Abstract
A method to prepare silica-titania aerogel-like balls (STABs) with photocatalytic activity was reported. Silica-titania sol was prepared by mixing self-made titania sol with commercial silica sol. Silica-titania gel balls were prepared by ball-dropping method (BDM) and sol-gel process. The mechanical strength of gel balls is obviously improved by immersing them in TEOS/alcohol solution before the start of gel drying procedure. These strengthened wet gel balls were dried at ambient pressure and STABs with small shrinkage were obtained. Characters of porous structures of STABs were characterized by transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET) method. STABs also display excellent photocatalytic activity for the degradation of methylene blue as a simulated aqueous organic pollutant in waste water.
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References
Itoh M, Hattori HK, Tanabe K (1974) J Catal 35:225
Hutter R, Mallat T, Baiker A (1995) J Catal 153:177
Stakheev AY, Shpiro ES, Apijok J (1993) J Phys Chem 97:5668
Reddy BM, Reddy EP, Manohar B (1993) Appl Catal 96:L1
van Grieken R, Aguado J, López-Munoz MJ, Marugán J (2002) J Photochem Photobiol A 148:315
Fu X, Clark LA, Yang Q, Anderson MA (1996) Environ Sci Technol 30:647
Dutoit DCM, Schneider M, Baiker A (1995) J Catal 153:165
Jung KY, Park SB (1999) J Photochem Photobiol A 127:117–122
Hung CH, Katz JL (1992) J Mater Res 7:1861
Malinowska B, Walendziewski J, Robert b D, Weber JV, Stolarski M (2003) Appl. Catalysis B: Environ 46:441–451
Deng Z et al (1999) Nano-Structured Mater 11(8):1313
Gan L, Wang Y, Hao Z, Xu Z, Chen L (2005) Chin J Chem Eng 13(6):758–763
Acknowledgments
The author is grateful to Hu huikang and Yang Huici for the BET investigation. The research work was also assisted by Tongji University Science Foundation (No. 1380219062).
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Xu, Z., Gan, L., Jia, Y. et al. Preparation and characterization of silica-titania aerogel-like balls by ambient pressure drying. J Sol-Gel Sci Technol 41, 203–207 (2007). https://doi.org/10.1007/s10971-006-1500-z
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DOI: https://doi.org/10.1007/s10971-006-1500-z