期刊
APPLIED SURFACE SCIENCE
卷 257, 期 22, 页码 9525-9531出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2011.06.054
关键词
Surface modification; ZSM-5; Alkyltrichlorosilane; Superhydrophobicity
类别
资金
- Major State Basic Research Program of China [2009CB623404]
- National Natural Science Foundation of China [20736003, 20906056]
- National High Technology Research and Development Program of China [2007AA06Z317, 2008EG111021]
- Foundation of Ministry of Education of China [20070003130]
- Postdoctor Science Foundation of China [023201069, 023201073]
ZSM-5 zeolites were modified with alkyltrichlorosilanes of various chain lengths (octyltrichlorosilane, decyltrichlorosilane, dodecyltrichlorosilane and hexadecyltrichlorosilane) and characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Thermal gravimetric analysis (TGA) and contact angle measurements (CA). The results showed that a closely packed and hydrophobic layer was presented at the particles surface and the surface wetting property varied from hydrophilic to hydrophobic, even to superhydrophobic. It was interesting to notice that the hydrophobic properties of modified ZSM-5 particles could be tuned by varying the chain length of chlorosilane and changing the pretreatment temperature before silanization. With increasing the alkyl chain length of trichlorosilane, the hydrophobicity increased. However, with an increase in the pretreatment temperature, the hydrophobicity decreased. Moreover, the relationship between the wetting properties and thermal stability was also investigated, the results showed that the modified ZSM-5 particles possessed good hydrophobicity at a temperature below 250 degrees C in air. These modified ZSM-5 particles may be utilized for many potential applications, such as membrane fillers, selective adsorbents, catalysts, chromatographic supports and so on. (C) 2011 Elsevier B. V. All rights reserved.
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