Key Laboratory of Groundwater Resources and Environment, Ministry of Education Jilin University, Changchun 130021, China.
Water Sci Technol. 2011;64(4):841-7. doi: 10.2166/wst.2011.620.
The photochemistry of para-chlorophenol (4-CP) was studied under simulated sunlight (lambda > 300 nm) and UV irradiation by using a 125 W high-pressure mercury lamp with or without a hard glass as light source in an ice matrix. The experiments were carried out in a photochemical cold chamber reactor at -14 to -12 degrees C. The photoconversion rate, photoproducts and photoconversion mechanism of 4-CP were all inspected and compared. The results show that the 4-CP photoconversion obeys the first order kinetic model and its photoconversion rate is highly affected by the initial concentration of 4-CP, light intensity and water quality. It is found that the conversion rate of 4-CP under UV irradiation is higher than that under simulated sunlight irradiation. The intermediate products of 4-CP were characterized by GC-MS, HPLC-ESI-MS and HPLC techniques and the possible photoconversion mechanism was proposed accordingly. It is concluded that the mechanism and photoproducts of 4-CP photolysis in ice are different from those in water, and the photoproducts and photoconversion pathways of 4-CP in ice varied with different light sources.
对在模拟太阳光（lambda > 300nm）和紫外线辐照下的对氯苯酚（4-CP）的光化学进行了研究，使用带有或不带有硬玻璃的 125W 高压汞灯作为光源，在冰基质中进行。实验在-14 至-12 摄氏度的光化学反应冷室反应器中进行。检查并比较了 4-CP 的光转化速率、光产物和光转化机制。结果表明，4-CP 的光转化符合一级动力学模型，其光转化速率受 4-CP 的初始浓度、光强和水质的高度影响。发现紫外线辐照下 4-CP 的转化率高于模拟太阳光辐照下的转化率。通过 GC-MS、HPLC-ESI-MS 和 HPLC 技术对 4-CP 的中间产物进行了表征，并提出了可能的光转化机制。结论是，4-CP 在冰中的光解机制和光产物与在水中的不同，并且 4-CP 在冰中的光产物和光转化途径随不同的光源而变化。
