Ghosh Sudipta, Mondal Shyamal, Kaur Rajwinder, Mondal Dhananjoy, Daripa Bishnu, Kumar Sinha Prasanta, Chandra Mondal Prakash, Das Sukhen, Dhar Anirban
Department of Chemistry, New Alipore College, Kolkata, 700 053, India.
Department of Chemistry, Indian Institute of Technology, Uttar Pradesh, 208 016, India.
Chem Asian J. 2024 Dec 16;19(24):e202400921. doi: 10.1002/asia.202400921. Epub 2024 Oct 31.
Thiol-functionalized mesoporous silica and materials potentially dedicated to diverse applications of composite materials, metal colloids, and metal catalysts, etc. Here, we developed a new synthesis route for 3-methacryloxypropyl trimethoxy silane (MPTMS) functionalized mesoporous silica (KIT-6), achieving a 71.5 % enhancement in thiol functionalization on KIT-6 surfaces. Characterization using XRD, TEM, BET, FTIR, Raman, Si NMR, XPS, and ICP-OES revealed structural and morphological features. XRD, TEM, and BET confirmed the three-dimensional structural stabilization of mesoporous silica with ~4 nm pore diameter and a surface area of 1451 m g. FTIR, Raman, and Si NMR studies established the mechanism of thiol functionalization, the formation of a new wormhole chain structural framework (WCSF), and stabilization through hydrogen bonding within the mesopores. The Si NMR spectra showed characteristic peaks (T, T, Q, Q) indicating self-condensed functionalized thiols with siloxane networks. XPS analysis validated enhanced thiol functionalization, indicating a structurally homogeneous WCSF suitable for mercury adsorption. ICP-OES measured a mercury adsorption capacity of 3199.6 mg g for KIT-6, with an Hg/S ratio of 1.8, corroborated by molecular structure and mechanism analysis. This innovative thiol functionalization approach enhances the efficacy of applications such as extracting Hg from contaminated sources.
硫醇功能化介孔二氧化硅以及可能用于复合材料、金属胶体和金属催化剂等多种应用的材料。在此，我们开发了一种用于3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPTMS）功能化介孔二氧化硅（KIT-6）的新合成路线，使KIT-6表面的硫醇功能化提高了71.5%。使用XRD、TEM、BET、FTIR、拉曼光谱、Si NMR、XPS和ICP-OES进行的表征揭示了其结构和形态特征。XRD、TEM和BET证实了介孔二氧化硅的三维结构稳定性，其孔径约为4nm，表面积为1451m²/g。FTIR、拉曼光谱和Si NMR研究确定了硫醇功能化的机制、新的虫孔链结构框架（WCSF）的形成以及通过介孔内氢键实现的稳定性。Si NMR光谱显示出特征峰（T、T、Q、Q），表明存在与硅氧烷网络自缩合的功能化硫醇。XPS分析验证了硫醇功能化的增强，表明存在适合汞吸附的结构均匀的WCSF。ICP-OES测量得出KIT-6对汞的吸附容量为3199.6mg/g，Hg/S比为1.8，分子结构和机理分析证实了这一点。这种创新的硫醇功能化方法提高了从污染源中提取汞等应用的功效。
