摘要
通过硫化对纳米零价铁(nZVI)进行改性,制备了硫化纳米零价铁(S-nZVI),而后对三氯乙烯(TCE)进行降解实验研究。利用SEM、XRD对S-nZVI进行材料的结构表征,进而研究不同材料、不同S/Fe摩尔比、不同初始TCE浓度、不同初始pH条件下,S-nZVI对TCE的降解效果。结果表明,S-nZVI主要成分为Fe^(0)并含有少量的FeS,制得的S-nZVI为球状结构,表面有片层状的FeS生成;当S/Fe摩尔比为0.6,初始浓度为20 mg/L时,TCE的降解率为87.2%,远高于nZVI(降解率为56.4%)。经动力学分析后,S-nZVI去除TCE符合伪二级动力学过程,表明其降解过程以化学还原为主。nZVI经过硫化后提高了材料的电子选择性,使其成为修复受污染土壤和地下水的有前途的功能材料。
The sulfurized nano-zero-valent iron(S-nZVI)was prepared by modifying nano-zero-valent iron(nZVI)by sulfurization.The degradation experiments of trichloroethylene(TCE)were carried out.The synthesized S-nZVI were characterized by using XRD and SEM.The degradation effect of S-nZVI on TCE was studied under the conditions of different materials,S/Fe molar ration,initial TCE concentrations,and initial pH.The results show that the main component of S-nZVI is Fe^(0) and contains a small amount of FeS.The prepared S-nZVI has a spherical structure with flake FeS formed on the surface.When the S/Fe molar ratio is 0.6 and the initial concentration is 20 mg/L,the degradation rate of TCE is 87.2%,much better than nZVI(degradation rate 56.4%).After kinetic analysis,the removal of TCE by S-nZVI fitted to the pseudo-second-order kinetic equation,indicating that the degradation process is dominated by chemical reduction.The sulfurization of nZVI improves the electronic selectivity of the material,making the synthesized S-nZVI a promising material for the remediation of contaminated soil and groundwater.
作者
张书彬
汪天霄
郭昕
王彦云
陈胜文
王利军
ZHANG Shubin;WANG Tianxiao;GUO Xin;WANG Yanyun;CHEN Shengwen;WANG Lijun(School of Resources and Environmental Engineering,Shanghai Polytechnic University,Shanghai 201209)
出处
《上海第二工业大学学报》
2021年第4期289-296,共8页
Journal of Shanghai Polytechnic University
关键词
硫化纳米零价铁
三氯乙烯去除
水污染
顶空法
脱氯
sulfurized nano-zero-valent iron
trichloroethylene removal
water pollution
headspace method
dechlorination
