Dip coated rapeseed meal composite as a green carrier for light induced controlled release of pesticide

In this work, we report the novel fabrication of a polymerized octadecylsiloxane (PODS)/ 4–aminoazobenzene (AAB) coated rapeseed meal (RSM) using facile one–pot dip–coating method. The as–prepared RSM–PODS/AAB employs the RSM as a carrier, PODS coating endows the material with hydrophobicity, thus improving the loading rate of pinoxaden (Pxd) of the RSM–PODS/AAB and the AAB moieties act as light–driven “stirrers” to stir the release of Pxd. The structure and composition was characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), X–ray Photoelectron Spectroscopy (XPS), X–ray diffraction (XRD), ultraviolet–visible spectroscopy and the contact angle measuring device. The experiment results indicate that the loading rate of Pxd was increased by 21.38% compared with pristine RSM. More importantly, the Pxd-loaded RSM–PODS/AAB showed perfect UV–vis and sunlight controlled release performance, and the excellent biodegradability of RSM effectively supplying the nutrient elements of plant growth in the soil. Overall, this system provides a promising way to improve the control drug release with UV–vis and sunlight responsive behavior.