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

摘要/Abstract

摘要：

采用溶胶凝胶-水热法制备了γ-氧化铁/山梨酸/银-二氧化钛催化剂。以可见光驱动下对大肠埃希氏菌的对数去除率为评价指标,获得了催化剂的最佳制备参数：n（银）/n（钛）=0.03、n（山梨酸）/n（钛）=0.2、水热温度为160 ℃、水热时间为12 h。利用X射线衍射（XRD）、X射线光电子能谱（XPS）、BET法比表面积（BET）、高倍扫描电镜（FESEM）等表征方法对其结构、表面特性、光学性能和磁性性能进行分析。催化剂的物化性能优异：构成为纯锐钛矿二氧化钛、顺磁性γ-氧化铁和单质银,山梨酸以单齿方式与二氧化钛结合;外观为类球形构成的比表面积为125.726 m²/g的介孔结构;可响应200~800 nm全波段光;是饱和磁化强度为10.478 A·m²/kg的超顺磁材料。自由基淬灭试验确定活性氧（ROS）影响抗菌活性的顺序从大到小依次为·OH、O₂^·-、h⁺。自由基、游离银离子和山梨酸构成协同抗菌体系,使催化剂在可见光和黑暗条件下均具有良好的抗菌活性,对数去除率分别为5.91和2.54。

关键词: γ-氧化铁, 山梨酸, 银-二氧化钛, 大肠埃希氏菌, 抗菌机理

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

中图分类号:

O614
O644

吴丽娜,张向军,林清娴. γ-氧化铁/山梨酸/银-二氧化钛的制备及抗菌性能[J]. 无机盐工业, 2021, 53(12): 156-162.

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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