期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 7, 期 11, 页码 3987-4001出版社
MDPI AG
DOI: 10.3390/ijerph7113987
关键词
photodegradation; PCBs; H2O2; dechlorination; TiO2
资金
- DoD [W912HZ-06-C-0057]
- NIH-NCRR
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 approximate to 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.
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