Abstract
The Ga0.25Zn4.67S5.08 catalysts were prepared by ultrasonic spray pyrolysis with thiourea as a precursor. The crystal structure, optical properties, specific surface area, chemical composition, surface morphology, and internal structure of the prepared samples were characterized by XRD, UV-Vis DRS, BET, XPS, SEM, and TEM, respectively. The disinfection performance and the main active species of the synthesized catalysts under visible light irradiation were investigated with E. coli K12. The study results indicate that Ga0.25Zn4.67S5.08 prepared at 400°C exhibited the best antibacterial performance with complete kill of E. coli K12 within 4 h. The antibacterial performance of the prepared sample is also higher than that prepared by the hydrothermal method. The result of the radical trapping experiment indicates that the photogenerated holes play a dominant role in the disinfection process.
Highlights
Various pathogenic bacteria living in waters have always been the greatest threat to human health
When the temperature rises to 900°C, there are some possible Ga2O3 and ZnS impurity diffraction peaks in the X-ray diffraction (XRD) pattern, which may be due to the oxidation and decomposition of Ga0.25Zn4.67S5.08 caused by high temperature
2p3/2 and two major peaks at 1021.0 eV and 1044.0 eV ascribed to Zn 2p3/2 and for 2p1/2, respectively (Figure 4(d)), in accordance with Zn2+ in Ga0.25Zn4.67S5.08 [32]. These results further indicate that Ga0.25Zn4.67S5.08 can be successfully synthesized via ultrasonic spray pyrolysis (USP)
Summary
Various pathogenic bacteria living in waters have always been the greatest threat to human health. The UV disinfection method can rapidly achieve the effect of sterilization and disinfection by damaging the molecular structure of microbial DNA or RNA without producing DBPs [6] Some bacteria, such as spores, fungal spores, Mycobacterium tuberculosis, and Bacillus subtilis, are highly resistant to ultraviolet light. It has been reported that the ultrasonic spray pyrolysis (USP), which can be carried out under ambient pressure with no template, serves as a novel preparation method for photocatalyst. It mainly includes atomization of the solution by means of an atomizer and the physicochemical reaction of the droplets under heating conditions [24]. The effect of reaction conditions on the Ga0.25Zn4.67S5.08 was studied, and their photocatalytic activities were evaluated using bacterial disinfection under visible light irradiation
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