Khan Atif, Yasin Saima, Mahmood Hamayoun, Afzal Shabana, Iqbal Tanveer
Department of Chemical Engineering, University of Engineering and Technology Lahore 54890 Pakistan
Department of Basic Sciences and Humanities, Muhammad Nawaz Sharif University of Engineering and Technology Multan 60000 Pakistan.
RSC Adv. 2024 Nov 6;14(45):33223-33232. doi: 10.1039/d4ra05590j. eCollection 2024 Oct 17.
This study aims to develop a benign and commercially viable method for the degradation of monoethanolamine (MEA) in the aqueous phase an ultraviolet/hydrogen peroxide (UV/HO) advanced oxidation process (AOP). The current investigation is novel in terms of detailed kinetic analysis and degradation mechanisms; the impact of pH and UV light intensity on MEA degradation was thoroughly examined. pH 9 was identified as the optimal condition, achieving a degradation efficiency of 76.28%, while the highest UV light intensity of 59.055 mJ cm resulted in an 85.13% degradation efficiency. A comprehensive kinetic study highlighted the reaction rates under varying conditions, providing valuable insights and dynamics of the degradation. The mechanistic pathway of MEA breakdown, identified using Liquid Chromatography Mass Spectrometry (LCMS) analysis revealed ethylene glycol, glycolaldehyde, glycine aldehyde, glycine, carbon dioxide, and ammonium ions as the primary degradation products. These results provide both operational insights and a greater understanding of the degradation mechanism, demonstrating that UV/HO AOP offers an effective and environmentally benign solution for MEA degradation. The findings make a substantial contribution to the development of MEA treatment methods that are both economically viable and sustainable.
本研究旨在开发一种在水相中降解单乙醇胺（MEA）的良性且具有商业可行性的方法——紫外/过氧化氢（UV/H₂O₂）高级氧化工艺（AOP）。当前的研究在详细的动力学分析和降解机制方面具有新颖性；全面考察了pH值和紫外光强度对MEA降解的影响。确定pH值为9是最佳条件，降解效率达到76.28%，而最高紫外光强度59.055 mJ/cm²时降解效率为85.13%。一项全面的动力学研究突出了不同条件下的反应速率，为降解提供了有价值的见解和动力学信息。使用液相色谱-质谱联用（LCMS）分析确定的MEA分解的机理途径显示，乙二醇、乙醇醛、甘氨酸醛、甘氨酸、二氧化碳和铵离子是主要降解产物。这些结果既提供了操作方面的见解，也让人对降解机制有了更深入的理解，表明UV/H₂O₂ AOP为MEA降解提供了一种有效且环境友好的解决方案。这些发现为开发经济可行且可持续的MEA处理方法做出了重大贡献。
