An organic–inorganic hydrophobic mesoporous silica has been successfully prepared by a co-condensation method with tetraethoxysilane (TEOS) and vinyltriethoxysilane (VTES) as mixed precursors under acidic condition. The synthesized mesoporous silica has been characterized by small-angle X-ray diffraction, transmission electron microscopy, N₂ sorption isotherms, magic-angle spinning nuclear magnetic resonance, and X-ray photoelectron spectroscopy. It is found that the newly synthesized adsorbents exhibit a uniform mesostructure with the vinyl groups embedded into the network of mesoporous silica. Results also show that mesoporous silica could convert from a 2D hexagonal structure (p6m) to a three-dimensional cubic structure (Ia3d) with the increase of the VTES/(VTES+TEOS) molar ratio. This structure transition could significantly increase the surface area, which also proves that VTES exerts a structure-directing effect on co-condensation synthesis. This functionalized mesoporous silica (v-SiO₂) has been applied to test its ability in adsorbing p-xylene. It is observed that these silica materials show improved humidity resistance with the Q_wet/Q_dry increasing from 56.2 to 85.2% (Q_dry and Q_wet stand for the adsorption capacity under dry and wet conditions, respectively). After the adsorption, the adsorbed p-xylene was desorbed from the adsorbents by a vacuum pump. Results show that the desorption ratio of p-xylene could reach up to 88.1% under wet conditions for the adsorbent with the molar ratio VTES/(VTES+TEOS) of 15% (v-SiO₂ (15%)). The adsorption/desorption recycling tests prove that the v-SiO₂ could possess prominent stability with over 96% adsorption capacity being kept after several cycles.

中文翻译：

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乙烯基三乙氧基硅烷官能化有序介孔二氧化硅，用于通过吸附/解吸工艺去除挥发性有机化合物

通过在酸性条件下以四乙氧基硅烷（TEOS）和乙烯基三乙氧基硅烷（VTES）作为混合前体的共缩合方法，成功制备了有机-无机疏水中孔二氧化硅。通过小角X射线衍射，透射电子显微镜，N ₂表征了合成的介孔二氧化硅吸附等温线，魔角旋转核磁共振和X射线光电子能谱。发现新合成的吸附剂表现出均匀的介孔结构，其中乙烯基嵌入到介孔二氧化硅的网络中。结果还表明，随着VTES /（VTES + TEOS）摩尔比的增加，介孔二氧化硅可以从二维六方结构（p6m）转变为三维立方结构（Ia3d）。这种结构转变可以显着增加表面积，这也证明了VTES对共聚合成具有结构指导作用。这种功能化的介孔二氧化硅（v-SiO ₂）已用于测试其吸附p的能力。-二甲苯。观察到这些二氧化硅材料显示出改善的耐湿性，Q_湿/ Q_干从56.2％增加到85.2％（Q_干和Q_湿分别代表在干和湿条件下的吸附能力）。吸附后，通过真空泵将吸附的对二甲苯从吸附剂上解吸。结果表明，在湿润条件下，VTES /（VTES + TEOS）摩尔比为15％（v-SiO ₂（15％））时，对二甲苯的解吸率可达到88.1％。吸附/解吸循环测试证明v-SiO ₂ 几个循环后可保持超过96％的吸附容量，具有显着的稳定性。