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首页> 外文期刊>Journal of Photochemistry and Photobiology, A. Chemistry >Dechlorination of pulp bleaching plant E-1 effluent by ArF* and KrF* excirner laser photolysis. Part 1. Dechlorination of chlorophenols identified in E-1 effluent
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Dechlorination of pulp bleaching plant E-1 effluent by ArF* and KrF* excirner laser photolysis. Part 1. Dechlorination of chlorophenols identified in E-1 effluent

机译：ArF *和KrF *准分子激光光解法对纸浆漂白厂E-1废水进行脱氯。第1部分。E-1废水中鉴定出的氯酚的脱氯

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Among the chlorophenols identified in the bleaching plant E-1 effluent, 4,5-chloroguaiacol (2), 3,4,5,6-tetrachloroguaiacol (3), 2,4,6-trichlorophenol (4) and 2,3,4,5-chlorophenol (5) were selected as model compounds for dechlorination at pH 7 and 10.5 in nitrogen- and oxygen-saturated aqueous solutions at 20° C by ArF* (193 nm) and KrF* (248 nm) excimer laser photolyses. The ArF* (193 nm) excimer laser photolysis was more effective than the KrF* (248 nm) excimer laser photolysis in dechlorinating 2-5. The dechlorinations of 2-5 were determined to be first order reactions; first order with respect to total organically bound chlorine of substrate, first order overall. The efficiency of dechlorination was found to depend on the initial pH of reaction mixture, substituent pattern of 2-5, and the wavelength of excimer laser radiation. The dechlorination rates of chlorinated guaiacols 2 and 3 were faster than the chlorinated phenols 4 and 5 under the same reaction condition while rate of 3 was faster than that of 2. Furthermore, the dechlorination rate of a substrate increased with increasing initial pH. The dechlorination rates of chlorophenols investigated were almost the same in N-2- and O-2-saturated solutions. However, when 2% H2O2 per substrate was added to the initial reaction mixture of 5 in the ArF* (193 nm) excimer laser photolysis, the dechlorination rate increased considerably. Quantum yields (φ) for the generation of chloride ions were determined for the ArF* (193 nm) and KrF* (248 nm) excimer laser photolyses of 2-5 in both N-2- and O-2-saturated solutions. In general, the quantum yields in O-2-saturated solutions were slightly higher than the corresponding values in N-2-saturated solutions and was increased appreciably with addition of 2% H2O2. © 2004 Elsevier B.V. All rights reserved.
机译：在漂白厂E-1废水中鉴定出的氯酚中，有4,5-氯愈创木酚（2），3,4,5,6-四氯愈创木酚（3），2,4,6-三氯酚（4）和2,3，选择4,5-氯苯酚（5）作为模型化合物，在pH为7和10.5的氮气和氧气饱和的水溶液中于20＆DEG下进行脱氯; C通过ArF *（193 nm）和KrF *（248 nm）准分子激光进行光解。在2-5脱氯中，ArF *（193 nm）准分子激光光解比KrF *（248 nm）准分子激光光解更有效。 2-5的脱氯反应被确定为一级反应。相对于底物的总有机结合氯为一阶，整体为一阶。发现脱氯的效率取决于反应混合物的初始pH，2-5的取代基图案和准分子激光辐射的波长。在相同的反应条件下，氯愈创木酚2和3的脱氯速率比氯酚4和5快，而3的脱氯速率却比2快。此外，底物的脱氯速率随初始pH的增加而增加。在N-2-和O-2-饱和溶液中，所研究的氯酚的脱氯速率几乎相同。但是，当在ArF *（193 nm）受激准分子激光光解中，将每个基板2％的H2O2添加到5的初始反应混合物中时，脱氯速度会大大提高。确定了在N-2-和O-2-饱和溶液中2-5的ArF *（193 nm）和KrF *（248 nm）准分子激光光解产生氯离子的量子产率（φ）。通常，O-2-饱和溶液中的量子产率略高于N-2-饱和溶液中的相应产率，并通过添加2％H2O2显着提高。 ＆复制; 2004 Elsevier B.V.保留所有权利。

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