羟基磷灰石负载铁钯双金属对水中Cr(VI)的去除  

Removal of Cr(VI)from Aqueous Solutions by Hydroxylapatite-supported Fe/Pd Nanoparticles

作　　者：章结焱 周溶冰[1] 吴卫红[1] 潘新潮 赵红挺 ZHANG Jieyan;ZHOU Rongbing;WU Weihong;PAN Xinchao;ZHAO Hongting(School of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou Zhejiang 310018,China)

机构地区：[1]杭州电子科技大学材料与环境工程学院,浙江杭州310018

出　　处：《杭州电子科技大学学报（自然科学版）》2018年第4期82-89,共8页Journal of Hangzhou Dianzi University：Natural Sciences

基　　金：国家自然科学基金资助项目(40801116;41271249);浙江省自然科学基金资助项目(LY14D010009)

摘　　要：采用茶树叶提取液还原合成纳米零价铁,并利用工业羟基磷灰石(HAP)为载体制备了负载型铁钯双金属纳米颗粒(HAP-Fe/Pd NPs),用于去除水中Cr(VI)的实验研究。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、傅里叶红外光谱(FTIR)等表征手段对材料反应前后的微观结构及成分进行了分析。实验结果表明,加入PdCl_2后的去除效果明显增强;当Cr(VI)初始浓度为5mg·L^(-1),HAP-Fe/Pd NPs投加量为6g·L^(-1),反应温度为303K且pH为2时,最佳去除率趋近于100%。反应动力学拟合结果表明,羟基磷灰石负载铁钯双金属还原去除Cr(VI)符合准一级反应动力学模型和准二级吸附反应动力学模型,说明去除六价铬的主要机理包括吸附和催化还原。Cr（VI）was removed by hydroxylapatite-supported Fe/Pd nanoparticles（HAP-Fe/Pd NPs）,which was prepared by industrial hydroxylapatite-supported nanoscale zero valent iron/Pd.NZVI was obtained from reduction of tea leaf extract.The synthesized and reacted HAP-Fe/Pd NPs were characterized by SEM,EDS,TEM,XRD and FTIR,respectively.Experimental results showed that removal efficiency of Cr（VI）by HAP-Fe/Pd NPs was much higher than other materials.The optimal removal rate reached up to about 100%,when the initial Cr（VI）concentration is 5mg·L^-1,the dosage is 6g·L^-1,the reaction temperature is 303 Kand pH=2.Additionally,the reaction kinetics indicated that the Cr（VI）removal process fitted well to the pseudo first-order model and the pseudo second-order model.It suggested that the mechanism of Cr（VI）remediation by HAP-Fe/Pd NPs mainly involved adsorption and catalytic reduction.

关 键 词：纳米零价铁 羟基磷灰石 CR(VI) 反应动力学 

分 类 号：X523[环境科学与工程—环境工程]