Decontamination of 1, 2-dichloroethane DNAPL in contaminated groundwater by polymer-modified zero-valent iron nanoparticles
學年 107
學期 1
出版（發表）日期 2018-09-06
作品名稱 Decontamination of 1, 2-dichloroethane DNAPL in contaminated groundwater by polymer-modified zero-valent iron nanoparticles
作品名稱（其他語言）
著者 Ndumiso Vukile Mdlovu；Kuen-Song Lin；Sat Septian Dwitya；Chung-Yu Chen；Chao-Lung Chiang
單位
出版者
著錄名稱、卷期、頁數 Topics in Catalysis 61, p.1653-1664
摘要 Remediation of dense non-aqueous phase liquids (DNAPLs) contaminants in groundwater has received considerable attention in the environmental field. Generally, DNAPLs can flow with groundwater and further infiltrate down to deeper aquitard zone that is difficult to be removed by pumping. The DNAPLs may also contaminate the soil and groundwater concurrently in the duration of flowing with groundwater slowly. In this study, remediation of 1,2-dichloroethane (1,2-DCE) in DNAPL contaminated groundwater was studied by a reductive reaction with polyethylenimine (PEI) surface-modified zero-valent iron nanoparticles (PEI-nZVI). The prepared PEI-nZVI was injected into upstream wells and reach the plume of DNAPLs down with the flowing groundwater. Moreover, nZVI was further characterized after field injection and 1-day reaction with the contaminants to assess its effectiveness for the on-site reduction of 1,2-DCE. After direct injection of PEI-nZVI into the contaminated plume, the concentrations of 1,2-DCE was significantly reduced. Moreover, the plume was decontaminated to nontoxic species onto the highly active nZVI. By using resistivity image profiling (RIP), the conductivity data of modified nZVI solution and sampled groundwater were similar. In addition, RIP can reveal complex subsurface DNAPLs structures by dense sampling of resistivity variation at shallow depth. Additionally, X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy studies indicated that after the reductive reaction, nZVI and PEI-nZVI were oxidized to Fe3O4. The interatomic distances for the reacted samples were 1.95 Å and 1.93 Å, respectively. The combined technique of floating surface-modified nZVI and RIP method would be economically and environmentally attractive.
關鍵字 Zero-valent iron nanoparticles；Polyethylenimine；DNAPLs；Chemical reduction；Injection method；Decontamination；Groundwater remediation
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI SSCI Scopus
產學合作 國內
通訊作者 Kuen-Song Lin
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版
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