Study on the Photocatalytic Degradation of Microcystins by Using UV/Fenton/TiO_2

ZHANG Wei et al (Guizhou Key Laboratory of Water Pollution Control & Resource Reuse,Guiyang,Guizhou 550002)

UV/Fenton/TiO2;Photocatalytic degradation;Microcystins

[Objective] The paper aimed to study on the effects of MC-RR and MC-LR of photocatalytic degradation of Microcystins by using UV/Fenton/TiO2 in depth lake water. [Method ] Fenton-TiO2 as a photocatalyst,the influence of different reaction time,initial pH value,H2O2 concentration,Fe2+ concentration,TiO2 dosage,light intensity,initial concentration of Microcystin on UV/Fenton/TiO2 heterogeneous photocatalytic degradation of Microcystin were explored,and comparison of removal effects between heterogeneous photocatalytic degradation and UV photolysis to Microcystin. [Result] Under the conditions that the initial concentration of H2O2 was 0.1 mmol/L,[H2O2]/[FeSO4] was 15∶1,pH value was 4.0,the distance between the reaction solution and UV lamp tube was 1 cm,TiO2 dosage was 0.05 g/L,reaction temperature was (16±2) ℃,and after 3 minutes reacting,the removal rate of MC-RR with 0.35 mg/L concentration and MC-RR with 0.35 mg/L concentration can be reached 91.5% and 90.2% respectively. [Conclusion] UV/Fenton/TiO2 photocatalytic oxidation was proved to be effective degradating Microcystins.