Preparation of montmorillonite-based pH-responsive nanopesticide carrier modified by metal polyphenol complex and drug sustained release mechanism
In order to increase the utilization of pesticides,reduce losses and enable its slowly release in a specific environment.In this study,Tetrabutyltitanate(Ti)and Tannin(Ta)were used to modify Mont-morillonite(Mt)to load Avermectin(AVM).The obtained pH responsive drug sustained release system was named AVM@Fe-Ta-TiPMt and AVM@Cu-Ta-TiPMt.The structure of the clay samples were char-acterized by Thermogravimetric analyzer(TGA),Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),etc.Thenanopartcials with an average of 345.72 nm of AVM@Fe-Ta-TiPMt and 570.88 nm of AVM@Cu-Ta-TiPMt and the Zate potential was-38.09 mV and-32.88 mV.The effect of different metal ion-chelated tannic acid-modified samples on the slow-release performance of AVM at different pH conditions was investigated.The results showed that the cumulative release rate of AVM in AVM@Fe-Ta-TiPMt(85％)under neutral conditions was higher than that in AVM@TiPMt(77％),and the cumulative release rate of AVM in AVM@Cu-Ta-TiPMt(51.4％)under neutral condi-tions was lower than that of its cumulative release rate at both pH 4 and 9.Indicating that this pH-respon-sive nano sustained release system enables the release of pesticide in specific environments.
万方数据
维普
