Pesticide-loading and sustained release performance of functionalization of hexagonal boron nitride nanoplatelets assisted with polysaccharide and protein
Abstract：In order to reduce the pollution of organic solvents to the environment during the use of traditional pesticides and improve the use efficiency of pesticides, the hexagonal boron nitride (h-BN) was modified by ball milling with the aid of Carboxy methyl cellulose (CMC) and Soy protein isolate (SPI). The modified boron nitride carrier was used to adsorb the model drug triadimefon, and different composite systems were prepared by impregnation method. The interaction between pesticide and functionalized nano-carrier was characterized by means of scanning electron microscopy (SEM), transmission electron microscope (TEM), ultraviolet diffuse reflection (UV-DRS), and the slow and controlled release of triadimefon on modified boron nitride carrier was also. the loading amount of triadimefon on the modified boron nitride nanoplates was the highest under acidic conditions, (164.1±2.2) mg·g-1, and the cumulative release rate of triadimefon was only (27.25±0.57)% after 95 h at pH5. The process of pesticide release was in accordance with Korsmeyer Peppas model, the mechanism of diffusion was controlled by physical diffusion, ion exchange and drug dissolution. The contact angle with cucumber leaf surface decreased to (76.75±0.67)°, which indicated that the wettability was improved. The residual amount was still 51.6% after exposing to UV for 460 min. The existence of modified boron nitride composite carrier improved the affinity of triadimefon with cucumber leaf surface, controlled release ability and UV stability which providing a simple way to achieve simultaneous stripping and functionalization of hexagonal boron nitride nanosheets for pesticide loading and transportation.
2021, Vol. 34 
