Degradation of Brilliant Crocein wastewater by double-rod dielectric barrier discharge

doi:10.16085/j.issn.1000-6613.2017-2630

Abstract

Abstract: A double-rod dielectric barrier discharge (DBD) was applied to degrade the Brilliant Crocein under different parameters, including energy density, initial conductivity, initial pH, and initial mass concentration and standing time. The active particles such as H₂O₂ and O₃ were detected as well. The UV-vis absorption spectra indicated the N=N and naphthalene ring of the Brilliant Crocein were destroyed. The degradation rate increased with the increase of energy density. The degradation rate reached 70.0% with the energy density of 265.8kJ/L, and the corresponding energy efficiency was up to 2.84mg/(kW·h). The energy efficiency improved when the initial mass concentration increased. The yield of hydrogen peroxide was higher with a longer discharge time, and the persistent effects on the degradation of Brilliant Crocein still existed after discharge. However, the ozone increased first and then decreased.

Key words: dielectric barrier discharge (DBD), plasma, waste water, Brilliant Crocein, pollution, oxidation

摘要： 研究一种双杆式介质阻挡放电在不同条件下对酸性红73的降解效果，考察了能量密度、初始电导率、初始pH、初始质量浓度和放置时间等因素对染料降解率的影响，并对反应中生成的活性粒子（H₂O₂和O₃）进行了检测。降解实验前后的紫外-可见吸收光谱图表明介质阻挡放电能够破坏酸性红73分子中的偶氮双键和萘环等。实验结果表明：能量密度的增加可以提高酸性红73降解率，当能量密度为265.8kJ/L时，降解率为70.0%，能量效率最高可达2.84mg/（kW·h）。酸性红73的初始质量浓度的增加可以提高反应的能量效率。放电过程中产生的过氧化氢与处理时间呈正相关增长，并可持续存在一段时间进一步引起染料褪色，臭氧则随着时间的增长先增大后减小。

关键词: 介质阻挡放电, 低温等离子体, 废水, 酸性红73, 污染, 氧化

CLC Number:

LIU Dan, ZHANG Liancheng, HUANG Yifan, ZHU Anna, LIU Zhen, YAN Keping. Degradation of Brilliant Crocein wastewater by double-rod dielectric barrier discharge[J]. Chemical Industry and Engineering Progress, 2018, 37(09): 3640-3648.

刘丹, 张连成, 黄逸凡, 朱安娜, 刘振, 闫克平. 双杆介质阻挡放电降解酸性红73废水[J]. 化工进展, 2018, 37(09): 3640-3648.

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