有机膨润土对印楝素的缓释和稳定作用

采用有机膨润土做载体以延缓印楝素的释放,提高其在水中和光照下的稳定性。印楝素A(Aza-A)的水解和光降解过程可以用一级反应动力学描述,其半衰期分别为67.5、5.35h。有机膨润土能够降低印楝素A在水中的释放速率,且膨润土改性时有机阳离子用量越多,印楝素A释放越慢。有机膨润土做载体可以提高印楝素A在水中的稳定性,并可将其光降解半衰期延长到6.94h。

Slowing the Release and Stabilization of Azadirachtin-A by Organic Bentonites

Organic bentonites were used as carriers so as to slow the release of azadirachtin,and improve its stability in water and under irradiation.The hydrolysis and photo-degradation of azadirachtin-A(Aza-A) could be described with first-order reaction kinetics,and the half-lives were 67.5 h and 5.35 h respectively.Organic bentonites could reduce the release rate of Aza-A in water.The more organic cations used in modification of bentonite,the slower the release of Aza-A.As the carrier,the organic bentonites could improve the stability of Aza-A in water,and prolong the half-life of photo-degradation to 6.94 h.