Study of a new 3D MOF and its adsorption, slow release and biological activity in water-soluble and oil-soluble pesticides

In order to solve the problems of pesticide degradation, short duration, low utilization rate and environmental pollution, etc. We used a three steps synthesized ligands of (E)-bis(p-3-nitrobenzoic acid) vinyl (C16H10N2O8) to construct a 3D porous MOF-Zn2(EBNB)2(BPY)2·2H2O and use it in as the matrix to construct the pesticide adsorption sustained-release system. Water-soluble and oil-soluble model pesticides were selected to study the pesticide loading, releasing performance and biological activity of Zn2(EBNB)2(BPY)2·2H2O to these pesticides. The results showed that the sustained-release system had the characteristics of long duration, so it could reduce the times of pesticide use. According to the annual control plan and dosage of the crop, the reasonable use of slow-release preparation can effectively prolong the control cycle of the crop. [Display omitted] •A new 3D MOF has been synthesized through a three steps synthesized ligand.•The pesticide releasing performance of it to selected pesticides were characterized.•It can reduce the times of pesticide use and prolong the control cycle of the crop. The ligands of (E)-bis(p-3-nitrobenzoic acid) vinyl (C16H10N2O8) were synthesized in three steps, and then the MOF-Zn2(EBNB)2(BPY)2·2H2O was synthesized by solvothermal method. This structure was characterized by X-ray single crystal diffraction, SEM and TG. The pesticide loading and release of Zn2(EBNB)2(BPY)2·2H2O were also studied with jinggangmycin and avermectin as model pesticides, representing water-soluble and oil-soluble pesticides respectively. The results show that the highest loading amount of Zn2(EBNB)2(BPY)2·2H2O to jinggangmycin and avermectin was 0.346 g/g and 0.304 g/g. The pesticide delivery system was a two-phase mode and the cumulative release of jinggangmycin was 76.8%, of avermectin was 73.8% in 84 h, which show obvious slow release effect. Meanwhile, compared with the control group of jinggangmycin·avermectin wettable powder, the sustained-release system has better effect on the inhibition of rhizoctonia graminearum.