凹土负载零价铁去除水中Cr(Ⅵ)的研究  

A Study on Attapulgite-supported Zero-valent Iron for Removal of Cr(Ⅵ)

作　　者：汤同洋[1] 周守勇[1] 李良璐[1] 欧洁[1] 薛爱莲[1] 赵宜江[1] 

机构地区：[1]淮阴师范学院化学化工学院,淮安市新型环境功能材料重点实验室,江苏淮安223300

出　　处：《淮阴师范学院学报（自然科学版）》2013年第2期135-139,共5页Journal of Huaiyin Teachers College;Natural Science Edition

基　　金：国家自然科学基金资助项目(20976067);江苏省高校自然科学研究面上项目(12KJD530001);江苏省高校大学生实践创新训练计划项目

摘　　要：以FeC12·4H2O和NaBH4为原料,凹土为载体,采用液相还原法制备凹土负载零价铁,并用扫描电子显微镜(SEM)及X射线衍射(XRD)进行表征.考察了Cr(VI)溶液初始浓度,pH,凹土负载零价铁投加量及反应时间等条件对Cr(VI)去除效果的影响.结果表明,Cr(VI)的去除率随反应时间和凹土负载零价铁投加量增加而升高,而随pH和Cr(VI)溶液初始浓度升高而降低;凹土负载零价铁对Cr(VI)的还原去除基本符合伪一级反应动力学模型.凹土负载零价纳米铁Cr(VI)的良好去除效果表明其在地表水原位修复领域具有较好的应用前景.Attapulgite-supported zero-valent Iron was synthesized by borohydride reduction method and characterizod by thescanning electron microscope （SEM） and X-my diffraction （XRD）. The attapulgite-supperted zero-valent Iron particles were tested for reduction of Cr（Ⅵ） in water. The experiments investigated the effects of initial Cr（Ⅵ） concentration, pH, attapulgite-supperted zero-valent Iron dosage and reaction time on the removal efficiency of Cr （Ⅵ）. The results show that the removal effciency of Cr（Ⅵ） increases with the increase in time and attapulgitesupported zero-valent Iron dosage but decreases with the increase in pH and initial Cr（Ⅵ） concentmtio. Reduction kinetic of Cr （Ⅵ） by attapulgite-supported zero-valent Iron was described by a pseudo first-order reaction. The better Cr（Ⅵ） removal rate demonstrates that attapulgite-supported zero-valent Iron has the potential to become an effective agent for in situ subsurface environment remediation.

关 键 词：凹土 零价铁 六价铬 批实验 

分 类 号：X703[环境科学与工程—环境工程]