International Science Community Association Research Journal of Chemical Sciences 16 3 2026 10 18 Evaluation of Synthesized S, N-CQDS/ZNCo2O4 Heterojunction Nanocomposite as an Efficient Photocatalytic Decolourisation of Organic Pollutants under Visible Light Irradiation 13 17 EN Mohammed Jibrin 1 Department of Chemistry, Faculty of Natural & Applied Sciences, Nasarawa State University, Keffi, Nigeria Aremu Matthew Olaleke 2 Department of Chemistry, Faculty of Physical Sciences, Federal University of Lafia, Nigeria Usman Abdullahi 3 Department of Chemistry, Faculty of Physical Sciences, Federal University of Lafia, Nigeria Pare Brijesh 1 Department of Photochemistry, Govt. Madhav Science P.G. College, Ujjain, M.P., India Geed Poonam 2 Department of Photochemistry, Govt. Madhav Science P.G. College, Ujjain, M.P., India > Research Paper 2026 7 11 2026 10 18 New synthesized materials exhibit promising applications as photocatalysts for ecological rehab and better usage of non-conventional energy source i.e. Sun. Semiconductor-based photocatalysts have been massively utilized for the overall elimination or fading of organic pollutants from wastewater in the presence of solar light irradiation. The heterojunction photocatalyst was synthesized by decorating S, N-CQDs onto the surface of ZnCo2O4 nanomaterials. The structural and morphological features of the developed material were analysed using powder X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and energy–dispersive X-ray spectroscopy (EDX) analyses. It was found that the morphology of the prepared sample was spherical in shape. The EDX-Spectrum of the nanocomposite revealed the existence of Zn, Co and O elements. The photocatalytic activity of the prepared catalyst was evaluated for the degradation calmagite dye an organic dye was found to be 85% after 90 min of solar light irradiation. Copyright@ International Science Community Association