Department of Chemistry and Biochemistry, Jackson State University, 1400 J. R. Lynch Street, P.O. Box 17910, Jackson, MS 39217, USA.
Int J Environ Res Public Health. 2010 Nov;7(11):3987-4001. doi: 10.3390/ijerph7113987. Epub 2010 Nov 15.
Photodegradation of five strategically selected PCBs was carried out in acetonitrile/water 80:20. Quantum chemical calculations reveal that PCBs without any chlorine on ortho-positions are closer to be planar, while PCBs with at least one chlorine atoms at the ortho-positions causes the two benzene rings to be nearly perpendicular. Light-induced degradation of planar PCBs is much slower than the perpendicular ones. The use of nano-TiO(2) speeds up the degradation of the planar PCBs, but slows down the degradation of the non-planar ones. The use of H(2)O(2) speeds up the degradation of planar PCBs greatly (by >20 times), but has little effect on non-planar ones except 2,3,5,6-TCB. The relative photodegradation rate is: 2,2',4,4'-TCB > 2,3,5,6-TCB > 2,6-DCB ≈ 3,3',4,4'-TCB > 3,4',5-TCB. The use of H(2)O(2) in combination with sunlight irradiation could be an efficient and "green" technology for PCB remediation.
在乙腈/水 80:20 中进行了 5 种战略选择的 PCB 的光降解。量子化学计算表明，没有任何氯在邻位的 PCB 更接近平面，而至少有一个氯原子在邻位的 PCB 导致两个苯环几乎垂直。平面 PCB 的光诱导降解比垂直的 PCB 慢得多。使用纳米 TiO(2)加速了平面 PCB 的降解，但减缓了非平面 PCB 的降解。使用 H(2)O(2)大大加速了平面 PCB 的降解（超过 20 倍），但除 2,3,5,6-TCB 外，对非平面 PCB 几乎没有影响。相对光降解速率为：2,2',4,4'-TCB > 2,3,5,6-TCB > 2,6-DCB ≈ 3,3',4,4'-TCB > 3,4',5-TCB。H(2)O(2)与阳光照射联合使用可能是 PCB 修复的一种有效且“绿色”的技术。
