ ; Malachite green ; Sewage sludge-derived biochar
资助项目LMB
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/16911
专题中科院海洋生物资源可持续利用重点实验室
通讯作者zenghuid86@scsio.ac.cn; xuxr@scsio.ac.cn
推荐引用方式
GB/T 7714
Diao, ZH,Du, JJ,Jiang, D,et al. Insights into the simultaneous removal of Cr6+ and Pb2+ by a novel sewage sludge-derived biochar immobilized nanoscale zero valent iron: Coexistence effect and mechanism[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,642:505-515.
APA Diao, ZH.,Du, JJ.,Jiang, D.,Kong, LJ.,Huo, WY.,...&xuxr@scsio.ac.cn.(2018).Insights into the simultaneous removal of Cr6+ and Pb2+ by a novel sewage sludge-derived biochar immobilized nanoscale zero valent iron: Coexistence effect and mechanism.SCIENCE OF THE TOTAL ENVIRONMENT,642,505-515.
MLA Diao, ZH,et al."Insights into the simultaneous removal of Cr6+ and Pb2+ by a novel sewage sludge-derived biochar immobilized nanoscale zero valent iron: Coexistence effect and mechanism".SCIENCE OF THE TOTAL ENVIRONMENT 642(2018):505-515.
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