期刊
POWDER TECHNOLOGY
卷 203, 期 3, 页码 462-468出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2010.06.007
关键词
Nanosized-silica gel; Mesopore; Sol-gel method; Rice husk
资金
- National Metal and Materials Technology Center (MTEC) [MT-B-51-CER-07-206-I]
Silica gel has been synthesized by the refluxing of rice husk ash with 1 M NaOH and subsequently adjusting the pH using 1 M H2SO4. The high purity of the silica gel has been found to be dependent on: (i) reflux time, (ii) water loading by addition of boiling DI water to the silica gel prior to titration with 1 M H2SO4 and (iii) rinse time on removal of impurities prior to drying. The surface area, pore size and volume of the silica gel were measured; XRD peaks of Na2SO4 impurity were absent after rinsing >4 times. FTIR spectra showed that all the silica gels made by different schedules had a similar functional composition. The advantages of the present synthesis route are (i) a cost reduction due to the absence of pre-treatment for the rice husks before calcination below 700 degrees C, and (ii) the formation of a pure high surface area mesoporous amorphous silica gel. (C) 2010 Elsevier B.V. All rights reserved.
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