巯基功能化13X分子筛对Pb(Ⅱ)的吸附
Adsorption of Pb(Ⅱ) by thiol-functionalized 13X zeolite
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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<Abstract: 13X zeolite was modified by 3-mercaptopropyltrimethoxysilane (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 Pb2+ in aqueous solution. It is verified by the adsorption experiment that thiol-functional materials have better efficient treatment of Pb2+ than the raw materials. The sorption isotherm of Pb2+ 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 intra-particle diffusion was not the dominate mechanism in this adsorption process. Pb2+ in aqueous solution was removed with thiol-ligands on the surfaces of zeolite and the entrances of holes.
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