Inorganic Chemicals Industry ›› 2023, Vol. 55 ›› Issue (11): 37-46.doi: 10.19964/j.issn.1006-4990.2022-0757

• Research & Development • Previous Articles     Next Articles

Study on adsorption and release properties of matrine by magnesium-modified diatomite

DING Ning(), ZHANG Jian, PING Qingwei, SHENG Xueru, LI Na   

  1. Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials,Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery,College of Light Industry and Chemical Engineering,Dalian Polytechnic University,Dalian 116034,China
  • Received:2022-12-29 Online:2023-11-10 Published:2023-11-16

Abstract:

The overuse of chemical pesticides has caused serious environmental problems. Using plant source pesticides is a new way to control pests and reduce agricultural residues.However,the short effect and easy degradation limit its wide application.The magnesium oxide modified diatomite(MD) was used as a drug carrier,which could form a complex with the plant derived pesticide matrine and make it adhere to the surface of MD.Magnesium oxide modified diatomite was characterized by specific surface area analyzer,scanning electron microscope and energy spectrum,and the preparation process,adsorption mechanism and slow release properties were discussed.The study showed that the magnesium oxide modified diatomite had more adsorption sites.Compared with the original diatomite,the adsorption capacity of the magnesium oxide modified diatcomite for matrine was increased by 130%.The adsorption kinetics and thermodynamics showed that the adsorption of matrine on magnesium oxide modified diatomite was more consistent with the Freundlich adsorption model and the quasi-second-order kinetic model.It was revealed that the adsorption was a chemical endothermic process of polymolecular adsorption.The release kinetics study indicated that the release process was mainly controlled by Fick diffusion.The release time was prolonged from 4 h to 180 h compared with that of commercially available liposomes and protein microcapsules.This study explored the preparation process and sustained-release performance of diatomite based plant-derived sustained-release pesticides,which could provide theoretical reference for actual drug use in the field.

Key words: matrine, diatomite, adsorption, sustained release performance, kinetics

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