三乙醇胺的电化学降解研究

Study on Electrochemical Degradation of Triethanolamine

采用电化学的方法对三乙醇胺进行降解,并研究了三乙醇胺的降解产物以及可能的降解过程。利用电化学工作站获得三乙醇胺的电化学窗口信息,电解降解后再利用气相色谱-质谱法(GC-MS)对三乙醇胺的降解产物进行分离分析。结果表明,降解三乙醇胺的最佳支持电解质为Na_(2)SO_(4)溶液,且三乙醇胺主要在阳极上发生氧化反应。在反应时间为150 min,初始pH为3~4,极板间距为2 cm的降解条件下,对浓度为0.04 mol·L^(-1)的三乙醇胺进行降解。通过与标准图谱对照分析,推断出三乙醇胺降解过程中生成的新物质为N,N-二(2-羟基乙基)甲酰胺,最终得出三乙醇胺的可能降解途径。

The degradation product of triethanolamine and the possible degradation process were studied by electrochemical method.The electrochemical window information of triethanolamine was obtained by electrochemical workstation.After electrolytic degradation,the degradation product was analyzed by gas chromatography-mass spectrometry(GC-MS).The results showed that the best supporting electrolyte for the degradation of triethanolamine was sodium sulfate,and the main reaction was oxidation.Under the conditions of a reaction time of 150 min,an initial pH of 3-4,and a plate spacing of 2 cm,triethanolamine with a concentration of 0.04 mol·L^(-1) was degraded.Compared with the standard mass spectral data,N,N-bis(2-hydroxyethyl) formamide was supposed to be the new substance formed during the degradation of triethanolamine.Finally,the possible degradation path of triethanolamine was obtained.