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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Degradation of 2,4-dichorophenol by pulsed high voltage discharge in water
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Degradation of 2,4-dichorophenol by pulsed high voltage discharge in water

机译：脉冲高压放电在水中降解2,4-二氯苯酚

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摘要

2,4-dichorophenol (2,4-DCP) was degraded in a pulsed high voltage discharge system with particular focus on the optimum of processing parameters and identification of the intermediate products. By increasing peak voltage or frequency, the 2,4-dichorophenol degradation could be sped up. The energy input was mounted up from 0.0057 to 0.0397 kWh and 2,4-DCP degradation efficiency was enhanced from 58% to 99% in 42 min by increasing peak voltage from 18 kV to 26 kV. Under the same 2,4-DCP degradation efficiency, less energy input was required for higher pulse frequency with a shorter discharge time. Higher pH value was advantage for 2,4-DCP degradation while salt content was proved to have little effect on 2,4-DCP degradation in the present discharge reactor. From the identifications of main intermediates resulted from 2,4-DCP degradation, it is illustrated that the degradation is induced by ·OH, which could mainly attack the Ortho-position of the OH group to form 3,5-dichloro-l,2-benzenediol or substitute the Cl group in 2,4-DCP to produce 2-chlorohydroquinone. The 2-chlorohydroquinone could be further reacted with ·OH to produce 1,2,4-trihydyoxybenzene. Additional, some ring-opened products such as (e,e)-2,4-hexadienal, formic, oxalic, maleic and d-( + )-malic acid were recognized by GC-MS and Ion Chromatograph detection.
机译：2,4-二氯苯酚（2,4-DCP）在脉冲高压放电系统中被降解，尤其着重于工艺参数的优化和中间产物的鉴定。通过增加峰值电压或频率，可以加快2,4-二氯苯酚的降解。通过将峰值电压从18 kV增加到26 kV，在42分钟内将能量输入从0.0057 kWh提高到0.0397 kWh，并将2,4-DCP降解效率从58％提高到99％。在相同的2,4-DCP降解效率下，较高的脉冲频率和较短的放电时间需要较少的能量输入。较高的pH值对于2，4-DCP的降解是有利的，而盐含量被证明对本放电反应器中的2，4-DCP的降解几乎没有影响。通过鉴定由2,4-DCP降解产生的主要中间体，可以说明降解是由·OH诱导的，它可以主要攻击OH基团的邻位形成3,5-dichloro-1,2。 -苯二醇或取代2,4-DCP中的Cl基以生成2-氯氢醌。该2-氯氢醌可以进一步与·OH反应生成1,2,4-三羟基苯。另外，通过GC-MS和离子色谱检测器可以识别出一些开环产物，例如（e，e）-2,4-己二酸，甲酸，草酸，马来酸和d-（+）-苹果酸。

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