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Solar-driven photocatalysis has been known as one of the most potential technologies to tackle the energy shortage and environmental pollution issues. Utilizing bio-pollutants to prepare functional materials has been considered as a green option. Herein, we used <i>Microcystis aeruginosa</i> as a bio-template to fabricate a <i>Microcystis</i>@<i>TiO₂</i> photocatalyst using a calcination method. The as-prepared <i>Microcystis</i>@<i>TiO₂</i> showed prominent ability as well as favorable stability for photocatalytic reduction reactions including hydrogen evolution and nitrogen fixation. Under light illumination, <i>Microcystis</i>@<i>TiO₂</i> calcined at 550 °C exhibited optimal photo-reduced activity among all samples, with the highest hydrogen evolution (1.36 mmol·g⁻¹·h⁻¹) and ammonia generation rates (0.97 mmol·g⁻¹·h⁻¹). This work provides a feasible approach to prepare functional materials from disposed pollutants.