Upscale production of hybrid magnetic ZnFe2O4/TiO2 nanocomposites (ZFTs) with various mass loading of 30–90 wt% TiO2 was synthesized to improve the water splitting and hydrogen production via photocatalytic process under visible irradiation. Physicochemical characteristics such as structure, morphology, magnetic, and photocatalytic activities were studied in details. The TEM observations confirm that ZnFe2O4 and TiO2 are strongly coupled as spherical nanoparticles around 6–8 nm. The absorption of TiO2 was shifted to the visible region and the lowest PL intensity of ZFT70 nanocomposite exhibited superior photocatalytic activity compared to the other nanocomposites. The ZFT70 photocurrent was five times higher than single TiO2 and ZnFe2O4 phases, indicating enhanced photo induced electron and hole separation. This can be considered earnest green technology process for harvesting …