Regeneration study of MB in recycling runs over nickel vanadium oxide by solvent extraction for photocatalytic performance for wastewater treatments

• Published in: Environmental research Vol. 211; p. 112970
• Main Authors: George, Amal, Dhayal Raj, A., Albert Irudayaraj, A., Josephine, R.L., Venci, X., John Sundaram, S., Rajakrishnan, R., Kuppusamy, Palaniselvam, Kaviyarasu, K.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier Inc 01.08.2022
• Subjects: Microspheres; NiV2O6 nanorods; Photocatalytic activity; Recyclability; UV absorbance; Microspheres; Photocatalytic activity; NiV2O6 nanorods; UV absorbance; Recyclability; NiVO nanorods
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2022.112970

Recently, researchers are concentrating on the synthesis of composite materials to enhance the efficiency of the materials in various applications. In this work, nickel vanadium oxide (NiV2O6) nanocomposite material is prepared via two methods and the prepared samples have been characterized with basic studies to analyse the effect of preparation method and the reaction time. The XRD studies reveal a polycrystalline growth in both the methods. The broad XRD peaks obtained for samples prepared via hydrothermal method suggests the size reduction and 1D nanostructure formation. The SEM analysis shows the formation of 1D structures in hydrothermal and 3D microsphere structures in solvothermal methods. The possible formation mechanism behind this formation has been discussed in this manuscript. The FTIR peaks in the fingerprint region confirm the formation and vibration of metal-oxygen bonds. The large optical bandgap values obtained from Tauc plot again confirms the formation of nanostructures of the synthesized samples. The photocatalytic activity of nickel vanadium oxide on methylene blue dye under halogen light were performed and, the recyclability of the sample is investigated. It was found from the photocatalytic spectrum that, the samples prepared from both the methods shows a degradation efficiency of more than 80% within 150 min. It was confirmed that the prepared NiV2O6 photocatalyst samples does not lose their degradation ability even after five cycles of repeated usage. [Display omitted] •Solvothermal method has an optical bandgap of 2.49 eV for 12 hours.•Hydrothermal show a bandgap of 2.40 eV for 12 hours.•2p oxygen groups and the 3d band of vanadium has been reported with V2O5.•PEG is used as a solvent, a tendency to form 3-D microspheres is evident.•∼750 cm-1 to ∼830 cm−1 are due to V–O vibration and V-O-V stretching vibration.