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Tuning and modifying the?pore structure of ceramic hollow fiber?via silica gel
Authors： SUN He1, LI Lin1, XU Ruisong1,HONG Zhou2,GU Xuehong2,WANG Tonghua1,*
Units： 1.State Key Laboratory of Fine Chemicals, Carbon membrane and porous carbon materials research group, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
KeyWords： silica gel; gas separation; ceramic hollow fiber; pore structure
ClassificationCode：TQ028.8
year,volume(issue):pagination： 2020, 40(6):22-28

Abstract：

Taking tetraethyl orthosilicate (TEOS) as the silicon source, EtOH as the co-solvent, and HCl as the catalyst, he pore structure of the ceramic hollow fiber is filled and regulated by means of the silica gel of the framework structure. The effects of sol ratio, environmental humidity and additives on the gas flux and micropore structure of ceramic hollow fiber were studied. The results show that the modification of the silica gel can significantly improve and regulate the pore structure of the ceramic hollow fiber. The proportion of sol has a great influence on the stability of the sol system and the modification effect of the ceramic hollow fiber. Increasing the environmental humidity can effectively prevent the gel from cracking and the collapse of the framework structure. Introduction of additives can improve the gel and drying process, optimize the gel The microstructure of the body and ceramic hollow fiber. The pore diameter of the ceramic hollow fiber modified by silica gel is reduced and uniformized, the distribution range of concentrated pores is reduced from 0.24-0.32μm to 0.14-0.18μm, and the content of pores with diameter d>0.2μm decreased from 37.7% to 4.1%, and has N2 gas flux up to 13570GPU.

Funds：
国家重点研发计划(2017YFB0603403)；国家自然科学基金(21436009，21878033)

AuthorIntro：
孙赫（1994-），男，山东临沂人，硕士生，从事膜材料的研究.

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