镁改性硅藻土对苦参碱的吸附释放性能研究

doi:10.19964/j.issn.1006-4990.2022-0757

Abstract

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

CLC Number:

X384

DING Ning, ZHANG Jian, PING Qingwei, SHENG Xueru, LI Na. Study on adsorption and release properties of matrine by magnesium-modified diatomite[J]. Inorganic Chemicals Industry, 2023, 55(11): 37-46.

Figures/Tables 14

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温度/℃	∆G/（kJ∙mol^-1）	∆H/（kJ∙mol^-1）	∆S/（kJ∙mol^-1）
30	-40.439	-21.047	0.064
40	-41.039	-21.047	0.064
50	-41.719	-21.047	0.064

温度/℃	Langmuir模型			Freundlich模型
温度/℃	Q_max	K_L	R²	K_F	1/n	R²
30	35.198	0.011	0.627 5	0.937	0.826	0.963
40	25.102	0.030	0.928 3	1.233	0.648	0.991
50	28.826	0.034	0.938 4	0.689	0.661	0.988

温度/℃	准一级动力学模型			准二级动力学模型				Elovich方程模型			颗粒内扩散模型
温度/℃	Q_e	K₁	R²	Q_e	K₂	R²		α	β	R²	K	C	R²
30	0.157	0.440	0.806	0.408	2.508	0.997	0.028		0.304	0.890	0.018	0.307	0.955
40	0.039	0.277	0.871	0.385	7.669	0.999	0.010		0.384	0.864	0.006	0.349	0.940
50	0.044	0.372	0.861	0.388	8.356	0.999	0.010		0.352	0.965	0.006	0.335	0.996

pH	零级动力学模型		一级动力学模型			Ritger-Peppas模型
pH	K₀	R²	K₁	R²		n	log K₂	R²
6	0.065	0.938	-8.805	0.700	0.190		-0.920	0.919
7	0.124	0.911	-0.001	0.934	0.264		-0.964	0.995
8	0.113	0.687	-0.001	0.934	0.251		-0.985	0.973

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

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