Abstract:

The degradation process of heteroatom organics by high active hydroxyl radicals generated from DC corona discharge plasma was investigated using pyridine as a model pollutant.The electrochemical process could be fully elucidated from the point of view of water droplets，water droplet or cloudy droplet formed the small electrolytic cell.90.4% of pyridine could be removed at 20.75 kV and the initial concentration of pyridine was 8287 mg·m^-3.Intermediates in droplet were detected by HPLC，indicating that fumaric acid and oxalic acid were the main intermediates，and nitrate was detected by ion chromatographic.Based on the above results，the possible degradation pathway of pyridine was proposed.

Key words: FONT-FAMILY: 宋体, mso-bidi-font-size: 12.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Times New Roman">直流电晕放电；羟基自由基；降解；吡啶；电化学过程

摘要：

以吡啶为模型污染物，研究了电晕放电等离子体过程中产生的高活性羟基自由基降解含氮杂原子有机物的过程，从微液滴角度理解在有水存在下电晕放电的电化学过程。高压电场下，微液滴水汽形成微电解池，电化学反应在这一微电解池中进行。结果表明：电压为20.75 kV时，平均初始浓度为8287 mg·m^-3吡啶的去除率达到90.4%。液相色谱分析结果表明,液滴中的中间产物有反丁烯二酸、草酸等小分子酸，离子色谱检测到了硝酸根离子的存在，由此推导了有机物的降解路径。

关键词: FONT-FAMILY: 宋体, mso-bidi-font-size: 12.0pt, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, mso-ascii-font-family: Times New Roman">直流电晕放电；羟基自由基；降解；吡啶；电化学过程