Search

This study explored Ag-guided strain formation in ZnO that can manipulate defects in related properties, which are helpful in enhancing the photocatalytic performance of ZnO. Ag@ZnO nanosheets were synthesized with varying Ag concentrations (0–5 at%) through a cost-effective hydrothermal method and employed for the efficient removal of environmentally concerning dyes, namely methylene blue (MB), methyl orange (MO), and rhodamine B (RhB), under natural sunlight radiation. Microscopic images (SEM and TEM) revealed the nanoplates regardless of the Ag concentrations. The XRD pattern confirmed the pure phase of the hexagonal wurtzite structure of ZnO, while the crystallite size decreased from 25 to 20 nm, augmented with the bright field-TEM images. The energy bandgap, E g , decreased from 3.24 to 3.18 eV, as Ag concentration increased from 0 to 5 at%. The highest photocatalytic efficiency of Ag@ZnO:5 at% was achieved to be ∼93 %, ∼97.5 %, and ∼98 % for MO, MB, and RhB, respectively. The enhanced photocatalytic activity of Ag@ZnO:5 at% was attributed to the high charge separation efficiency and many active sites due to the surface integration of Ag atoms and defects states. Ag@ZnO:5 at% nanoplates showed significant inactivation against environmentally transmitted pathogenic bacteria within 30 min. These findings underscore the significant potential of Ag@ZnO photocatalysts for sunlight-driven removal of organic pollutants, aligning with the sustainability goals advocated by the United Nations. The outcomes of this research contribute valuable insights into the development of efficient photocatalytic materials for environmental pollution remediation. [Display omitted] • Synthesis of ZnO@Ag (0–5 at%) nanoplates by cost-effective hydrothermal method. • Lattice distortion increases with Ag concentration, causing reduced crystallite size. • High removal efficiency up to ∼98 % for RhB in 100 min achieved concerning high porosity. • MO and MB are degraded up to ∼93 % in 140 min and ∼97.5 % in 100 min, respectively. • ZnO@Ag nanoplates inactivated environmentally transmitted pathogenic bacteria. [ABSTRACT FROM AUTHOR]

Municipal solid waste (MSW) disposal methods that are not under control, such as open burning, unrestricted incineration, landfilling and dumping into water bodies, pose a severe hazard to the environment and public health. As a result, the development of cheap and ecologically suitable disposal methods is currently extensively demanded by the expanding contemporary communities across the globe. However, the heterogeneous structure and variable physicochemical qualities are a key technical impediment to a total transformation in present conversion methods. Under a green biorefinery strategy, an organic-rich portion of MSW might serve as a low-cost, readily accessible substrate for making fuel and high-value chemicals. The present review examines the new issues in municipal solid waste production and management and the generation of diverse bioproducts with added value. In addition, the conversion of organic waste materials into a variety of biofuels, such as liquids, solids, gases, and power, is discussed in this paper. The most up-to-date methods for turning organic waste into high value bioproducts like compost and organic acids are thoroughly examined. The biorefinery technique is bolstered by converting organic solid waste to high value bioproducts that reduce waste, increase energy output, and provide additional healthcare commodities. As a result, it can be said that recycling MSW into high value bioproducts and biofuels will aid in reaching high levels of energy security, environmental protection, and a more robust bioeconomy. [Display omitted] • The health and environmental consequences of municipal solid waste are reviewed. • Focus on important factors, traditional techniques, issues, and disagreements. • Unlike traditional combustion, gasification is a unique alternative fuel generating technique. • Strategic innovations in dark fermentation could enable the production of clean energy. • Integration of thermochemical and biochemical technology is needed for efficient waste management. [ABSTRACT FROM AUTHOR]