Fabrication of Cu2MoS4 decorated WO3 nano heterojunction embedded on chitosan: Robust photocatalytic efficiency, antibacterial performance, and bacteria detection by peroxidase activity

Abstract

In this study, the Cu₂MoS₄/WO₃ supported on chitosan was prepared by precipitation method, and applied to photocatalyst, antibacterial agent and biosensor. The presence of WO₃ and Cu₂MoS₄ crystals were confirmed by XRD analysis. The elemental information was investigated by EDS. FTIR spectra shows the presence of chitosan in nanocomposites. The as-synthesized Cu₂MoS₄/WO₃/Chitosan nanocomposites has a bandgap of 2.18 eV and it is effective for visible light condition. The average particle size of the Cu₂MoS₄/WO₃/Chitosan is 71 nm. The photocatalysis activity Cu₂MoS₄/WO₃/Chitosan was higher than Cu₂MoS₄ or WO₃.The Cu₂MoS₄/WO₃/Chitosan nanocomposites shows the highest efficiency (100%) in photocatalysis degradation of dye under visible light irradiation in 80 min. The •O^2- plays a main role in degradation process. The as-synthesized Cu₂MoS₄/WO₃/Chitosan nanocomposites depicted the antibacterial activity toward G+/- bacteria. Determination of enterococcus faecalis is important for human health. The DNA template was used to the Cu₂MoS₄/WO₃/Chitosan nanocomposites and applied in detection of enterococcus faecalis by H₂O₂ and 3,3',5,5' -tetramethylbenzidine in peroxidase like activity. The detection limit of enterococcus faecalis by DNA-Cu₂MoS₄/WO₃/Chitosan in peroxidase-like catalysis was about 55 CFU/mL. Therefore, the Cu₂MoS₄/WO₃/Chitosan can be applied in the photocatalysis, bactericidal and peroxidase process.

Keywords: Antibacterial; Colorimetric; Cu(2)MoS(4)/WO(3)/Chitosan; Photocatalysis.