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An ecological new approach for treating Cr(VI)-containing industrial wastewater: Photochemical reduction
Liu, Jie1,2; Huang, Kun1; Xie, Keng1; Yang, Ying2; Liu, Huizhou1,2
2016-04-15
Source PublicationWATER RESEARCH
ISSN0043-1354
Volume93Issue:APRPages:187-194
AbstractAn ecological new approach for photochemical reduction of Cr(VI) in aqueous solution by adding into water-soluble copolymer, polyethylene glycol (PEG), was investigated. Various influences including light intensity, initial solution pH value, PEG molecular weight and initial concentration ratio of PEG to Cr(VI) on photochemical reduction of Cr(VI) were discussed, and a possible reaction mechanism was proposed. Experimental results revealed that Cr(VI) could be reduced to Cr(III) by PEG under sunlight irradiation. The photo-reduction rate of Cr(VI) increased with the decrease of solution pH and PEG molecular weight, but increased with the light intensity. The reduction percentage of Cr(VI) increased with the initial concentration ratio of PEG to Cr(VI). When the initial solution pH value was below 3.0, almost all of Cr(VI) was completely reduced to Cr(III) within 20 min of 50 x 10(3) lux solar irradiation in the presence of PEG. After photo-reduction, PEG and Cr(III) in aqueous solutions could be recovered by adding into a high concentrated Na2SO4 aqueous solution to induce the formation of a stable PEG-based aqueous biphasic system. By doing so, Na2SO4 in aqueous solution could also be removed. The present work highlights a promising new route for treating the industrial wastewater containing toxic Cr(VI) ions by adding into environmental-friendly PEG for photo-reduction of Cr(VI) to Cr(III), and then salting-out recovery of PEG and removal of Cr(III) in wastewater by adding into another high-salt wastewater, so that the high-salt wastewater could also be treated. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordCr(Vi) Photochemical Reduction Polyethylene Glycol Aqueous Two Phases Recovery
SubtypeArticle
WOS HeadingsScience & Technology ; Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1016/j.watres.2016.02.025
Indexed BySCI
Language英语
WOS KeywordHEXAVALENT CHROMIUM ; 3-LIQUID-PHASE EXTRACTION ; PHOTOCATALYTIC REDUCTION ; POLYETHYLENE-GLYCOL ; AQUEOUS-SOLUTIONS ; SILVER NANOPARTICLES ; GOLD NANOPARTICLES ; MODIFIED TITANIA ; CR(VI) ; MECHANISM
WOS Research AreaEngineering ; Environmental Sciences & Ecology ; Water Resources
WOS SubjectEngineering, Environmental ; Environmental Sciences ; Water Resources
Funding OrganizationNational Natural Science Foundation of China(51574213 ; Key Project of Chinese National Programs for Fundamental Research and Development (973 Program)(2013CB632602) ; 51074150)
WOS IDWOS:000372940200021
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/20970
Collection生化工程国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao 266101, Shandong, Peoples R China
Recommended Citation
GB/T 7714
Liu, Jie,Huang, Kun,Xie, Keng,et al. An ecological new approach for treating Cr(VI)-containing industrial wastewater: Photochemical reduction[J]. WATER RESEARCH,2016,93(APR):187-194.
APA Liu, Jie,Huang, Kun,Xie, Keng,Yang, Ying,&Liu, Huizhou.(2016).An ecological new approach for treating Cr(VI)-containing industrial wastewater: Photochemical reduction.WATER RESEARCH,93(APR),187-194.
MLA Liu, Jie,et al."An ecological new approach for treating Cr(VI)-containing industrial wastewater: Photochemical reduction".WATER RESEARCH 93.APR(2016):187-194.
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