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Deep eutectic solvents (DESs), a new class of ionic liquids, have been considered to be the focus of researchers owing to their wide range of applications as green solvents. These solvents are involved in changing the size and morphology of nanomaterials during their synthesis. In this work, we have synthesised WO3–MgO nanocomposite using a DES prepared from cetyltrimethylammonium bromide (CTAB), urea and glycerol, which proved to enhance the pore volume of the composite. The X-ray diffraction peak patterns revealed a monoclinic arrangement for WO3 and cubic for MgO. The morphological and surface characterization studies were performed using scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectra and adsorption-desorption isotherms. The crystal qualities were obtained from Raman spectra and the band gap energy of WO3 increased upon forming a composite with MgO. The temperature dependent electrical conductivities and the dielectric and electric modulus properties of WO3–MgO were studied and from electrochemical studies, the specific capacitance value obtained was 272.5 F g−1 at a current density of 1 A g−1. [ABSTRACT FROM AUTHOR]

Correction and removal of expression of concern for 'Deep eutectic solvent mediated synthesis and fabrication of a WO3–MgO nanocomposite as an electrode material for energy storage applications' by C. Joel et al., New J. Chem., 2023, 47, 2797–2808, https://doi.org/10.1039/D2NJ05642A. [ABSTRACT FROM AUTHOR]

The effectual removal of arsenic ions from contaminated water sources remains a significant challenge in water treatment. In this study, we propose a novel composite material consisting of kaolin, graphitic carbon nitride (g-C 3 N 4) and tungsten trioxide (WO 3) for effective arsenic removal. The composite material was prepared through a facile synthesis method, and its physicochemical properties were characterized using various analytical techniques. The effects of composite dosage, initial arsenic concentration, contact time and temperature on the adsorption capacity were systematically evaluated. The results revealed that the composite material exhibited excellent arsenic removal efficiency, with a maximum adsorption capacity of 114.63 mg/g. The adsorption isotherms such as Langmuir and Freundlich models were evaluated, and the data finds to fit well with the Langmuir model, suggesting homogeneous adsorption. The mechanism of arsenic removal follows photocatalytic oxidation of As(III) to As(V) followed by adsorption of As(V). The process of adsorption followed the pseudo-second-order kinetic model. Additionally, the composite material demonstrated good reusability and stability over multiple cycles. The findings of this study contribute to the progress of sustainable and reliable water treatment technologies for arsenic removal, addressing a pressing global environmental concern. [Display omitted] • Kaolin/g-C 3 N 4 /WO 3 nanocomposite has been synthesized and characterized. • This nanocomposite was employed for the effective removal of arsenic ions. • Synergistic effect of photocatalytic oxidation/adsorption is involved in arsenic removal. • The composite material was proved to be cost effective and recyclable. [ABSTRACT FROM AUTHOR]