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

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Abstract

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.

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Acknowledgments

This work is supported by the National Science Foundations of China (21101017, 21571024, 21276029 and 51574044), Qing Lan Project of Jiangsu Province (No. SCZ1409700002), Jiangsu Province Science and Technology Support Program (BE2011651), Key University Science Research Project of Jiangsu Province (11KJA610002), Jiangsu Province 333 High Level Personnel Training Project of Scientific (BRA2015375) and Industry and Research Perspective in Jiangsu Province (BY2015027-01) and the Opening Fund from Provincial Key Laboratory of Oil & Gas Storage and Transportation Technology, Jiangsu, P. R. China (cy1201).

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Funding was provided by National Science Foundations of China (Grant Nos. 21101017, 21571024, 21276029, 51574044).

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  1. Advanced Catalytic and Green Manufacturing Collaborative Innovation Center, Changzhou University, 1 Gehu Road, Changzhou, 213164, Jiangsu, People’s Republic of China

    Hongning Wang, Tao Wang, Jing Zhong & Ruoyu Chen

  2. Provincial Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Xingyuan Road, Changzhou, 213016, Jiangsu, People’s Republic of China

    Hongning Wang & Weiqiu Huang

  3. Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, 4072, Australia

    Hongning Wang, Meihua Yu & Xiaodan Huang

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  1. Hongning Wang
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Wang, H., Wang, T., Yu, M. et al. Elaborate control over the morphology and pore structure of porous silicas for VOCs removal with high efficiency and stability. Adsorption 23, 37–50 (2017). https://doi.org/10.1007/s10450-016-9815-8

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