Electrooxidation of polar benzotriazole - The impact of supporting electrolyte

H. Prosen, Jernej Markelj, Stefan Vranješ, Tijana Đuričić, B. Malinovic, Eva Korenčić
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引用次数: 2

Abstract

Polar benzotriazoles are heterocyclic compounds widely used in industry, and as such are easily released into the environment. These compounds show harmful and toxic effects on plants and some aquatic organisms, biodegrade quite slowly, and some, depending on the structure, have the ability to bioaccumulate. They can only be partially removed by conventional wastewater treatment, and are therefore found in a variety of waters, as well as solid waste. In this paper, synthetic wastewater containing polar benzotriazole was treated by an electrooxidation process. The efficiency of the treatment was tested depending on various parameters, such as: anode material (mixed metal oxide - MMO and boron-doped diamond - BDD), applied current density (10 and 20 mA/cm2), type of supporting electrolyte (NaCl, Na2CO3, Na2SO4, H2SO4) and treatment time (0.5 - 2.5 h). Obtained results showed the treatment was more effective at higher current density and by using BDD anode. Also, the efficiency of the treatment increases with the prolongation of the electrolysis time. After 2.5 h of treatment, 97.9% of benzotriazole was removed, in the presence of sulfuric acid as supporting electrolyte.
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极性苯并三唑的电氧化-支持电解质的影响
极性苯并三唑是工业上广泛使用的杂环化合物,因此很容易释放到环境中。这些化合物对植物和一些水生生物具有有害和毒性作用,生物降解相当缓慢,并且根据结构的不同,有些化合物具有生物积累的能力。它们只能通过常规废水处理部分去除,因此存在于各种水和固体废物中。采用电氧化法对含极性苯并三唑的合成废水进行了处理。根据负极材料(混合金属氧化物- MMO和掺硼金刚石- BDD)、外加电流密度(10和20 mA/cm2)、支撑电解质类型(NaCl、Na2CO3、Na2SO4、H2SO4)和处理时间(0.5 ~ 2.5 h)等参数对处理效果进行了测试。结果表明,在高电流密度和BDD阳极下,处理效果更好。电解时间越长,处理效率越高。处理2.5 h后,在硫酸作为支撑电解质存在下,苯并三唑的去除率为97.9%。
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