Synthesis of MCM-41 from coal fly ash by a green approach: influence of synthesis pH

Journal of Hazardous Materials
K S Hui, C Y H Chao

Abstract

The present study reports a green synthesis method for preparing pure (free of fly ash) and ordered MCM-41 materials from coal fly ash at room temperature (25 degrees C) during 24 h of reaction. It was shown that the impurities in the coal fly ash were not detrimental to the formation of MCM-41 at the tested conditions. The influence of initial synthesis pH on material properties of calcined MCM-41 samples was investigated by various techniques such as XRF, XPS, XRD, FTIR, DR-UV-vis, solid state NMR, N2 physisorption, TG-DTA, SEM and TEM. The experimental results showed that the amount of trace elements such as Al, Na, Ti and Fe incorporated into the sample increased with synthesis pH value. More aluminum species were incorporated with tetrahedral coordination in the framework under a high pH value. The particle size of the sample decreased with the synthesis pH value. Samples synthesized at high pH values had a larger pore size and were more hydrothermally stable than those at low pH values. From thermal analysis, it was observed that the synthesized MCM-41 samples showed a high thermal stability. These properties made the synthesized MCM-41 suitable for further processing into more useful materials in a wide range of applicat...Continue Reading

Citations

Mar 26, 2013·Environmental Science & Technology·Liang-Yi Lin, Hsunling Bai
Jan 6, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Girish Kumar GuptaRafael Luque
Oct 25, 2016·Ecotoxicology and Environmental Safety·Ashim Kumar BasumataryG Pugazhenthi
Feb 15, 2013·Chemical Society Reviews·Corine GérardinBénédicte Lebeau
Sep 3, 2019·Frontiers in Chemistry·Denise SchneiderDirk Enke
Aug 8, 2020·Journal of Hazardous Materials·Mirza Mahmood BaigMuhammad Farooq Warsi
Dec 17, 2008·Environmental Science & Technology·C W KwongM P Wan

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