巯基功能化13X分子筛对Pb(Ⅱ)的吸附  

Adsorption of Pb(Ⅱ) by thiol-functionalized 13X zeolite

作　　者：孙霞[1] 王学松[1] 李功军[1] 

机构地区：[1]淮海工学院环境工程系,连云港222001

出　　处：《环境工程学报》2011年第11期2571-2576,共6页Chinese Journal of Environmental Engineering

基　　金：淮海工学院自然科学基金资助项目(2009023)

摘　　要：用3-巯丙基三甲氧基硅烷(MPTMS)对13X分子筛表面进行修饰,采用XRD和FT-IR测试方法对功能化前后的分子筛结构进行表征,结果表明,功能化后分子筛在保持原有结构同时表面还接枝了对Pb2+离子有吸附能力的巯基基团。吸附实验表明,巯基功能化分子筛对水中Pb2+离子比原分子筛具有更强的吸附去除效果,饱和吸附容量和去除率提高近一倍。SH-13X对Pb2+离子的等温吸附符合Langmuir模型,最大吸附容量为47.01 mg/g,吸附强度b为2.26。动力学分析表明SH-13X对Pb2+离子的吸附过程更符合准二级动力学模型,而且粒内扩散不是该吸附过程的主要吸附机制。溶液中的Pb2+与嫁接在分子筛表面及孔口位置的-SH功能团形成配位络合物而去除。13X zeolite was modified by 3-mercaptopropyhrimethoxysilane （MPTMS）. The structure of materials before and after functionalization was investigated by X-ray powder diffraction （XRD） and fourier transform infrared spectroscopy （FT-IR）. The results show that the functionalized materials still kept the original structure and morphology, and at the same time the materials had grafted some thiol-groups which had strong binding ability for Pb^2＋ in aqueous solution. It is verified by the adsorption experiment that thiol-functional materials have better efficient treatment of Pb^2＋ than the raw materials. The sorption isotherm of Pb^2＋ on SH-13X zeolite followed the Langmuir model. The maximum sorption capacity was 47.01 mg/g and absorptive intensity was 2.26. Kinetic analysis gives out that the pseudo-second-order equation provided the best fit to experimental data, and intraparticle diffusion was not the dominate mechanism in this adsorption process. Pb^2＋ in aqueous solution was removed with thiol-ligands on the surfaces of zeolite and the entrances of holes.

关 键 词：巯基 功能化 13X分子筛 吸附 PB2+ 

分 类 号：O647.31[理学—物理化学]