微纳米气泡耦合尿素同时脱除NO和SO_(2)及其机理的研究

Study on simultaneous removal of NO and SO_(2) by micro-nano bubbles coupled with urea and its mechanism

利用基于尿素溶液的微纳米气泡气液分散体系实施同时脱除NO和SO_(2),并考察了不同参数对脱除的影响。结果表明,各种所考察的参数对SO_(2)脱除效率均无显著影响,但均影响了NO的脱除效率。随着尿素溶液初始pH、尿素浓度以及SO_(2)浓度的提高,NO的脱除效率均先升高后降低;提高尿素溶液初始温度或NO浓度会降低NO的脱除效率。此外,通过机理分析发现,微纳米气泡释放的羟基自由基对NO和SO_(2)的脱除起了主导作用,尿素能进一步促进NO的脱除。

The simultaneous removal of NO and SO_(2)by micro-nano bubble gas-liquid dispersion system based on urea solution was carried out and the effects of different parameters on the removal were investigated.The results showed that all the parameters had no significant effect on the removal efficiencies of SO_(2),but they all affected the removal efficiencies of NO.With the increase of initial pH of urea solution,urea concentration and SO_(2)concentration,the removal efficiencies of NO increased first and then decreased.Increasing the initial temperature of urea solution or NO concentration could reduce the removal efficiencies of NO.In addition,through mechanism analysis,it was found that the hydroxyl radical released by micro-nano bubbles played a leading role in the removal of NO and SO_(2),and urea could further promote the removal of NO.