School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast, BT9 5AG, United Kingdom.
J Hazard Mater. 2012 Apr 15;211-212:182-7. doi: 10.1016/j.jhazmat.2011.07.116. Epub 2011 Aug 10.
A series of mesoporous films of titania of different thicknesses are prepared and their surface areas and porosities determined by physical adsorption using Kr as the adsorbate. The amounts of acid orange 7 (AO7) adsorbed by these films are found to be proportional to their measured surface areas and so the possibility of using this as a method of determining the surface area of thin titania films is discussed. The initial rates of UV-driven photocatalytic- and visible-driven photosensitised-bleaching of AO7 in solution, upon UVA and visible light irradiation, respectively, are also directly dependent upon the measured surface areas of the titania films. The quantum efficiencies for the UV photocatalytic- and visible photosensitised-bleaching of AO7 by the thickest of the AO7 films were estimated to be 0.08 and 0.01%, respectively.
一系列不同厚度的介孔二氧化钛薄膜被制备出来，并通过 Kr 作为吸附剂的物理吸附来测定其比表面积和孔隙率。发现这些薄膜对酸性橙 7（AO7）的吸附量与它们的实测比表面积成正比，因此讨论了将其作为测定薄二氧化钛薄膜比表面积的方法的可能性。在 UVA 和可见光照射下，分别在溶液中进行 UV 驱动光催化和可见驱动敏化漂白时，AO7 的初始反应速率也直接依赖于 TiO2 薄膜的实测比表面积。通过最厚的 AO7 薄膜对 AO7 的 UV 光催化和可见敏化漂白的量子效率估计分别为 0.08%和 0.01%。
