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首页> 外文期刊>Journal of Environmental Science and Health >Dechlorination of polychlorinated biphenyls in transformer oil using UV and visible light
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Dechlorination of polychlorinated biphenyls in transformer oil using UV and visible light

机译：使用紫外线和可见光对变压器油中的多氯联苯进行脱氯

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摘要

A study on dechlorination of PCB138 in transformer oil (TO) and 2-propanol (IPA) using 254 nm ultraviolet (UV) light as well as dye sensitized visible light has been conducted. Studies on dechlorination of polychlorinated biphenyls (PCBs) in TO using visible light in the presence of methylene blue (MB) and triethylamine (TEA) (providing a 'photocatalytic' cycle) in both deaerated and aerated conditions have been conducted to determine effects of TO, MB and TEA on reaction rates. The results show that photolytic methods are effective in treating PCBs in TO, and that the oil plays a limited adverse role. Under UV irradiation, PCB 138 can be ＞99% dechlorinated in the presence 0.06% (w/w) TO in IPA within 1 h with a rate constant of 0.0853 min~(-1), while 47% of PCB138 can be dechlorinated in 92.1% (w/w) TO in IPA within 2 h with a rate constant of 0.0051 min~(-1). In the 'photocatalytic' system, 94% reduction of PCB 138 was achieved within 30 min with a rate constant of 0.0968 min"1 when the solvent was 60.70% (w/w) TO in IPA, while 71% dechlorination of PCB138 was achieved within 30 min with a rate constant of 0.0382 min~(-1) when 81.62% (w/w) TO was present. In treatment of 30-73 ppm PCBs in TO, the optimal concentration of MB and TEA were found to be 0.5 g/L and 58.08 g/L respectively. Because of quenching by oxygen, deaeration of the solution is necessary for an efficient reaction. The photocatalytic system is especially adapted for treating lower concentration of PCBs in TO.
机译：已经进行了使用254 nm紫外线（UV）和染料敏化可见光对PCB138在变压器油（TO）和2-丙醇（IPA）中脱氯的研究。已经进行了在脱气和充气条件下在亚甲基蓝（MB）和三乙胺（TEA）存在下使用可见光在TO中对多氯联苯（PCBs）进行脱氯研究（提供“光催化”循环）的研究。 ，MB和TEA对反应速率的影响。结果表明，光解方法可有效处理TO中的PCB，并且油的不良作用有限。在紫外线照射下，PCB 138在IPA中以0.06％（w / w）的TO在1 h内可以> 99％脱氯，速率常数为0.0853 min〜（-1），而PCB138的47％可以在IPA中脱氯。 2 h内IPA中TO的含量为92.1％（w / w），速率常数为0.0051 min〜（-1）。在“光催化”系统中，当溶剂在IPA中的TO为60.70％（w / w）时，在30分钟内PCB 138的还原度为94968％“ 1，速率常数为0.0968 min” 1，而PCB138的脱氯率达到71％当TO存在于81.62％（w / w）时，在30分钟内的速率常数为0.0382 min〜（-1）。在TO中处理30-73 ppm PCBs时，MB和TEA的最佳浓度为0.5 g / L和58.08 g / L。由于氧气的淬灭，溶液的脱气对于有效反应是必要的，光催化系统特别适合处理TO中较低浓度的PCB。

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