Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (1): 51-57.DOI: 10.11944/j.issn.1000-0518.2019.01.180069

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Synthesis of Ordered Supermicroporous Silica Using Short-Chain Quaternary Ammonium/Fatty Acid Salts as Template

WANG Renliang,ZHU Yanmei(),JI Haiwei   

  1. School of Chemistry and Pharmaceutical Engineering,Taishan Medical University,Taian,Shangdong 271016,China
  • Received:2018-03-13 Accepted:2018-06-07 Published:2019-01-01 Online:2019-01-04
  • Contact: ZHU Yanmei
  • Supported by:
    Supported by the Foundation of Key Laboratory of Colloid and Interface Chemistry(Shandong University), Ministry of Education(No.201407), Foundation for High-Level Project Development(No.2015GCC19), Science and Technology Research Program for Colleges and Universities(No.J17KB072)

Abstract:

Supermicroporous materials possess pore size of 1~2 nm. They are expected to exhibit size- and shape-based separation/catalytic applications, which plays important role in modern industry. It is challenging to find an economic/simple surfactant system for the synthesis of supermicroporous materials. In this work, supermicroporous silica was synthesized using short-chain quaternary ammonium salt(decyltrimethyl ammonium bromide, denoted C10TAB) surfactant system mixed with fatty acid salts as the templating agents. The samples were characterized by small-angle X-ray diffraction(XRD), N2 adsorption-desorption, Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results indicate that the length of alkyl chain in co-surfactant, the dosage amount, crystallization temperature have great effects on the regularity of the pore structure. We can obtain highly ordered supermicroporous silica when using sodium octanoate(denoted SO) as co-surfactant in the molar ratio of n(C10TAB):n(Na2SiO3):n(SO):n(H2O)=1:1.5:0.3:800, at the crystallization temperature of 80 ℃. The calcinated materials possess surface area 1300 m2/g and pore volume 0.49 cm3/g with a pore size distribution centered at about 1.90 nm.

Key words: supermicroporous silcia, short-chain quaternary ammonium salt, fatty acid salts, micellar, mixed surfactants system