两种不同形态MnO2降解卡马西平的效果及途径对比

研究了两种不同形态MnO₂（δ-MnO₂和胶体MnO₂）对难降解有机药物卡马西平（carbamazepine，CBZ）的去除效果，并通过液相色谱质谱联用技术（LC/MS）分析了不同pH值条件下δ-MnO₂和胶体MnO₂氧化转化CBZ的产物，探究其氧化转化途径.结果表明，δ-MnO₂和胶体MnO₂能通过化学氧化作用在2h内去除约1mg/L CBZ，相比之下，胶体MnO₂受pH影响较小且单位质量Mn对CBZ具有更好的去除效果.δ-MnO₂和胶体MnO₂与CBZ反应过程中各检出7种和4种产物.胶体MnO₂具有更强的氧化能力，越过了多种中间产物的产生步骤，使CBZ的降解途径更加简明.

Studies on degradation of carbamazepine by two different forms of MnO2

Degradation of carbamazepine (CBZ) by two different forms of MnO₂ (δ-MnO₂ and colloidal MnO₂) was studied and compared. The intermediate products in CBZ oxidation at different pH by δ-MnO₂ or colloidal MnO₂ were analysed via LC/MS. Results demonstrated that 1mg/L of CBZ could be completely removed by both δ-MnO₂ and colloidal MnO₂ within 2 hours. Comparing to δ-MnO₂, colloidal MnO₂ was less affected by pH and had better removal of CBZ per unit mass Mn. In total, 7 and 4 kinds of intermediate products were detected in the process of CBZ oxidation by δ-MnO₂ and colloidal MnO₂, respectively. That was because colloidal MnO₂ had stronger oxidizing power, and could omit several oxidation steps producing various intermediates. As a result, CBZ oxidation by colloidal MnO₂ was via a more concise pathway.