Synthesis and application of g-C3N4/Fe3O4/Ag nanocomposite for the efficient photocatalytic inactivation of Escherichia coli and Bacillus subtilis bacteria in aqueous solutions

AMB Express

Hamid Reza Sobhi¹  Ramin maleki²  Mitra Gholami³  Roshanak Rezaei Kalantary³  Ali Esrafili³  Soudabeh Ghodsi⁴ 

[1] Department of Chemistry, Payame Noor University, Tehran, Iran;Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran;Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran;Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran;Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran;

关键词: Photocatalysis;    E. coli;    B. subtilis;    g-CN/FeO/Ag;    Inactivation;   

DOI  :  10.1186/s13568-021-01324-3

来源: Springer

【 摘 要 】

Contamination of water with bacteria is one of the main causes of waterborne diseases. The photocatalytic method on the basis of bacterial inactivation seems to be a suitable disinfectant due to the lack of by-products formation. Herein, g-C3N4/Fe3O4/Ag nanocomposite combined with UV-light irradiation was applied for the inactivation two well-known bacteria namely, E. coli and B. subtilis. The nanocomposite was prepared by a hydrothermal method, and subsequently it was characterized by XRD, FT-IR, SEM, EDX and PL analyses. The optimum conditions established for the inactivation of both bacteria were as follows: nanocomposite dosage 3 g/L and bacterial density of 103 CFU/mL. In the meantime, the efficient inactivation of E. coli and B. subtilis took 30 and 150 min, respectively. The results also revealed that inactivation rate dropped with an increase in the bacterial density. It is also pointed out that OH˚ was found out to be the main radical species involved in the inactivation process. Finally, the kinetic results indicated that the inactivation of E. coli and B. subtilis followed the Weibull model. It is concluded that C3N4/Fe3O4/Ag nanocomposite along with UV-light irradiation is highly effective in inactivating E. coli and B. subtilis bacteria in the aqueous solutions.

【 授权许可】

CC BY