活性炭负载纳米铁的制备及其脱氯六氯乙烷的研究  

Synthesis and Dechlorination Properties of Nano-zero-valent Iron Loaded Activated Carbon Material

作　　者：梁贺升 张和达 Liang Hesheng;Zhang Heda(College of Chemistry and Environmental Engineering,Hanshan Normal University,Chaozhou 52104,China)

机构地区：[1]韩山师范学院化学与环境工程学院

出　　处：《广东化工》2019年第21期23-24,39,共3页Guangdong Chemical Industry

基　　金：广东省教育厅青年创新人才类项目，项目编号2014KQNCX196;潮州市科技计划项目，项目编号2017GY05

摘　　要：纳米零价铁能够快速有效地去除多种污染物,近年受到人们的广泛重视和研究。由于纳米零价铁粒径小、比表面积大,因而易团聚,稳定性差。而且容易被空气氧化,导致活性降低。为了解决这个问题,本文首先制备活性炭负载纳米铁,然后研究活性炭负载纳米铁去除水中六氯乙烷的脱氯效果,探究了不同六氯乙烷的初始浓度、不同活性炭负载纳米铁的投放量、不同的反应时间以及不同的初始pH值对脱氯效果的影响。得出以下结论:(1)20 mL六氯乙烷溶液的起始浓度由10 mg/L增大至200 mg/L时,与12 g活性炭负载纳米铁在室温下反应40 min的氯原子脱除率先增大后减少,当六氯乙烷起始浓度等于50 mg/L,其氯原子脱除率最大,为74.73%。(2)活性炭负载纳米铁的投放量从2 g增加至16 g时,与20 mL 50 mg/L六氯乙烷反应40 min的氯原子脱除率先迅速增长后趋于平缓,投放量超过12 g后,氯原子脱除率几乎停止增长。(3)12 g活性炭负载纳米铁与20 mL 50 mg/L六氯乙烷在室温下反应,氯原子脱除率随着反应时间增加先迅速增长后趋于平缓,反应时间大于40 min后,脱除率趋于平缓;同样的反应条件,溶液初始pH值处于弱酸时有利于脱氯反应,过酸或者碱性条件反而制约了六氯乙烷的脱氯效果。Nano-zero-valent iron can quickly and effectively remove a variety of pollutants,and has received extensive attention and research in recent years.Since the nano-zero-valent iron has a small particle size and a large specific surface area,it is easy to agglomerate and has poor stability.Moreover,it is easily oxidized by air,resulting in a decrease in activity.In order to solve this problem,this paper firstly prepared nano-zero-valent iron loaded activated carbon(Nano-ZVI/AC),and then studied the dechlorination effect of Nano-ZVI/AC to remove hexachloroethane from water,and investigated the dechlorination effect of the different initial concentration of hexachloroethane,and also the different amount of Nano-ZVI/AC,the different reaction times and different initial pH values.The result showed that:(1)The 20 mL hexachloroethane solution’s initial concentration increased from 10 mg/L to 200 mg/L.At the same time,the chlorine removal rate of 12 g Nano-ZVI/AC at room temperature for 40 min increased first and then decreased.The chlorine removal rate was the highest when the initial concentration of hexachloroethane was 50 mg/L,which was 74.73%.(2)The dosage of Nano-ZVI/AC increased from 2 g to 16 g,at the same time,the 20 mL 50 mg/L hexachloroethane’s chlorine removal rate with whitch reacting after 40 min was increased rapidly and then tended to be gentle.After the dosage exceeds 12 g,the removal rate almost stopped growing.(3)12 g Nano-ZVI/AC reacted with 20 mL 50 mg/L hexachloroethane at room temperature,the removal rate of chlorine atom increased rapidly with the increase of reaction time and then tended to be gentle.After the reaction time was more than 40min,the removal rate tended to be gentle;By the same reaction conditions,the initial weak acidity pH value of the solution was favorable for dechlorination,and the initial peracid or alkaline pH value of the solution restricted the dechlorination.

关 键 词：活性炭负载纳米铁 六氯乙烷 脱氯降解 

分 类 号：TQ[化学工程]