零价铁
硝基苯
生物炭
吸附
硫化物
化学工程
吸附
化学
硫化铁
苯胺
纳米颗粒
环境修复
材料科学
无机化学
纳米技术
催化作用
污染
有机化学
硫黄
生态学
工程类
生物
热解
作者
Dejin Zhang,Yang Li,Siqi Tong,Xinbai Jiang,Lianjun Wang,Xiuyun Sun,Jiansheng Li,Xiaodong Liu,Jinyou Shen
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:8 (39): 22161-22168
被引量:67
摘要
Sulfide-modified nanoscale zerovalent iron (S-nZVI) was effectively utilized for the reduction of various contaminants, despite its applicability being limited due to agglomeration, oxidation and electron loss. In this study, biochar (BC)-supported S-nZVI was prepared to enhance the reactivity of S-nZVI for nitrobenzene (NB) reduction. Scanning electron microscopy images showed that the S-nZVI particles were well-dispersed on the BC surface as well as in the channels. NB removal and aniline formation could be significantly enhanced by using S-nZVI@BC, as compared to S-nZVI and blank BC. NB removal by S-nZVI@BC followed the pseudo second-order kinetics model and Langmuir isotherm model, suggesting hybrid chemical reaction-sorption was involved. Furthermore, a possible reaction mechanism for enhanced NB removal by S-nZVI@BC was proposed, including chemical adsorption of NB onto S-nZVI@BC, direct reduction by S-nZVI and enhanced electron transfer. The high reducibility of S-nZVI@BC as well as its excellent antioxidation ability and reusability demonstrated its promising prospects in remediation applications.
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