Collaborative Innovation Center for Advanced Nuclear Energy Science Building, INEB, Tsinghua University, Beijing, 100084, People's Republic of China.
Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, People's Republic of China.
Environ Sci Pollut Res Int. 2017 Jan;24(1):568-577. doi: 10.1007/s11356-016-7768-9. Epub 2016 Oct 13.
The kinetics and catalytic mechanism of sulfamethazine (SMT) degradation using FeO/MnO nanocomposite as catalysts in heterogeneous Fenton-like process were investigated. The degradation process of SMT conformed to first-order kinetic model. The apparent activation energy (E ) of the process was calculated to be 40.5 kJ/mol. The reusability and stability of the catalysts were evaluated based on the results of the successive batch experiments. The intermediates were identified and quantified by ion chromatography (IC), high-performance liquid chromatography (HPLC), and gas chromatography-mass spectrometry (GC-MS). The results suggested that the bonds of S-C, N-C, and S-N were broken mainly by ·OH attack to form the organic compounds, which were gradually decomposed into small-molecule organic acids, such as oxalic acid, propionic acid, and formic acid. The possible catalytic mechanism for SMT degradation was tentatively proposed.
采用 FeO/MnO 纳米复合材料作为非均相类 Fenton 催化剂，研究了磺胺甲噁唑（SMT）降解的动力学和催化机制。SMT 的降解过程符合一级动力学模型。该过程的表观活化能（Ea）计算为 40.5kJ/mol。根据连续批实验的结果评估了催化剂的可重复使用性和稳定性。通过离子色谱（IC）、高效液相色谱（HPLC）和气相色谱-质谱联用（GC-MS）鉴定和定量了中间产物。结果表明，S-C、N-C 和 S-N 键主要通过·OH 攻击断裂，形成有机化合物，这些化合物逐渐分解为小分子有机酸，如草酸、丙酸和甲酸。初步提出了 SMT 降解的可能催化机制。
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