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Silica based inorganic–organic hybrid materials for the adsorptive removal of chromium

机译：硅基无机-有机杂化材料，用于铬的吸附去除

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We employed polymer functionalized silica gel as an adsorbent for the removal of Cr( VI ) from water. The chains of 2-aminoethyl methacrylate hydrochloride (AEMA·HCl) polymer were grown from the surface of silica gel via surface-initiated conventional radical polymerization and the resulting hybrid material exhibited high affinity for chromium( VI ). To investigate the adsorption behavior of Cr( VI ) on diverse polymer based hybrid materials, the removal capacity of (SG-AEMH) was compared with our previously reported branched polyamine functionalized mesoporous silica (MS-PEI). The adsorption capacities of polymer based materials were also compared with their respective monolayer based platforms comprising a 3-aminopropyltriethoxysilane (APTES) functionalized silica gel (SG-APTES) and mesoporous silica (MS-APTES). The polymer based systems showed excellent Cr( VI ) adsorption efficiencies compared to monolayer counterparts. The structural characteristics and surface modification of these adsorbents were examined by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The experimental data were analyzed using the Langmuir and Freundlich models. Correlation coefficients were determined by analyzing each isotherm. The kinetic data of adsorption reactions were described by pseudo-first-order and pseudo-second-order equations. Thermodynamic parameters, i.e. , change in the free energy (Δ G °), the enthalpy (Δ H °), and the entropy (Δ S °), were also evaluated. The synthesized hybrid materials exhibited a high adsorption capacity for chromium ions. Furthermore, they could be regenerated and recycled effectively.
机译：我们采用聚合物功能化硅胶作为吸附剂，用于从水中去除Cr（VI）。经由表面引发的常规自由基聚合反应，从硅胶表面生长了甲基丙烯酸2-氨基乙酯盐酸盐（AEMA·HCl）聚合物的链，所得杂化材料对铬（VI）具有高亲和力。为了研究Cr（VI）在多种基于聚合物的杂化材料上的吸附行为，将（SG-AEMH）的去除能力与我们先前报道的支化多胺官能化介孔二氧化硅（MS-PEI）进行了比较。还将基于聚合物的材料的吸附能力与其各自的基于单层的平台进行了比较，所述平台包括3-氨基丙基三乙氧基硅烷（APTES）官能化的硅胶（SG-APTES）和中孔二氧化硅（MS-APTES）。与单层复合材料相比，基于聚合物的系统显示出优异的Cr（VI）吸附效率。通过傅立叶变换红外光谱（FTIR），透射电子显微镜（TEM），X射线光电子能谱（XPS）和热重分析（TGA）检查了这些吸附剂的结构特征和表面改性。使用Langmuir和Freundlich模型分析了实验数据。通过分析每个等温线来确定相关系数。吸附反应的动力学数据用拟一级方程和拟二级方程描述。还评估了热力学参数，即自由能（ΔG°），焓（ΔH°）和熵（ΔS°）的变化。合成的杂化材料对铬离子具有高吸附能力。此外，它们可以被有效地再生和再循环。

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