Spectroscopy and Spectral Analysis, Volume. 29, Issue 8, 2166(2009)
Studies on Ag-TiO2/KIT-6 Composite Nanosized Photocatalyst
In the present paper, ordered mesoporous silica (KIT-6) as support, nanosized TiO2 into KIT-6 was synthesized by titanium tetraisopropoxide hydrolysis. Then silver was loaded by deposition-precipitation method. Ag-TiO2/KIT-6 composite nanosized photocatalyst was firstly synthesized and a series of correlated catalysts were synthesized by the same preparation method. Methyl orange is presently adopted as a representative organic pollutant to evaluate the photocatalytic performance of the as-synthesized catalysts. The order of photocatalytic activity of the as-synthesized samples was found as Ag-TiO2/KIT-6>Ag/TiO2>TiO2/KIT-6>TiO2>Ag/KIT-6. Detailed characterizations were conducted by techniques including XRD, N2 physical adsorption, XPS, UV-Vis DRS and TEM. It was found that the Ag-TiO2/KIT-6 sample shows the highest photocatalytic activity, which should be attributed to the Ag-TiO2 heterojunction structure and higher BET surface area of the Ag-TiO2/KIT-6 sample. Ag-TiO2 heterojunction improves the separation of photogenerated electron-hole pairs, thus enhancing the photocatalytic activity; Ag-TiO2/KIT-6 sample possesses high BET surface area, which facilitates adsorption and transportation of dye molecules, also leading to higher photocatalytic activity.
Get Citation
Copy Citation Text
ZHANG Feng-li, ZHENG Yuan-hui, ZHAN Ying-ying, LIN Xing-yi, ZHANG Han-hui, ZHENG Qi. Studies on Ag-TiO2/KIT-6 Composite Nanosized Photocatalyst[J]. Spectroscopy and Spectral Analysis, 2009, 29(8): 2166