流变相法制备包裹型Starch/Fe^0及去除水中Cr(Ⅵ)的反应动力学研究  

Preparation of coated Starch /Fe^0 by using rheological phase reaction method and research on reaction kinetic of Cr(Ⅵ) removal in water

作　　者：樊文井[1] 成岳[1] 焦创[1] 曾小军[1] 王维[1] 

机构地区：[1]景德镇陶瓷学院材料学院,江西景德镇333403

出　　处：《功能材料》2014年第19期19035-19039,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(56218018);景德镇市科技局资助项目(701301257)

摘　　要：以水溶性淀粉(starch)为包裹剂,采用流变相反应法制备了包裹型纳米零价铁(Starch/Fe0)。并用XRD、SEM和TEM等手段对样品进行了表征。研究了样品投加量、pH值、初始Cr(Ⅵ)浓度及铜离子浓度对水溶液中Cr(Ⅵ)去除率的影响及反应动力学,探讨了包裹型Starch/Fe0去除Cr(Ⅵ)的反应机理。实验结果表明,包裹型Starch/Fe0投加量为0.6 g/L,pH值为5,初始Cr(Ⅵ)浓度为10 mg/L时,Cr(Ⅵ)的去除率可达100%。当反应体系中Cu2+和Cr(Ⅵ)共存时,Cu2+在反应中对Cr(Ⅵ)的去除有促进作用。包裹型Starch/Fe0对Cr(Ⅵ)的还原过程符合准一级反应动力学模型。The coated nanoscale zero-valent iron (coated Starch/Fe0 )was synthesized with starch as coating agent,and by using rheological phase reaction method.The sample was fully characterized by means of XRD, SEM and TEM.The effection of sample dosage,pH values,initial Cr(Ⅵ)concentration and Cu2 + concentration on removal rate of Cr(Ⅵ),and the reaction kinetics were investigated.The reaction mechanism was researched about the removal of Cr(Ⅵ)with coated Starch/Fe0 .The experimental results indicate that the removal rate of Cr(Ⅵ)was 100% when the sample dosage was 0.6 g/L,the pH values was 5,and the initial Cr(Ⅵ)concentra-tion was 10 mg/L.Cu2 + has promote effect on the removal of Cr(Ⅵ)when the Cu2 + and Cr (Ⅵ)coexist in the reaction system.The reaction kinetic follows pseudo-first-order reaction model.

关 键 词：流变相法 包裹型 starch/Fe0 Cr(Ⅵ) 去除率 反应动力学 

分 类 号：X52[环境科学与工程—环境工程]