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A two-dimensional/two-dimensional (2D/2D) TiO₂/ZnIn₂S₄ photocatalyst was reasonably proposed and constructed by a two-step oil bath-hydrothermal method. TiO₂ nanosheets uniformly grown on the surface of ZnIn₂S₄ nanosheets and a synergetic effect between the TiO₂ and ZnIn₂S₄ could highly contribute to improving the specific surface area and hydrophilicity of ZnIn₂S₄ as well as accelerating the separation and transfer of photon-generated e⁻-h⁺ pairs, and thus enhancing the visible-light photocatalytic degradation and H₂ evolution performance of ZnIn₂S₄. Rhodamine B (RhB) and tetracycline (TC) were simultaneously selected as the target pollutants for degradation in the work. The optimum photocatalytic RhB and TC degradation properties of TiO₂/ZnIn₂S₄-10 wt% were almost 3.11- and 8.61-fold higher than that of pure ZnIn₂S₄, separately, while the highest photocatalytic hydrogen evolution rate was also observed in the presence of TiO₂/ZnIn₂S₄-10wt% and 4.28-fold higher than that of ZnIn₂S₄. Moreover, the possible photocatalytic mechanisms for enhanced visible-light photocatalytic degradation and H₂ evolution were investigated and proposed in detail. Our research results open an easy pathway for developing efficient bifunctional photocatalysts.