Cu2MoS4-based magnetic composites as effective adsorbent and photocatalyst for removal of organic contaminants in water

Comprehensive Insights into the Family of Atomically Thin 2D-Materials for Diverse Photocatalytic Applications

2D materials with their fascinating physiochemical, structural, and electronic properties have attracted researchers and have been used for a variety of applications such as electrocatalysis, photocatalysis, energy storage, magnetoresistance, and sensing. In recent times, 2D materials have gained great momentum in the spectrum of photocatalytic applications such as pollutant degradation, water splitting, CO2 reduction, NH3 production, microbial disinfection, and heavy metal reduction, thanks to their superior properties including visible light responsive band gap, improved charge separation and electron mobility, suppressed charge recombination and high surface reactive sites, and thus enhance the photocatalytic properties rationally as compared to 3D and other low-dimensional materials. In this context, this review spot-lights the family of various 2D materials, their properties and their 2D structure-induced photocatalytic mechanisms while giving an overview on their synthesis methods along with a detailed discussion on their diverse photocatalytic applications. Furthermore, the challenges and the future opportunities are also presented related to the future developments and advancements of 2D materials for the large-scale real-time photocatalytic applications.

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

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.