AI Article Synopsis
- The study analyzes the photodegradation of five different PCBs in a solution of acetonitrile and water, focusing on how their chlorination pattern affects their degradation.
- PCBs without chlorine on ortho-positions are more planar, leading to slower degradation when exposed to light, while those with ortho-chlorine atoms have a nearly perpendicular structure, resulting in faster degradation.
- The introduction of nano-TiO(2) and H(2)O(2) enhances the degradation rates of planar PCBs significantly, especially with H(2)O(2) speeding up the process by over 20 times, suggesting a sustainable method for PCB cleanup using sunlight and H(2)O(2).
Article Abstract
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.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2996220 | PMC |
| http://dx.doi.org/10.3390/ijerph7113987 | DOI Listing |
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