| Summary: | This paper presents new photocatalysts obtained by treating carbon spheres (CS) and TiO<sub>2</sub> in a microwave reactor at a pressure of 20 atm and a temperature of up to 300 °C for 15 min and then depositing TiO<sub>2</sub>/CS composites on glass fibre cloths. Such highly CO<sub>2</sub>-adsorbing photocatalysts showed photoactivity in the simultaneous water-splitting process, generating H<sub>2</sub>, reducing CO<sub>2</sub> to CO and CH<sub>4</sub>, and reducing N<sub>2</sub> to NH<sub>3</sub>. In addition, calculations of the hydrogen balance involved in all reactions were performed. Adding 1 g of carbon spheres per 1 g of TiO<sub>2</sub> maintained the high selectivity of nitrogen fixation at 95.87–99.5%, which was continuously removed from the gas phase into the water as NH<sub>4</sub><sup>+</sup> ions.
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