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Post‐Synthesis of Ti‐SBA‐15 in Supercritical CO 2 ‐Ethanol Solution
Author(s) -
Feng Ji,
An Guimin,
Chen Biaohua,
Li Yingxia,
Ding Kunlun,
Xie Yun,
Liu Zhimin
Publication year - 2009
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.200900030
Subject(s) - supercritical fluid , calcination , x ray photoelectron spectroscopy , sorption , materials science , transmission electron microscopy , chemical engineering , nanoparticle , phase (matter) , titanium , nuclear chemistry , adsorption , catalysis , nanotechnology , chemistry , metallurgy , organic chemistry , engineering
Ti‐SBA‐15 materials with Ti incorporated into the framework of SBA‐15 and controllable Ti contents were successfully prepared via a post‐treatment route in supercritical CO 2 ‐ethanol solution, followed by calcination. The resultant Ti‐SBA‐15 materials were characterized by means of different techniques including X‐ray diffraction, X‐ray photoelectron spectroscopy, transmission electron microscopy, IR analysis, and N 2 sorption analysis. It was demonstrated that the resultant materials retained a structure similar to that of the parent SBA‐15, and Ti was incorporated into the framework of SBA‐15. At high Ti content, i.e, Si/Ti = 5:1, a TiO 2 phase formed and was coated onto the inner surface of SBA‐15 in addition to the incorporation of the Ti in the framework. The BET surface areas of the Ti‐SBA‐15 samples decreased with increasing Ti content. The presence of small amounts of H 2 O in the reaction medium may have resulted in some TiO 2 nanoparticles being uniformly distributed in the pores of the SBA‐15 accompanying the incorporation of Ti in the SBA‐15 framework.