臭氧氧化多菌灵表观速率常数影响因素的研究

Research the Factor Affecting the Apparent Rate Constant in the Decomposition of Carbendazim by Oozone Oxidation

[目的]考察多菌灵初始浓度、臭氧投加量和温度对臭氧氧化降解多菌灵反应表观速率常数的影响。[方法]采用臭氧氧化降解水体中的多菌灵,考察多菌灵降解过程中表观反应速率常数与反应剂量因素的关系。[结果]在不同臭氧投加量和不同初始浓度条件下,多菌灵降解均符合假一级反应动力学。表观速率常数与臭氧投加量呈正相关性,与多菌灵初始浓度呈负相关性。表观速率常数随多菌灵初始浓度的增加而减小,但是反应物的绝对去除量增加,表明增加多菌灵初始浓度有利于提高臭氧的利用效率。表观速率常数随温度的升高而增加,与一般化学反应规律相符合。[结论]为安全有效地降解多菌灵提供了参考。

[Objective] The effect of the initial concentration of carbendazim,the adding amount of ozone and temperature on the apparent rate constant in the degradation of carbendazim was researched.[Method] The relationship between the apparent rate constant and reaction dose in the process of the carbendazim degradation in water was experimented.[Results] The results indicated that under the condition of different doses of ozone-adding and initial concentrations the process of carbendazim degradation was matched with the pseudo-first-order kinetic model.The apparent rate constants had the positive relativity with applied ozone dose and negative correlation with initial concentration.The apparent rate constant was decreased with increment of initial concentration.However,the absolute removal rate of the reactants was increased,which indicated that the increment of initial concentration would be beneficial to the improvement of the utilization rate of ozone.The apparent rate constant was increased with the increment of temperature,which was consistent with the general law of chemical reaction.[Conclusion] The reference for the safety and efficiency degradation of carbendazim was provided through the experiment.