收稿日期: 2021-03-19
网络出版日期: 2021-12-16
Synthesis and antibacterial performance of γ-Fe2O3/sorbic acid/Ag-TiO2
Received date: 2021-03-19
Online published: 2021-12-16
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。
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 . DOI: 10.19964/j.issn.1006-4990.2021-0115
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
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