A novel magnetic HS−-adsorptive nanocomposite photocatalyst (rGO/CoMn2O4–MgFe2O4) for hydrogen fuel production using H2S feedA novel magnetic HS−-adsorptive nanocomposite photocatalyst (rGO/CoMn2O4–MgFe2O4) for hydrogen fuel production using H2S feed Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2025-06-022023enSynthesis of low-cost, eco-friendly, semiconducting solar-energy materials with excellent photocatalytic activity [high surface area, good reactant adsorption, photon harnessing in the visible region, and low charge recombination] for application in pollutant conversion to hydrogen is of great importance from environmental remediation as well as green energy and fuel production perspectives. In the present work, a magnetic heterojunction of CoMn2O4/MgFe2O4 and reduced graphene oxide (rGO) was synthesized through a combined Hummers’/hydrothermal method. The obtained nanocomposite (rGO/CoMn2O4–MgFe2O4) was employed for photocatalytic conversion of H2S feed into hydrogen fuel. Adsorption studies in the feed solution proved a good capability for the photocatalyst to adsorb HS− reactant from the reaction medium. This effect was ascribed to the presence of the CoMn2O4 component, serving as a strong bisulfide adsorbent. VSM (vibrating sample magnetometry) analysis revealed that the magnetic property of the photocatalyst was due to the MgFe2O4 component. Photocatalytic investigations showed that the addition of rGO to the CoMn2O4/MgFe2O4 nanocomposite not only improves its reactant adsorption capacity, but also increases the photocatalyst surface area, enhances photon absorption, and suppresses the charge (e/h) recombination, which eventually boosts the photocatalyst activity to produce more hydrogen fuel (∼1.5 times).http://creativecommons.org/licenses/by-nc/4.0/Materials Advances4215252–5262Ghanimati_et_al_Mater. Adv._4(21)_2023.pdfChania [Greece]Library of TUC2025-06-02application/pdf2.8 MBfree Ghanimati Majid Lashgari Mohsen Montagnaro Fabio Binas Vassilios Konsolakis Michail Κονσολακης Μιχαηλ Balsamo Marco Royal Society of Chemistry Photocatalysts TiO2 Photocatalysis CoMn2O4-MgFe2O4 Reduced graphene oxide (rGO) Nanocomposite (rGO/CoMn2O4-MgFe2O4) Hydrogen fuel production