<p>A novel green synthesis method for ternary nanocomposite (gSnO₂/Fe₃O₄@ZIF-8) has been developed. This research presents an environmentally friendly method for the synthesis of gSnO₂/Fe₃O₄@ZIF-8 nanoparticles utilising the juice extracted from Cucumis sativus (Cucumber) peels, entirely omitting the need for external reagents. The influence of diverse reaction parameters, including reaction duration, reaction temperature, and the concentration of Cucumis sativus (Cucumber) peel juice, on the synthesis of nanoparticles has been thoroughly examined. The nanomaterials underwent the Co-precipitation method and were assessed using UV–Visible, FT-IR, XRD, SEM, EDX, SAED, TEM, and XPS analysis techniques. The XRD measurement validated the phase purity of the nanocomposite. The synthesised magnetically separable ternary photocatalyst gSnO₂/Fe₃O₄@ZIF-8 nanoparticles were employed for the elimination of toxic and hazardous dyes, including Victoria Blue and Crystal Violet. An impressive degradation rate of approximately 99.8% for Crystal Violet (CV) and 99.46% for Victoria Blue dye (VB) was observed with the application of gSnO₂/Fe₃O₄@ZIF-8 nanoparticles. Moreover, the photocatalytic performance of the gSnO₂/Fe₃O₄@ZIF-8 nanoparticles remained consistent following five cycles of operation. The application of an external magnet facilitated the separation of the magnetically active ternary photocatalyst from the aqueous suspension, thereby enhancing the efficiency and simplicity of its recycling process.</p>