溶液酸度对四环素类物质光降解和光催化降解速率的影响

Effect of Solution pH on Photodegradation and Photocatalytic Degradation of Tetracyclines

摘要: 比较了四环素（TC）、土霉素（OTC）和金霉素（CTC）这3种四环素类物质在不同pH条件下的光降解和光催化降解速率。结果表明，在紫外光（UV）作用下3种四环素类物质的降解速率由高到低依次为OTC、CTC和TC，而在UV-TiO₂光催化体系下，pH值为3.0～7.0时3者的降解速率无明显差异；碱性条件有利于TC、OTC和CTC的光降解和光催化降解，且降解过程中有NH₄+生成。

Abstract: Comparisons were made between tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) in photodegradation and photocatalytic degradation in solutions different in pH. Results show that under UV light, they followed the order of OTC > CTC > TC in photodegradation rate. However, under UV- TiO₂ photocatalysis, they demonstrated little difference in solutions with pH in the range of 3.0-7.0 . Increasing solution pH facilitated both the photodegradation and photocatalysis degradation of TCs, and NH₄+ ions were generated during these processes.