VOC adsorption and desorption behavior of hydrophobic, functionalized SBA-15
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o Wang Advanced Catalytic and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu 213164, People’s Republic of China
Lu Han Research and Development Center, China Tobacco Anhui Industrial Co., Ltd., Hefei, Anhui 230028, People’s Republic of China
Mei Tang and Jing Zhong Advanced Catalytic and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu 213164, People’s Republic of China
Weiqiu Huang Jiangsu Provincial Key Laboratory of Oil and Gas Storage and Transportation Technology, Changzhou University, Changzhou, Jiangsu 213016, People’s Republic of China
Ruoyu Chena) Advanced Catalytic and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, Jiangsu 213164, People’s Republic of China (Received 8 November 2015; accepted 19 January 2016)
Hydrophobic functionalized SBA-15 has been developed via postsynthesis modification with trimethylchlorosilane (TMCS) and used for volatile organic compounds (VOCs) removal. The adsorption and desorption performance of different SBA-15-TMCS under static and dynamic conditions were investigated. Experimental results indicated that all samples showed a highly ordered two dimensional hexagonal mesostructure, and the organic groups were chemically incorporated into the pore surface of SBA-15 substrate. Comparing with commercial silica gel and activated carbon, SBA-15-TMCS shows higher static adsorption capacities of n-hexane and 93# gasoline, good recyclability, lower water vapor adsorption capacity, higher dynamic adsorption capacity, and longer breakthrough time. The high adsorption efficiency and stability of SBA-15-TMCS are associated with their hydrophobic surface, uniform and large pore size, high surface area and pore volume. The designed SBA-15-TMCS with high VOC adsorption capacity and recyclability shows great potential for VOC removal.
I. INTRODUCTION
Emission of volatile organic compounds (VOCs) can cause air pollution and be harmful to human health at even very low concentration. Catalytic or thermal oxidation, adsorption, filtration, membrane separation, and condensation are common techniques to remove VOCs.1 Among all the treatments, adsorption is one of the preferred choices referring to the global shortage of resources. The operation is easy and the cost is low.2–5 Activated carbon (AC) is one of the most widespread adsorbents to eliminate the VOCs due to its developed Contributing Editor: Akira Nakajima a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.40
microporosity which ensures the high adsorption capacities.6 However, its application is limited by the sensibility to high temperature, difficult regeneration, and shortcomings of pore blocking and hygroscopicity.7 Hence, other better adsorbents are desirable to overcome these kinds of problems. Ordered mesoporous silica families of mesoporous crystalline material (MCM)-41,8 Santa Barbara amorphous material (SBA)-15,9 hexagonal mesoporous silica (HMS),10 and etc.
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