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Characterization and comparison of uniform hydrophilic/hydrophobic transparent silica aerogel beads: skeleton strength and surface modification

机译：均匀亲水/疏水透明二氧化硅气凝胶珠的表征和比较：骨架强度和表面改性

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摘要

Silica aerogel is a good adsorbent due to the large surface area and chemical stability. However, its inherent poor mechanical properties and hydrophobicity limit applications in water treatment. To improve the adsorption performance of silica aerogel, uniform transparent hydrophilic mesoporous silica aerogel beads with highly degree of sphericity were synthesized through a facile aging immersion and ambient pressure drying route. The designed hydrophilic silica aerogel beads possessed the mesopores, mean diameter of approximately with the average pore size of 12.51 nm, the specific surface area of 582.52 m(2) g(-1), and the pore volume of 1.46 cm(3) g(-1). For comparison, hydrophilic silica aerogel beads without skeleton improvement and hydrophobic silica aerogel beads were also obtained, respectively. The synthesized novel hydrophilic silica aerogel beads displayed a significantly improved adsorption performance with a favorable dye absorption capacity, superior to that of previously synthesised silica-based aerogel beads materials. This study demonstrates a facile and low-cost route toward transparent silica aerogel beads with macroscopic beads structures, which can be used as adsorbents, catalytic supports or the template to synthesize novel functional materials requiring high transmittance, high surface area and effective mass transport.
机译：二氧化硅气凝胶由于其较大的表面积和化学稳定性而成为良好的吸附剂。然而，其固有的差的机械性能和疏水性限制了在水处理中的应用。为了提高二氧化硅气凝胶的吸附性能，通过简便的老化浸泡和常压干燥途径，合成了球形度高的均匀，透明，亲水的介孔二氧化硅气凝胶微珠。设计的亲水性二氧化硅气凝胶珠具有中孔，平均直径约为12.51 nm，平均比表面积为582.52 m（2）g（-1），比容为1.46 cm（3）g （-1）。为了比较，还分别获得了没有骨架改进的亲水性二氧化硅气凝胶珠和疏水性二氧化硅气凝胶珠。合成的新型亲水性二氧化硅气凝胶珠粒表现出显着改善的吸附性能，具有良好的染料吸收能力，优于先前合成的二氧化硅基气凝胶珠粒材料。这项研究表明，向具有宏观珠粒结构的透明二氧化硅气凝胶珠粒的路线便宜且成本低廉，可以用作吸附剂，催化载体或模板来合成需要高透射率，高表面积和有效质量传递的新型功能材料。

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