Facile sol–gel synthesis of thiol-functionalized materials from TEOS-MPTMS-PMHS system
Facile sol–gel synthesis of thiol-functionalized materials from TEOS-MPTMS-PMHS system
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DOI：
10.1007/s10971-011-2585-6
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发表时间：
2011
影响因子：
2.5
通讯作者：
S. Zhai;Li Zhang;B. Zhai;Qing-da An
中科院分区：
文献类型：
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作者：
S. Zhai;Li Zhang;B. Zhai;Qing-da An
以正硅酸乙酯、3-巯丙基三甲氧基硅烷、聚甲基氢硅氧烷为原料，在无结构导向剂存在下，在碱性条件下，通过共缩聚反应成功制备了具有多孔结构的巯基功能化溶胶-凝胶材料。采用N2吸附/脱附等温线、SEM、TG-DTG、FT-IR和固体29 Si MAS NMR等技术研究了制备工艺参数对织构特性的影响。这些表征表明，巯基功能基团已成功地引入到多孔网络中，并且可以通过调节凝胶体系中相应前体的含量来调节负载量。此外，所制备的样品具有高比表面积、大孔容、可调孔径和良好的热稳定性。吸附实验表明，巯基修饰材料对水溶液中的重金属离子具有选择性吸附能力，在优化的实验条件下，对Pb 2+的吸附率可达99.4%。
Thiol-functionalized sol–gel materials with porous structures were successfully prepared via co-condensation of tetraethoxysilane, (3-mercaptopropyl)-trimethoxysilane, polymeric polymethylhydrosiloxane in the absence of traditional structure-directing agents under proposed basic conditions. The dependence of textural characteristics on the preparation parameters were investigated employing various techniques as such N2adsorption/desorption isotherms, SEM, TG-DTG, FT-IR and solid state29Si MAS NMR measurements. It was shown by these characterizations that thiol-functional groups have been successfully introduced into the porous network and the loadings could be tuned by adjusting the content of corresponding precursor in the gel system. Besides, the as-prepared samples exhibited high surface areas, large pore volume, tunable pore diameters and favorable thermal stability. Adsorption experiments indicated that thiol-incorporated materials have selective adsorption ability toward heavy metal ions from aqueous solutions, and a high capacity in adsorbing heavy metal ion of Pb2+(up to 99.4%) was observed under optimized experimental conditions.