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Detection of HO· in electrochemical process and degradation mechanism of pyridine

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Abstract

A HO· detection method based on UV–visible spectrophotometry was established to study the generation and influence mechanism of HO· during electrical advanced oxidation processes (EAOPs), and to analyze the HO· degradation mechanism of pyridine. The ability of HO· capturing agents, salicylic acid (SA) and terephthalic acid (TA) were compared. Compared with SA, TA has a larger cumulative capture of HO· and a higher capture efficiency. The effects of electrochemical conditions were investigated by using TA as a scavenger. The results show that the foam nickel electrode has higher energy efficiency. With the increase of electrolyte concentration, the rate of electron migration in solution is accelerated, which greatly improves the yield of HO·. At the same time, alkaline conditions are more conducive to the formation of HO·. The increase of current density can accelerate the generation of HO·. The degradation mechanism of pyridine in the electrochemical system under different pH conditions was studied. The GC–MS analysis showed that the degradation products of pyridine were different in electrochemical treatment. The main reason was that pH affected the ring opening mode of HO· to pyridine.

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Acknowledgements

The authors greatly acknowledge the funding support of the National Key R&D Program of China (No. 2018YFC1900203).

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  1. Faculty of Environmental Science and Engineering, Kunming University of Science & Technology, Kunming, 650500, Yunnan, China

    Pei Lv, Congqing Yang, Guangfei Qu & Jijia Deng

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  1. Pei Lv
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Correspondence to Guangfei Qu.

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Lv, P., Yang, C., Qu, G. et al. Detection of HO· in electrochemical process and degradation mechanism of pyridine. J Appl Electrochem 50, 1139–1147 (2020). https://doi.org/10.1007/s10800-020-01468-3

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