Elaborate control over the morphology and pore structure of porous silicas for VOCs removal with high efficiency and stability

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• 作者：Hongning Wang ; Tao Wang ; Meihua Yu ; Xiaodan Huang ; Jing Zhong ; Weiqiu Huang&#8230
• 关键词：Hexagonal silica ; Siliceous vesicle ; Siliceous foam ; Volatile organic compound ; Adsorption
• 刊名：Adsorption
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 页码：37-50
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Industrial Chemistry/Chemical Engineering; Surfaces and Interfaces, Thin Films; Engineering Thermodynamics, Heat and Mass Transfer;
• 出版者：Springer US
• ISSN：1572-8757
• 卷排序：23

文摘

Highly ordered hexagonal meso-structured, vesicles, and mesoporous ordered siliceous foams have been elaborately synthesized in weak HCl solution under static conditions without any organic additives by finely tuning reaction pH (3.0–5.0) and/or the amount of adding sodium sulfate (Na₂SO₄). Lower pH value is favorable for hexagonal structure and higher pH value and Na₂SO₄ concentration is beneficial for vesicles and foams. Siliceous materials with different morphologies (rod, vesicle and foam), structures (hexagonal, vesicle and foam) and pore sizes were used for volatile organic compounds (VOCs) removal. The adsorption and desorption performance of hexagonal mesostructure (S1), vesicles (S5) and macroporous ordered siliceous (S7) samples were investigated under static (water vapor, n-hexane and 93# gasoline) and dynamic (n-hexane) conditions. Compared with S1, S5, commercial silica gel (SG) and activated carbon (AC), S7 shows higher static adsorption capacity of n-hexane and 93# gasoline, more stable breakthrough time and larger n-hexane adsorption capacity under dynamic adsorption conditions. The designed siliceous materials with high VOCs removal capacity and recyclability show great potential for VOCs controlling.