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Chlorophenolic Compounds Degradation Based on Electrolyte-Free Electrochemical Cells
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1021/acssuschemeng.8b00720 Jie Teng 1 , Jinna Zhang 1 , Xiuheng Wang 1 , Shijie You 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-14 00:00:00 , DOI: 10.1021/acssuschemeng.8b00720 Jie Teng 1 , Jinna Zhang 1 , Xiuheng Wang 1 , Shijie You 1
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To eliminate the requirement for inorganic salt in electrochemical processes, the present study reports the use of ion-exchange resin (IX) matrix to conduct H+ or OH– produced during electrolysis for electrochemical degradation of refractory organic pollutants via the generation of reactive oxygen species at room temperature. The results demonstrated that, with the increase in applied voltage over the range of 0–30 V, there was almost no response of current for deionized water as well as chloromethylated bead due to the lack of free mobile ions. On the contrary, both cation exchange resin (CX) and anion exchange resin (AX) showed comparable current response to voltage as sodium sulfate electrolyte. In the absence of salt addition, the CX or AX could achieve effective degradation of 2,4-dichlorophenol (2,4-DCP), accounting for degradation efficiency higher than 97% after 90 min at current density of 5 mA/cm2. The performances of IX-based electrochemical system decreased slightly after 20 cycles of experiments, indicating good stability of IX during electrochemical degradation. This study provides a proof-of-concept demonstration of an effective ion-conductive material for low-conductivity water or wastewater decontamination using electrochemical technology, making low-conductivity water treatment more economical and more sustainable.
中文翻译：
基于无电解质电化学电池的氯酚类化合物降解
为了消除在电化学过程对于无机盐的要求，目前的研究报道了使用离子交换树脂（IX）矩阵进行ħ +或OH -在电解过程中产生的用于通过在室温下生成活性氧来降解难降解有机污染物的方法。结果表明，随着施加电压在0-30 V范围内的增加，由于缺乏游离的移动离子，去离子水以及氯甲基化磁珠几乎没有电流响应。相反，阳离子交换树脂（CX）和阴离子交换树脂（AX）都显示出与硫酸钠电解质相当的电流响应电流。在不添加盐的情况下，CX或AX可以实现2,4-二氯苯酚（2,4-DCP）的有效降解，这说明在电流密度为5 mA / cm 2的情况下，经过90分钟后，降解效率高于97％。。经过20个循环的实验，基于IX的电化学系统的性能略有下降，表明IX在电化学降解过程中具有良好的稳定性。这项研究提供了使用电化学技术对低电导率水或废水进行去污的有效离子导电材料的概念验证，使低电导率水处理更经济，更可持续。
更新日期：2018-03-14
中文翻译：
基于无电解质电化学电池的氯酚类化合物降解
为了消除在电化学过程对于无机盐的要求，目前的研究报道了使用离子交换树脂（IX）矩阵进行ħ +或OH -在电解过程中产生的用于通过在室温下生成活性氧来降解难降解有机污染物的方法。结果表明，随着施加电压在0-30 V范围内的增加，由于缺乏游离的移动离子，去离子水以及氯甲基化磁珠几乎没有电流响应。相反，阳离子交换树脂（CX）和阴离子交换树脂（AX）都显示出与硫酸钠电解质相当的电流响应电流。在不添加盐的情况下，CX或AX可以实现2,4-二氯苯酚（2,4-DCP）的有效降解，这说明在电流密度为5 mA / cm 2的情况下，经过90分钟后，降解效率高于97％。。经过20个循环的实验，基于IX的电化学系统的性能略有下降，表明IX在电化学降解过程中具有良好的稳定性。这项研究提供了使用电化学技术对低电导率水或废水进行去污的有效离子导电材料的概念验证，使低电导率水处理更经济，更可持续。
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