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In this paper, the bismuth vanadate and the composite of bismuth vanadate BiVO4 with nickel ferrite BiVO4/NiFe2O4 is aimed to be synthesized using hydrothermal method for the effective degradation of methylene blue. The concentration of nickel ferrite is varied from 1 to 5%. The morphological, structural, and the optical properties of the prepared samples are studied using X-ray diffraction (XRD), Scanning electron microscope (SEM), Photoluminescence (PL) spectroscopy, and Ultra-violet (UV) spectroscopy. The photocatalytic activity of the prepared photocatalyst is performed under visible light. The composite of BiVO4/NiFe2O4 4% efficiently degrade 99% of methylene blue after 90 min from 100-ml solution under visible light. This paper explains the synthesis of bismuth vanadate and it is composite with nickel ferrite BiVO4/NiFe2O4 and give information about the structural and morphological of these synthesized materials. [ABSTRACT FROM AUTHOR]

In this study, Mg2+ ions-doped ZnO nanorods were prepared via simple solvothermal method. The prepared samples were characterized by XRD, TEM/SEM, EDX, UV–visible and PL emission spectroscopy to explore the structural, morphological and optical properties, respectively. The XRD results reveal that Mg2+ ions-doped ZnO/MgO nanocomposite exhibited the hexagonal wurtzite structure of ZnO. However, the incorporation of Mg2+ ions into ZnO has shifted the XRD peaks towards lower 2Ө angles which might be due to successful incorporation of Mg2+ ions into ZnO lattice. Moreover, the prepared ZnO, MgO and MgO/ZnO nanocomposites with various Mg to Zn atomic ratios (2–11%) were used as photocatalyst for the degradation of MB and RhB dyes under visible light irradiation. The sample with 8% doping (8%MgO/ZnO) showed excellent photocatalytic performance for both dyes as compared to pure ZnO and other samples. Furthermore, the cyclic stability of 8% MgO/ZnO nanocomposite was also monitored for the degradation of RhB dye, the results show that the prepared nanocomposite has good stability and long-term durability after five consecutive cycles. The current study suggests that ZnO/MgO-based nanocomposites could be proficiently used in numerous applications especially in environmental and energy applications. [ABSTRACT FROM AUTHOR]

Water contamination caused by the organic pollutants and microorganism is the serious risk towards the human life and aquatic ecosystem that can be addressed by active and environment-friendly nanoparticles. In current work, Zinc oxide nanoparticles (ZnO-NPs) have been synthesized first time by utilizing leaves extract of Citrus reticulata via facile, cost effective and ecofriendly green approach. Moreover, the influence of leaves extract concentration on properties of synthesized nanoparticles was also inspected. Various characterization techniques results affirmed that the synthesized ZnO-NPs have hexagonal crystalline structure with size range of 43.05–30.67 nm and band gap of 3.26–3.15 eV. Variation in the leaves extract concentration affected the morphology and optical properties of the green synthesized NPs. Further, the synthesized ZnO-NPs were employed as a photocatalyst for photodegradation of Rhodamine B dye. ZnO-NPs were also employed as antibacterial agent against gram-positive (S. aureus) and gram-negative (E. coli) bacteria where they exhibited appreciable antibacterial activity. Therefore, the novel, facile and green synthesized ZnO-NPs are promising for simultaneous removal of organic pollutants and bacteria from polluted water. [Display omitted] • Cost effective and eco-friendly fabrication of zinc oxide nanoparticles (ZnO-NPs) via green approach. • Leaves extract of Citrus reticulata is utilized first ever for the fabrication of ZnO-NPs. • ZnO-NPs was utilized as a photocatalyst to degrade the Rhodamine B dye from polluted water. • ZnO-NPs exhibited an efficient antibacterial application against both gram-negative and gram-positive bacteria. • ZnO-NPs have the potential to remove the pollutants and pathogens from the polluted water. [ABSTRACT FROM AUTHOR]