Facile synthesis of Rh/Ti3+-TiO2 nanocomposites and its photodisinfection properties on Staphylococcus aureus under visible-NIR excitation

Jingtao Zhang,Shurui Liu,Qinwen Wang,Jing Yao,Yin Liu,Bingkun Liu,Jun Xiao,Hengzhen Shi

doi:10.1016/j.matlet.2020.128257

Jingtao Zhang, Shurui Liu + Show 6 more

Open Access

https://doi.org/10.1016/j.matlet.2020.128257

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Abstract

In this study, we synthesized a series of rhodium-modified and Ti3+ self-doped TiO2 (Rh/Ti3+-TiO2) nanocomposites via the one-pot method. The result products were analyzed using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Electron Spin Resonance (ESR), and Uv–vis–NIR analysis. We found that the ability of TiO2 to absorb near-infrared and visible light was significantly improved by the Rh/Ti3+-TiO2 nanocomposites, due to Ti3+ doping as well as modification of Rh. The disinfection properties of these materials were tested using Staphylococcus aureus under visible light and NIR light excitations. The synthesized photocatalyst was found to exhibit significantly enhanced photocatalytic inactivation of S. aureus under both visible and NIR light irradiation, as compared to pure TiO2.

Highlights

Photodisinfection technology based semiconductors has attracted attention of many researchers as a novel potential bacterial inaction technology in food safety area [1]
The photocatalytic antimicrobial performance of a TiO2 nanocomposite with low-density polyethylene (LDPE) film and its fresh-keeping test for fresh pear were studied by Li et al [10]
In the Vis-NIR area, we found a significantly rate of absorption in the synthesized Rh/Ti3+-TiO2 nanocomposite samples after analyzing the structure of their crystals using transmission electron microscopy (TEM), X-ray diffraction (XRD), and Electron Spin Resonance (ESR) methods

Summary

Introduction

Photodisinfection technology based semiconductors has attracted attention of many researchers as a novel potential bacterial inaction technology in food safety area [1]. TiO2 was one of the most attractive photocatalyst owing to its properties of high photocatalytic efficiency, high chemical and physical stability, and low cost [2,3,4,5]. Previous reports have demonstrated that the TiO2 photocatalyst can be used for food microorganism disinfection under UV or visible light irradiation [6,7,8,9]. We synthesized rhodium-modified and Ti3+ self-doped TiO2 (Rh/Ti3+-TiO2) nanocomposites using a facile, solvothermal method. In the Vis-NIR area, we found a significantly rate of absorption in the synthesized Rh/Ti3+-TiO2 nanocomposite samples after analyzing the structure of their crystals using TEM, XRD, and ESR methods. Our disinfection results demonstrated that S. aureus could be disinfected via illumination with Vis-NIR light in the Rh/Ti3+-TiO2 nanocomposite

Methods

Results And Discussion

Conclusions