Nanoscale zero-valent iron for metal/metalloid removal from model hydraulic fracturing wastewater 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Chemosphere
年/卷/期
2017 / 176 /
页码
315-323
出版商
Elsevier Ltd
ISSN号
00456535
作者
Sun, Yuqing 1;Lei, Cheng 2;Khan, Eakalak 3;Chen, Season S. 4;Tsang, Daniel C.W. 4;Ok, Yong Sik 5;Lin, Daohui 6;Feng, Yujie 7;Li, Xiang-dong 4 1 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 150090, China 2 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, Department of Environmental Science, Zhejiang University, 310058, China 3 Department of Civil Engineering, North Dakota State University, Dept 2470, P.O. Box 6050, 58108, United States 4 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong dan.tsang@polyu.edu.hk 5 School of Natural Resources and Environmental Science & Korea Biochar Research Center, Kangwon National University, 24341, South Korea 6 Department of Environmental Science, Zhejiang University, 310058, China 7 State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 150090, China yujief@hit.edu.cn;
摘要
Nanoscale zero-valent iron (nZVI) was tested for the removal of Cu(II), Zn(II), Cr(VI), and As(V) in model saline wastewaters from hydraulic fracturing. Increasing ionic strength (I) from 0.35 to 4.10 M (Day-1 to Day-90 wastewaters) increased Cu(II) removal (25.4–80.0%), inhibited Zn(II) removal (58.7–42.9%), slightly increased and then reduced Cr(VI) removal (65.7–44.1%), and almost unaffected As(V) removal (66.7–75.1%) by 8-h reaction with nZVI at 1–2 g L−1. The removal kinetics conformed to pseudo-second-order model, and increasing I decreased the surface area-normalized rate coefficient (ksa) of Cu(II) and Cr(VI), probably because agglomeration of nZVI in saline wastewaters restricted diffusion of metal(loid)s to active surface sites. Increasing I induced severe Fe dissolution from 0.37 to 0.77% in DIW to 4.87–13.0% in Day-90 wastewater; and Fe dissolution showed a significant positive correlation with Cu(II) removal. With surface stabilization by alginate and polyvinyl alcohol, the performance of entrapped nZVI in Day-90 wastewater was improved for Zn(II) and Cr(VI), and Fe dissolution was restrained (3.20–7.36%). The X-ray spectroscopic analysis and chemical speciation modelling demonstrated that the difference in removal trends from Day-1 to Day-90 wastewaters was attributed to: (i) distinctive removal mechanisms of Cu(II) and Cr(VI) (adsorption, (co-)precipitation, and reduction), compared to Zn(II) (adsorption) and As(V) (bidentate inner-sphere complexation); and (ii) changes in solution speciation (e.g., from Zn2+ to ZnCl3− and ZnCl42−; from CrO42− to CaCrO4 complex). Bare nZVI was susceptible to variations in wastewater chemistry while entrapped nZVI was more stable and environmentally benign, which could be used to remove metals/metalloids before subsequent treatment for reuse/disposal.
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关键词/主题词
Chemicals removal (water treatment) (major);Chemical analysis;Chemical speciation;Chromium;Chromium compounds;Dissolution;Hydraulic fracturing;Ionic strength;Iron;Iron compounds;Metals;Nanotechnology;Precipitation (chemical);Spectroscopic analysis;Wastewater reclamation;Wastewater treatment;X ray spectroscopy;Zinc;Zinc compounds;
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