Chatzitakis A, Berberidou C, Paspaltsis I, Kyriakou G, Sklaviadis T, Poulios I
Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Water Res. 2008 Jan;42(1-2):386-94. doi: 10.1016/j.watres.2007.07.030. Epub 2007 Jul 27.
The photocatalytic degradation of Chloramphenicol, an antibiotic drug, has been investigated in aqueous heterogeneous solutions containing n-type oxide semiconductors as photocatalysts. The disappearance of the organic molecule follows approximately a pseudo-first-order kinetics according to the Langmuir-Hinshelwood model. It was observed that, with TiO(2) P-25 as photocatalyst, quantitative degradation of the organic molecule occurs after 4h of illumination. During this time, the dechlorination of the substrate is complete, while the organic nitrogen was recovered in the form of nitrate and ammonium ions. The effect of temperature on the degradation rate of Chloramphenicol shows similar apparent activation energies for both TiO(2) P-25 and ZnO photocatalysts. The initial apparent photonic efficiency (zeta(0)) of the photo-oxidation and the mineralization under various experimental conditions have been calculated, while the Kirby-Bauer disc diffusion method showed a 100% reduction of the drug activity after 90 min of photocatalytic treatment.
已在含有n型氧化物半导体作为光催化剂的水相非均相溶液中研究了抗生素药物氯霉素的光催化降解。根据朗缪尔 - 欣谢尔伍德模型，有机分子的消失大致遵循准一级动力学。观察到，以TiO(2) P - 25作为光催化剂，光照4小时后有机分子发生定量降解。在此期间，底物的脱氯完成，而有机氮以硝酸根离子和铵离子的形式回收。温度对氯霉素降解速率的影响表明，TiO(2) P - 25和ZnO光催化剂的表观活化能相似。计算了各种实验条件下光氧化和矿化的初始表观光子效率（ζ(0)），而 Kirby - Bauer 纸片扩散法显示光催化处理90分钟后药物活性降低了100%。
