γ-氧化铁/山梨酸/银-二氧化钛的制备及抗菌性能

doi:10.19964/j.issn.1006-4990.2021-0115

Abstract

Abstract:

Catalyst of γ-Fe₂O₃/SA/Ag-TiO₂ was synthesized by the sol-gel hydrothermal method.The optimal preparation pa-rameters of γ-Fe₂O₃/SA/Ag-TiO₂ were obtained,in which the log reduction of E.coli under visible light was adopted as the evaluation index.The results,such as n（Ag）/n（Ti）,n（SA）/n（Ti）,hydrothermal temperature,and hydrothermal time were de-termined as 0.03,0.2,160 ℃,and 12 h,respectively.XRD,XPS,BET,FESEM and other characterization methods were used to analyze the structure,surface properties,optical properties and magnetic properties.The catalyst had excellent physical and chemical properties.γ-Fe₂O₃/SA/Ag-TiO₂ consisted of pure anatase,elemental silver,sorbic acid,and paramagnetic γ-Fe₂O₃,among which sorbic acid was combined with TiO₂ in a unidentate manner.The surface structure analysis indicated that the photocatalyst showed regular spherical,and constituted a mesoporous structure with a specific surface area of 125.726 m ²/g.It was proved that the photocatalyst could absorb the full wavelength light of 200~800 nm through optical performance analysis.The saturation magnetization of the material was 10.478 A·m²/kg,which was paramagnetic material.The main ROS,affecting the antibacterial activity of γ-Fe₂O₃/SA/Ag-TiO₂,were determined by the free radical trapping tests.The results were as follow-ing：·OH、O₂ ^·-、h⁺.Free radicals,free Ag⁺ and sorbic acid formed a synergistic antibacterial system,which made the photocata-lyst exhibited strong antibacterial activity under visible light and dark conditions,with the logarithmic removal rates of 5.91 and 2.54,respectively.

Key words: γ-Fe₂O₃, sorbic acid, Ag-TiO₂, E.coil, antibacterial mechanism

CLC Number:

O614
O644

WU Lina,ZHANG Xiangjun,LIN Qingxian. Synthesis and antibacterial performance of γ-Fe₂O₃/sorbic acid/Ag-TiO₂[J]. Inorganic Chemicals Industry, 2021, 53(12): 156-162.

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Synthesis and antibacterial performance of γ-Fe₂O₃/sorbic acid/Ag-TiO₂

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Synthesis and antibacterial performance of γ-Fe2O3/sorbic acid/Ag-TiO2