ODA及PEGDGE同步官能化BNNS负载阿维菌素及其性能研究

Study on avermectins supported by ODA and PEGDGE functionalized hexagonal boron nitride and its performance

为提高阿维菌素(Avermectins,AVM)的使用效率、减少阿维菌素的光降解率,用十八胺(Octadecane,ODA)及聚乙二醇二缩水甘油醚(Poly(ethylene glycol)diglycidyl ether,PEGDGE)通过水热法与超声剥离的六方氮化硼纳米片(Hexogonal boron nitride nanosheets,BNNS)作用得到氮化硼基农药载体分散剂.分别考察了pH值、投料比与水热反应温度对BNNS-PEGDGE-ODA载体水分散性的影响.结果表明:在pH 1,进料比1∶2∶8∶24,反应温度60℃时得到水分散稳定性最佳的BNNS-PEGDGE-ODA载体.载体通过浸渍吸附法吸附阿维菌素,吸附量达158.65 mg·g^(-1).在pH 9条件下阿维菌素480 h的累积释放率仅为22.34%,持续暴露在紫外光照射190 min后残留量仍为47.62%.BNNS-PEGDGE-ODA载体是一种具有控制释放能力及紫外光稳定性能,并且环境友好的农药载体.

In order to improve the use efficiency of Avermectins and avoid the photodegradation of AVM,the hexagonal boron nitride exfoliated by ultrasonication was modified via hydrothermal method with octadecylamine(ODA)and polyethylene glycol diglycidyl ether(PEGDGE).The effects of pH value,feed ratio and hydrothermal reaction temperature on the aqueous dispersion stability of functionalized h-BN were investigated.The results showed that:when the pH value was 1,the feed ratio was 1∶2∶8∶24,and the reaction temperature was 60℃,the BNNS-PEGDGE-ODA carrier with the best aqueous dispersion stability was achieved.The functionalized boron nitride carrier was applied to load the pesticide(i.e.avermectin),and the loading capacity reached 158.65 mg·g^(-1).The cumulative release rate of avermectin was only 22.34%at pH 9 after 480 h and the residual amount was still 47.62%after exposing to UV irradiation for 190 min.The existence of BNNS-PEGDGE-ODA carrier is a potential candidate for environmentally friendly pesticide carriers with controlled release ability and UV stability.