International Postgraduate Programs in Environmental Management, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand.
J Environ Manage. 2011 Sep;92(9):2272-6. doi: 10.1016/j.jenvman.2011.04.016. Epub 2011 May 18.
Tungsten doping and hydrothermal treatment were found to significantly improve the visible-light photoactivity of TiO(2) synthesized by the sol-gel method. It was observed that TiO(2) doped with a 0.5% W:Ti mole ratio and treated with 4 h of hydrothermal curing showed photoactivity under blue light irradiation equal to 74% of the commercial Degussa P-25 under UV irradiation, i.e., 0.01 mM 2-chlorophenol was completely removed in 120 and 90 min, respectively. Light absorptivity and photocatalytic activity under blue light irradiation were not dependent on the crystallite structure of the TiO(2). The oxidation kinetics under blue light irradiation can be effectively explained by the Langmuir-Hinshelwood model with an apparent reaction rate constant and a Langmuir constant of 3.60 × 10(-4) mM min(-1) and 206.53 mM(-1), respectively.
掺杂钨和水热处理被发现可显著提高溶胶-凝胶法合成的 TiO(2)的可见光光活性。结果表明，掺杂摩尔比为 0.5% W:Ti 的 TiO(2)经 4 小时水热处理后，在蓝光照射下的光活性相当于在 UV 照射下商业 Degussa P-25 的 74%，即 0.01 mM 2-氯苯酚分别在 120 和 90 分钟内完全去除。蓝光照射下的光吸收和光催化活性不依赖于 TiO(2)的晶相结构。蓝光照射下的氧化动力学可以用 Langmuir-Hinshelwood 模型有效解释，表观反应速率常数和 Langmuir 常数分别为 3.60×10(-4) mM min(-1)和 206.53 mM(-1)。
