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首页> 外文期刊>International Journal of Environmental Research and Public Health >Photodegradation of Selected PCBs in the Presence of Nano-TiO2 as Catalyst and H2O2 as an Oxidant
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Photodegradation of Selected PCBs in the Presence of Nano-TiO2 as Catalyst and H2O2 as an Oxidant

机译：纳米TiO2作为催化剂和H2O2作为氧化剂的选择性PCB的光降解。

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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-TiO2 speeds up the degradation of the planar PCBs, but slows down the degradation of the non-planar ones. The use of H2O2 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 H2O2 in combination with sunlight irradiation could be an efficient and “green” technology for PCB remediation.
机译：在乙腈/水80:20中对五种策略选择的PCB进行光降解。量子化学计算表明，邻位不含氯的PCBs更接近于平面，而邻位具有至少一个氯原子的PCBs使两个苯环几乎垂直。光诱导的平面PCB的降解比垂直PCB慢得多。纳米TiO2的使用加速了平面PCB的退化，但减慢了非平面PCB的退化。 H2O2的使用可大大加快平面PCB的降解速度（> 20倍），但对除2,3,5,6-TCB外的非平面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。将H2O2与阳光照射结合使用可能是一种高效且“绿色”的PCB修复技术。

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