MnO₂ polymorphs direct the selective degradation of fluoroquinolone antibiotics: Insights from adsorption, oxidation, and O₂ activation mechanisms
MnO₂ polymorphs direct the selective degradation of fluoroquinolone antibiotics: Insights from adsorption, oxidation, and O₂ activation mechanisms
研究概述
比较六种MnO2晶型对氟喹诺酮抗生素的吸附和降解，发现ε相去除效率最高、δ相最低，且晶型改变选择性断键路径。ε-MnO2促进环丙沙星C—F断裂，将计算能垒由253降至114 kJ/mol；EXAFS支持Mn(IV)还原后Mn(III)活化O2的氧化–催化耦合机制。
谱图与表征信息
Fig. 6. XAFS analysis of α-, β-, γ-, δ-, ε-, and λ-MnO2. Schematic diagram of in-situ XAFS instrument device(a), XANES analysis (b), k and R space EXAFS spectra (c-d) of α-, β-, γ-, δ-, ε-, and λ-MnO2, wavelet transform of ε- and γ-MnO2 (e).