颗粒13X分子筛固定床对水中Zn^(2+)的去除  

Removal of Zn^(2+) by granular 13X molecular sieves in fixed bed from aqueous solution

作　　者：徐积昀 刘红[1,2] 殷萌[1] 范先媛[1] 张家源 薛壮壮 刘宇卓 XU Jiyun;LIU Hong;YIN Meng;FAN Xianyuan;ZHANG Jiayuan;XUE Zhuangzhuang;LIU Yuzhuo(College of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,武汉430081

出　　处：《黑龙江大学自然科学学报》2018年第4期453-459,共7页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金资助项目(50904047);武汉科技大学研究生创新项目(JCX2017023)

摘　　要：以粉末13X分子筛为原料、凸凹棒土为粘合剂制备了颗粒13X分子筛复合材料,采用扫描电子显微镜、X-射线衍射仪、比表面积分析仪等对其形貌和结构进行表征,研究了颗粒13X分子筛固定床对Zn^(2+)的去除及其机理。结果表明,颗粒13X分子筛具有微孔-介孔-大孔的多级孔结构,BET比表面积达442. 95 m^2·g^(-1),仍保留了粉末13X分子筛的晶相结构;颗粒13X分子筛固定床除Zn^(2+)的机理主要为离子交换吸附和化学沉淀作用,并且穿透点出水pH在7左右,吸附饱和后材料中锌的含量为9. 75%;颗粒13X分子筛固定床中去除Zn^(2+)的过程符合Thomas模型,不同流速下对Zn^(2+)的平衡吸附量为1. 36～1. 81 mmol·g^(-1)。Zn^2＋ in aqueous solution was removed by granular 13X molecular sieves composite. The morphology and structure of granular 13X molecular sieves were characterized by SEM, XRD and specific surface area. The mechanism of Zn^2＋ removal by granular 13X molecular sieves in fixed bed was investi- gated. The results show that granular 13X molecular sieves possess the structure of a hierarchical pore with microporous-mesoporous-macroporous and the BET specific surface area reaches 442.95 m^2 · g^-1 The crystal phase of 13X molecular sieves powder is kept in the granular 13X. The mechanism of Zn^2＋ removal by granular 13X molecular sieves in the fixed bed is attributed to ion exchange adsorption and chemical precipitation. The effluent pH at the breakthrough point is around 7, and the content of zinc in the saturated material is 9.75%. The process of Zn^2＋ removal by granular 13X molecular sieves in fixed bed is fitted with Thomas model, and the equilibrium adsorption capacity of granular 13X molecular sieves for Zn^2＋ at different flow rates is 1.36 to 1.81 mmol· g^-1.

关 键 词：颗粒13X分子筛 Zn(Ⅱ) 固定床 吸附 

分 类 号：X703[环境科学与工程—环境工程]