Synthesis and Antibacterial Performance of γ-Fe2O3/Ag/TiO2†

doi:10.7503/cjcu20180643

Abstract

Abstract:

The photocatalyst γ-Fe₂O₃/Ag/TiO₂with highly visible-light response was synthesized by two-step process. The photocatalytic antibacterial performance under visible light was evaluated by the lgReduction on the E. coli. The physical and chemical properties of γ-Fe₂O₃/Ag/TiO₂ were analyzed by means of X-ray powder diffraction(XRD), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), magnetic property measurement system(MPMS) and other characterization methods. The results indicate that the catalyst has mesoporous structure with a specific surface area of 89.1 m²/g and its absorption boundary reaches 690 nm. The catalyst exhibited excellent visible light response, remarkable antibacterial properties and strong magnetic properties, which can be effectively separated and reused in the water treatment. The optimal preparation parameters, such as the calcination temperature, the calcination time and n(Ti)/n(Ag) were determined as 350 ℃, 3 h and 1:0.05, respectively.

Key words: γ-Fe₂O₃, Ag/TiO₂, E. coli, Antibacterial performance

CLC Number:

O614
O644

TrendMD:

AI Cuiling,WU Lina,ZHANG Rongrong,SHAO Xiangwen,XU Junge. Synthesis and Antibacterial Performance of γ-Fe₂O₃/Ag/Ti $O 2 †$ [J]. Chem. J. Chinese Universities, 2019, 40(4): 645.

Figures/Tables 11

Fig.1 XRD patterns of γ-Fe2O3(a), γ-Fe2O3/TiO2(b) and γ-Fe2O3/Ag/TiO2(c)

Fig.3 HRTEM image of γ-Fe2O3/Ag/TiO2

Fig.2 Wide-scan(A), Ag3d(B) and Fe2p(C) XPS spectra of γ-Fe2O3/Ag/TiO2

Fig.4 SEM images of TiO2(A), γ-Fe2O3(B), Ag/TiO2(C) and γ-Fe2O3/Ag/TiO2(D)

Fig.5 N2 adsorption-desorption isotherms of γ-Fe2O(A), γ-Fe2O3/TiO2(B) and γ-Fe2O3/Ag/TiO2(C)

Fig.6 UV-Vis DRS of TiO2(a), Ag/TiO2(b) and γ-Fe2O3/Ag/TiO2(c)

Fig.7 Saturated magnetic intensity curves and magneticproperties(inset) of γ-Fe2O3/Ag/TiO2a, b. Before antibacterial test; c. after antibacterial test. a. γ-Fe2O3; b. γ-Fe2O3/Ag/TiO2.

Fig.8 XRD patterns of γ-Fe2O3/Ag/TiO2 a. Without antibacterial test; b. calcined after recovered; c. not calcined after recovered.

Fig.9 Antibacterial performance of γ-Fe2O3/Ag/TiO2 with different Ti/Ag molar ratio(A), calcination temperatures(B) and calcination time(C)

Fig.10 Antibacterial performance of γ-Fe2O3/Ag/TiO2 with different trapping agents (A) 2 mmol/L BZQ; (B) 25 mmol/L EDTA-2Na; (C) 50 mmol/L IPA.

Fig.11 Effect of different light sources on antibacteria properties of γ-Fe2O3/Ag/TiO2 a. Darkness; b. visible light; c. sunlight.

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Synthesis and Antibacterial Performance of γ-Fe₂O₃/Ag/Ti $O 2 †$

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