伊利石基沸石相复合材料对水中Mn^2+的吸附研究  

Adsorption Performance for Mn^2+from Aqueous Solutions by Zeolite Phase Composite Synthesized from Illite

作　　者：王曼曼 石林 张洋洋 Wang Manman;Shi Lin;Zhang Yangyang(Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,School of Environment and Energy,South China University of Technology,Guangzhou,Guangdong 510006;Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou,Zhejiang 310030)

机构地区：[1]华南理工大学环境与能源学院,工业聚集区污染控制与生态修复教育部重点实验室,广东广州510006 [2]华电电力科学研究院有限公司,浙江杭州310030

出　　处：《非金属矿》2020年第6期25-29,共5页Non-Metallic Mines

基　　金：国家科技支撑计划项目(2015BAD05B05+2)。

摘　　要：为提高伊利石对重金属离子的吸附性能,以伊利石为主要原料,碳酸钙和石膏为活化辅料,采用焙烧水热合成法制备沸石相复合材料(ZPC),研究其对Mn^2+的吸附效果。探讨了溶液pH值、ZPC投加量、吸附时间等因素对Mn^2+去除率的影响并进行动力学和热力学模拟。结果表明,吸附最佳pH值为5,饱和吸附时间为180 min,当Mn^2+初始质量浓度为25 mg/L,吸附剂投加量为0.6 g/L,ZPC对Mn^2+的最大去除率为99.32%,明显高于焙烧活化物和伊利石。ZPC对Mn^2+去除过程符合Freundlich等温吸附模型和准二级动力学模型,说明吸附以多分子层化学吸附为主。根据ZPC吸附Mn^2+前后的X射线衍射(XRD)、扫描电镜(SEM)与X射线光电子能谱(XPS)表征分析可知,吸附机理主要为离子交换和化学沉淀共同作用。In order to improve the adsorption capacity of illite for heavy metals,zeolite phase composite(ZPC)was first prepared by calcination with illite,calcium carbonate and gypsum and then by hydrothermal process with those activator as raw materials and used to adsorb Mn^2+from aqueous solution.The effect of solution pH,adsorbent dosage and contact time were investigated by adsorption experiment.Also,the kinetic model and adsorption isotherm model of ZPC for removing Mn^2+were fitted.It was found that the saturated adsorption time was 180 min and the optimum pH value was 5.When the initial concentration of Mn^2+was 25 mg/L and the adsorbent dosage was 0.6 g/L,the maximum removal efficiency for Mn^2+by ZPC was 99.32%which was much higher than only calcined activator without hydrothermal treatment and illite.The removal process was in accordance with Freundlich isotherm and the pseudo second-order kinetic model,which proved the process was dominated by monolayer chemical adsorption.Finally,the ZPC adsorbents before and after Mn^2+adsorption were characterized by XRD,SEM,and XPS in order to help to understand adsorption mechanism.So,the conclusion was drawn that the principal adsorption mechanism of Mn^2+was ion exchange between Ca^2+and Mn^2+followed precipitation.

关 键 词：伊利石 沸石相复合材料 焙烧-水热合成法 MN^2+ 吸附机理 

分 类 号：TB332[一般工业技术—材料科学与工程] X703[环境科学与工程—环境工程]