Cu2+对UV-nTiO2光催化降解抗生素的影响研究

Cu2+是环境中常见二价金属离子,但其对光催化降解抗生素废水的影响有待探明.为此,构建UV-nTiO2体系并探究Cu2+共存下三类抗生素(磺胺类抗生素、氯霉素类抗生素及四环素类抗生素)的光催化降解特性.结果表明,Cu2+可显著影响抗生素光催化降解且呈"低浓度促进,高浓度抑制"效应.当Cu2+浓度介于0.001～0.03...

EFFECTS OF Cu2+ ON ANTIBIOTIC DEGRADATION IN UV-nTiO2 PHOTOCATALYSIS SYSTEM

Cu²⁺ is a common divalent metal ion in the environment, but the effects of Cu²⁺ on antibiotic degradation in photocatalysis system remain unclear. Therefore, the photocatalytic degradation characteristics of three kinds of antibiotics (sulfonamides, chloramphenicols and tetracyclines) after the addition of 0~0.1 mol/L Cu²⁺ were investigated in UV-nTiO₂ photocatalytic system. The results showed that the degradation of antibiotics can be markedly affected by the addition of Cu²⁺ and the phenomenon can be described as " low concentration promotion, high concentration inhibition ". In detail, when the Cu²⁺ concentration ranged from 0.001 to 0.03 mol/L, the half-life (T0.5) of antibiotic degradation can be reduced to 15~90%; when the concentration of Cu²⁺ was between 0.01~0.1 mol/L, the degradation half-life (T_0.5) increased from 1.5 to 4 times as the control. Furthermore, the function of sine can describe the effects of Cu²⁺ on the degradation of antibiotics, and the correlation coefficient values were above 0.905. Moreover, the different effects of metal ions on the photo-degradation of antibiotics can be partially explained by the structural features of antibiotics (P < 0.05).