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以化学合成δ-MnO2为氧化剂,研究其对土霉素(OTC)氧化降解反应动力学,并探讨初始δ-MnO2含量、pH及共存物(无机阳离子和有机酸)对氧化降解动力学的影响。结果表明,δ-MnO2对OTC有较强降解效果,且随初始δ-MnO2含量升高而增强;OTC氧化降解不是简单的准1级反应动力学,而遵循复合的反应动力学;pH对OTC氧化降解影响显著,降解速率随pH降低而明显升高;共存无机阳离子和有机酸对OTC的降解均有一定抑制作用,阳离子抑制作用表现为Mn2+>Fe3+>Ca2+>Mg2+,有机酸抑制作用表现为单宁酸>腐植酸,且阳离子和有机酸的含量,越高抑制作用越强。
The oxidative degradation kinetics of oxytetracycline (OTC) was studied by chemical synthesis of δ-MnO2 as oxidant, and the effects of initial δ-MnO2 content, pH and coexisting materials (inorganic cations and organic acids) on the oxidative degradation kinetics . The results show that δ-MnO2 has a strong degradation effect on OTC and increases with the initial δ-MnO2 content. Oxygen degradation is not a simple quasi-first-order reaction kinetics but follows the complex reaction kinetics. Oxidative degradation was significantly affected, and the degradation rate was significantly increased with the decrease of pH. The coexistence of inorganic cation and organic acid inhibited the degradation of OTC, while the inhibition of cation showed Mn2 +> Fe3 +> Ca2 +> Mg2 + Tannic acid> humic acid, and the content of cation and organic acid, the higher the inhibitory effect.