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NH;生成.%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.
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