13X分子筛/凹凸棒土颗粒型复合材料吸附Zn2+的研究  

Adsorption of Zn2+ by 13X molecular sieve/attapulgite granular composite

作　　者：刘红[1,2] 徐积昀 殷萌[1,2] 范先媛 Liu Hong;Xu Jiyun;Yin Meng;Fan Xianyuan(College of Resources 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,湖北武汉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,湖北武汉430081

出　　处：《武汉科技大学学报》2019年第6期442-448,共7页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(41230638);湖北省环保厅科研资助项目(2017HB08)

摘　　要：以13X分子筛和天然黏土矿物凹凸棒土为原料,制备了13X分子筛/凹凸棒土颗粒型复合材料,并借助扫描电镜、透射电镜、X射线衍射等对复合材料结构与形貌进行表征,考察了不同煅烧温度及不同Zn2+浓度条件下13X分子筛/凹凸棒土颗粒型复合材料对水中Zn2+的吸附行为。结果表明,煅烧温度为550℃时,所制复合材料孔隙结构发达且抗压强度高、吸附性能好;吸附过程符合拟二级动力学,等温吸附实验数据符合Langmuir模型,复合材料对Zn2+的最大吸附量可达99.01mg·g-1;吸附速率的主要控制步骤为颗粒内扩散,此外,吸附过程中同时存在离子交换和化学沉淀。Based on 13 Xmolecular sieve and natural attapulgite,13 Xmolecular sieve/attapulgite granular composites were prepared,and the morphology and structure of composites were characterized by SEM,TEM,XRD,etc.The adsorption behavior of 13 Xmolecular sieve/attapulgite granular composite for Zn2+in the water was investigated with different calcination temperatures and Zn2+concentrations.The results show that the composite calcined at 550 ℃ has well-developed pore structure,high compressive strength and good absorption property.The adsorption process conforms with the pseudo-secondorder kinetics,isothermal adsorption test data are compliant with the Langmuir model,and the maximum absorption capability of Zn2+by composite reaches 99.01 mg·g-1.The adsorption rate is mainly controlled by intragranular diffusion.In addition,ion exchange and chemical precipitation exist simultaneously in the adsorption process.

关 键 词：13X分子筛 凹凸棒土 颗粒型复合材料 Zn2+吸附 离子交换 化学沉淀 吸附性能 

分 类 号：X703.1[环境科学与工程—环境工程]