Transition metal-doped SnO 2 and graphene oxide (GO) supported nanocomposites as efficient photocatalysts and antibacterial agents.

Autor: Munawar T; Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Nadeem MS; Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Mukhtar F; Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Rehman MNU; Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Riaz M; Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Batool S; Institute of Bio-Chemistry, Bio-Technology, and Bioinformatics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Hasan M; Institute of Bio-Chemistry, Bio-Technology, and Bioinformatics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan., Iqbal F; Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan. faisal.iqbal@iub.edu.pk.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2022 Dec; Vol. 29 (60), pp. 90995-91016. Date of Electronic Publication: 2022 Jul 26.
DOI: 10.1007/s11356-022-22144-3
Abstrakt: In the present work, pristine and transition metal (TM) (W, Ag, Zn)-doped SnO 2 nanocrystals using a facile sol-gel approach were synthesized. The grown products were anchored on graphene oxide (GO) sheets via a simple ultrasonication technique to fabricate binary nanocomposites. The structural, optical, and morphological properties of as-synthesized samples were studied by XRD, FTIR, Raman, EDX, UV-Visible, PL, and FE-SEM. The charge transferability of graphene oxide-based samples was investigated by EIS. The XRD exhibited the TM doping in SnO 2 and the development of GO-based nanocomposite. FTIR data evidenced the existence of the metal-oxygen bonds. Raman spectra presented the optical phonon modes of SnO 2 and the existence of oxygen vacancy defects. FE-SEM images demonstrated the anchoring of particles on the GO sheet, and EDX further approved the existence of desired dopants. The integration of SnO 2 with TM doping remarkably reduced optical bandgap (3.65-3.10 eV), which was further decreased (3.10-2.99 eV) by making composite with GO. The photodegradation results exhibited that GO-based nanocomposites have the higher potential to degrade synthetic dyes (methyl red (MR), and methyl orange (MO) and SnZnO 2 /GO have shown superb photocatalytic performance after 80-min sunlight illumination (99.9% MR and 95.0% MO dyes) with the higher rate constant and superior stability up to 6th cycle against MR dye. The grown samples were tested for bacterial disinfection, and SnZnO 2 /GO sample showed a higher zone of inhibition towards S. aureus and K. pneumoniae bacteria strains. The greater charge transfer rate and lower recombination of charge carriers in GO-based composites were also observed by EIS and PL analysis. Moreover, the present article ascribed that the photocatalytic and antibacterial properties of bare SnO 2 could be improved by TM doping and fabricating their composite with GO.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE