Akıllı, A.Haspulat, Taymaz, B.Özler, A.Ak, H.Hancı, A.Kamış, H.2024-11-102024-11-1020251522-65141549-7879https://doi.org/10.1080/15226514.2024.2416998https://hdl.handle.net/20.500.13091/6570This study was aimed at the preparation of m-Co3O4 NPs (magnetic Co3O4 nanoparticles) from sunflower seed meal (SFSM) which is the waste of sunflower seed oil factories, and their application as a photocatalyst for the adsorption assistant photocatalysis degradation of methylene blue (MB), and direct yellow-50 (DY-50) under the visible irradiations. Also, the photocatalytic performance of m-Co3O4 NPs was evaluated in synthetic wastewater. The produced m-Co3O4 NPs were ferromagnetic with a saturation magnetization value of 4.3 emu g−1 and the degradation of cationic MB and anionic DY-50 dyes by 100% and 93% in 20 min and 35 min, respectively, by adsorption-assisted photocatalytic process under visible light was achieved. The reactions were found to be pseudo-second-order equation for the adsorption-assisted photocatalytic process for both dyes. The photocatalytic activity of m-Co3O4 NPs decreased slightly even after five repeated cycles. These results show that the m-Co3O4 NPs can be used successfully in dye treatment in wastewater with their adsorption-assisted photocatalytic properties, activation by visible light, magnetic separability, and low-cost production. © 2024 Taylor & Francis Group, LLC.eninfo:eu-repo/semantics/closedAccessAdsorption assisted photocatalysisgreen synthesismagnetic nanoparticlessunflower seed wasteArticle10.1080/15226514.2024.24169982-s2.0-85206899747