紫外光激活过硫酸盐降解水中三氯生

Degradation of Triclosan in Water by Ultraviolet Light-activated Persulfate Process

摘要: 利用紫外光（UV）激活过硫酸盐（PS）的高级氧化技术降解水中三氯生。研究了紫外光照强度、PS投加量、初始pH值、共存阴离子(Cl^-、CO₃^2-)和腐殖酸（HA）对三氯生降解效果的影响。实验结果表明:增强紫外光强度、提高PS投加量可提高TCS降解率;酸性条件有利于TCS降解;水中Cl^-、CO₃^2-和NOM的存在均对TCS的降解具有抑制作用。初始TCS浓度为5.0mg/L,紫外光照强度I₀=9.94 m W/cm²,PS浓度为0.6 mmol/L,初始pH值为7.0,反应时间为120min时,TCS降解率达到96.6%。

Abstract: Ultraviolet light-activated persulfate（ UV/PS） was studied to degrade TCSin water. The effects of UV-light intensity,PS concentration,initial pH value,coexisting anions( Cl^-,CO₃^2-) and humic acid（ HA） on degradation of TCS were studied. The results revealed that higher UV-lightintensity and PS concentration could enhance the reaction. Acidity condition was conducive to the TCS degradation. The degradation of TCS was a little inhibited by Cl^-,CO₃² -and HA. When the initial concentration of TCS was 5. 0 mg/L,UV-light intensity（I₀）was 9. 94 m W/cm²,PS concentration was 0. 6 mmol/L,the initial pH value is 7. 0,and reaction time was 120 min,the degradation rate of TCS in water reached 96. 6%.