Dechlorination of 2,4-dichlorophenol by nickel nanoparticles under the acidic conditions

查看全文 作　　者：FENG [1]Li;GE [1]XiaoPeng;LI [2]Yi;WANG [1]DongSheng;TANG [1]HongXiao

机构地区：[1]State Key Laboratory of Environmental Aquatic Chemistry,RCEES,Chinese Academy of Sciences,Beijing 100085,China;[2]Nanotechnology Center,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Chinese Science Bulletin》索引2011年第56卷第21期,共9页

基　　金：supported by the National Basic Research Program of China (2007CB407304);the National Science & Technology Major Project of China (2009ZX07209-004) 摘　　要：Metal nanoparticles are effective for remediation of contamination with a range of compounds including chlorinated organics.However,the sorption process of the passivation oxide layers on the metal nanoparticle surfaces may result in incomplete degradation of contaminants.This phenomenon can be prevented by an acidic washing procedure or reaction in an acidic medium.In this paper,nickel nanoparticles manufactured via the carbonyl powder process were analyzed using scanning electron microscopy,transmission electron microscopy,X-ray diffraction and energy-dispersive X-ray spectroscopy.The sorption and degradation of 2,4-dichlorophenol (2,4-DCP) by nickel nanoparticles under acidic conditions was then investigated.Transmission electron microscopy and XRD results showed that the nickel nanoparticles range in size from 10 to 20 nm,and a thin passivation layer of NiO is present on the surface.This oxide layer can be removed by pretreatment washing with acidic solutions.It was indicated that dechlorination was the key reaction pathway for degradation of 2,4-DCP by nickel nanoparticles under acidic conditions.The main degradation products were 4-Chlorophenol,2-Chlorophenol,and Phenol,and among these,Phenol was dominant.The acidic medium promoted degradation by providing an appropriate pH,and H+ may be involved in the reaction.Dechlorination of 2,4-DCP by nickel nanoparticles under the acidic condition follows the second order kinetic model,and the rate constants at 298,306,316 K are 0.02,0.2 and 0.3 (g L h)-1,respectively. 关键词：镍纳米颗粒酸性条件二氯酚脱氯透射电子显微镜镍纳米粒子金属纳米粒子扫描电子显微镜

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Dechlorination of 2,4-dichlorophenol by nickel nanoparticles under the acidic conditions

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