中文摘要：

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。

英文摘要：

The oxidative degradation of oxytetracycline（OTC） by the δ-MnO2was investigated in batch experiments,and the influence of pH,MnO2dosage and co-solutes（e.g.inorganic ions and organic acid） on the reaction kinetics was discussed.Results showed that OTC was rapidly degraded in the presence of δ-MnO2,and the reaction rate of OTC increased with the increasing of δ-MnO2initial concentration.The oxidative degradation did not follow the pseudofirst-order kinetics,but followed complex reaction kinetics.The reaction rate of OTC also decreased significantly as the pH of reaction mixture increased from 5.0 to 8.0.And the presence of co-solutes reduced the reaction rate of OTC.The inhibitive capacity of coexisting metal ions followed the order Mn2＋ Fe3＋Ca2＋Mg2＋,and the organic acids followed tannic acid（TA） humic acid（HA）.