Superior trichloroethylene removal from water by sulfide-modified nanoscale zero-valent iron/graphene aerogel composite  

作　　者：Qiong Bin Bin Lin Ke Zhu Yaqian Shen Yuanyuan Man Boyang Wang Changfei Lai Wenjin Chen 

机构地区：[1]School of Resources and Environment,University of Electronic Science and Technology of China,Chengdu 610054,China [2]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 610054,China

出　　处：《Journal of Environmental Sciences》2020年第2期90-102,共13页环境科学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.51408101);the Key Research and Development (R&D) Program from the Department of Science and Technology of Sichuan Province (No.2018FZ0011).

摘　　要：Sulfide-modified nanoscale zero-valent iron(S-nZVI) is a promising material for removal of organic pollutants from water, but S-nZVI nanoparticles(NPs) easily agglomerate and have poor contact with organic contaminants.Herein, we propose a new S-nZVI/graphene aerogel(S-nZVI/GA) composite which exhibits superior removal capability for trichloroethylene(TCE) from water.Three-dimensional porous graphene aerogel(GA) can improve the efficiency of electron transport, enhance the adsorption of organic pollutants and restrain the agglomeration of the core-shell S-nZVI NPs.The TCE removal rates of Fe S, nZVI, GA and S-nZVI were 27.8%, 42%, 63% and 75% in 2 hr, respectively.Furthermore, TCE was completely removed within 50 min by S-nZVI/GA.The TCE removal rate increased with increasing p H and temperature, and TCE removal followed the pseudo-first-order kinetic model.The results demonstrate the great potential of S-nZVI/GA composite as a low-cost,easily separated and superior monolithic adsorbent for removal of organic pollutants.Sulfide-modified nanoscale zero-valent iron(S-nZVI) is a promising material for removal of organic pollutants from water, but S-nZVI nanoparticles(NPs) easily agglomerate and have poor contact with organic contaminants.Herein, we propose a new S-nZVI/graphene aerogel(S-nZVI/GA) composite which exhibits superior removal capability for trichloroethylene(TCE) from water.Three-dimensional porous graphene aerogel(GA) can improve the efficiency of electron transport, enhance the adsorption of organic pollutants and restrain the agglomeration of the core-shell S-nZVI NPs.The TCE removal rates of Fe S, nZVI, GA and S-nZVI were 27.8%, 42%, 63% and 75% in 2 hr, respectively.Furthermore, TCE was completely removed within 50 min by S-nZVI/GA.The TCE removal rate increased with increasing p H and temperature, and TCE removal followed the pseudo-first-order kinetic model.The results demonstrate the great potential of S-nZVI/GA composite as a low-cost,easily separated and superior monolithic adsorbent for removal of organic pollutants.

关 键 词：Organic pollutant REMOVAL TRICHLOROETHYLENE (TCE) Sulfide-modified nanoscale zero-valent iron GRAPHENE AEROGEL Nanocomposite 

分 类 号：X52[环境科学与工程—环境工程]