纳米二氧化钛负载银离子 Ag-TiO₂ 的可见光催化还原CO₂ 性能研究

TiO₂ P25 quasi-nanocubes with an average size of about 25 nm were used as catalysts for CO₂ photoreduction, and the results showed that the particle size of silver nanoparticles and their distribution on the surface of TiO₂ P25 nanocubes were significantly influenced by the amount of silver loaded, which led to significant differences in the activity and selectivity of CO₂ photocatalytic reduction to CO/CH₄. The effect of the reactant flow rate on the catalytic reaction was also investigated. The different catalysts showed the best reactivity at the reactant flow rate of 200 mL·min⁻¹, where the tangential material exchange was relatively intense, while the boundary layer on the catalyst surface was relatively thin and did not hinder the adsorption and desorption processes between the catalyst and the reactants. The 1.0% Ag- TiO₂ P25 showed the highest total activity at a reactant flow rate of 200 mL·min⁻¹ with a CO/CH₄ generation rate of 1670.36/181.08 µL·(h·g)⁻¹, which increased the CO generation activity by 39.38% and the CH₄ generation activity was 3.75 times higher than that of the pristine TiO₂ P25. The results of this study provide an important basis for the effect of silver loading on the activity and selectivity of the CO₂ photoreduction reaction on the exposed surface of TiO₂ P25 titanium dioxide and demonstrate a strategy to modulate the CO₂ photoreduction performance by changing the morphology and surface structure of TiO₂ P25.