Inorganic Chemicals Industry >
Synthesis and antibacterial performance of γ-Fe2O3/sorbic acid/Ag-TiO2
Received date: 2021-03-19
Online published: 2021-12-16
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
Lina WU , Xiangjun ZHANG , Qingxian LIN . Synthesis and antibacterial performance of γ-Fe2O3/sorbic acid/Ag-TiO2[J]. Inorganic Chemicals Industry, 2021 , 53(12) : 156 -162 . DOI: 10.19964/j.issn.1006-4990.2021-0115
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