1 School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China
Abstract: Volatile organic compounds (VOCs) emissions generate severe hazards to the natural environment and human health. As one of the common methods for VOCs treatment, adsorption has drawn extensive concern with its preponderance of low cost, high efficiency, recyclability and reusability. Meanwhile, mesoporous molecular sieves are considered as good candidates for adsorption material due to their distinguished characteristics of highly ordered pore structure, large specific surface area and pore volume as well as ease of functionalization, which has triggered the recent interest of researchers. Some studies show that as common VOCs adsorbents, M41S, SBA, HMS and other silicon-based materials have excellent adsorption properties. The adsorption performance of mesoporous silicon-based molecular sieves is not only related to the pore structure of materials, but also affected by the macroscopic morphology characteristics of molecular sieves and other factors. For example, the structure improvement of mesoporous molecular sieve by introducing micropores to synthesize micro-mesoporous composite structural materials can not only improve the diffusion effect of adsorption process, but also solve the problem of single structure of molecular sieve pores, which can improve the adsorption performance of materials and enhance their hydrothermal stability. In addition, in terms of the macroscopic morphology of the same molecular sieve, the longer the pore structure is, the more conducive it is to the diffusion and adsorption of VOCs molecules. On the other hand, water vapor is often contained in VOCs gases in practical industrial activities. Due to its hydrophilic properties, mesoporous silicon molecular sieves have limited in industrial applications. Therefore, in recent years, in addition to researching on the relationship between mesoporous silica molecular sieve absorption ability of VOCs and the structure and morphology of them, the researchers conduct the thorough research on the main environment on the surface of molecular sieves. By the method of grafting and co-condensation and other modified way of molecular sieve, researchers managed to enhance their adsorption performance in wet conditions. In this paper, recent accomplishments and advances of the adsorption studies on meso-porous molecular sieve used for VOCs removal have been summarized in detail. In the meantime,the influence factors of molecular sieve structure, morphology and surface environment on adsorption performance are introduced, the characteristics of mesoporous molecular sieve with excellent adsorption VOCs capability are summarized, the limitations of adsorption VOCs process are pointed out.Moreover, improvement of adsorption capacity by hydrophobic modification was discussed and the future research work is prospected.
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2020, Vol. 34 
