印楝素A降解动力学研究

Degradation Kinetics of Azadirachtin A with the Influence of Temperature

研究pH、水分、紫外光、温度对印楝素A稳定性的影响,建立在不同条件下印楝素A的一级降解动力学模型。计算印楝素A降解反应的反应速率常数、温度效应系数(Q)、活化能(Ea)、活化焓(ΔH)和活化熵(ΔS)。结果表明,印楝素A的活化能为98.49kJ/mol,活化焓为95.84kJ/mol,活化熵为10.68kJ/mol·K。印楝素A在环境中的降解反应是自发反应,在环境中易自然降解。

The pH value, temperature, water and UV light were systematically investigated to explain their influence on chemical reaction grade, reaction rate coefficient, Arrhenius coefficient, temperature effect quotient （Q）, activation energy（Ea）, activation enthalpy（△H） and activation entropy（△S） of azadirachtin A. Degradation of azadirachtin A was observed to follow the first-order kinetic equation. The Ea of azadirachtin A was 98.49 k J/mol, the AH of azadirachtin A 95.84 kJ/mol, and the △S of azadirachtin A 10.68 kJ/mol· K. Azadirachtin A belonged to a group of easily degraded insecticide, and its degradation reaction was spontaneous.