Effective Carbon Dioxide Photoreduction over Metals (Fe-, Co-, Ni-, and Cu-)‎ Incorporated TiO2Basalt Fiber Films

Abstract EN

Mineralogical basalt fibers as a complementary adsorbent were introduced to improve the adsorption of CO2 over the surfaces of photocatalysts.

TiO2 photocatalysts (M-TiO2) incorporated with 5.0 mol.% 3d-transition metals (Fe, Co, Ni, and Cu) were prepared using a solvothermal method and mixed with basalt fibers for applications to CO2 photoreduction.

The resulting 5.0 mol.% M-TiO2 powders were characterized by X-ray diffraction, scanning electron microscopy, ultraviolet-visible spectroscopy, photoluminescence, Brunauer, Emmett, and Teller surface area, and CO2-temperature-programmed desorption.

A paste composed of two materials was coated and fixed on a Pyrex plate by a thermal treatment.

The 5.0 mol.% M-TiO2/basalt fiber films increased the adsorption of CO2 significantly, indicating superior photocatalytic behavior compared to pure TiO2 and basalt fiber films, and produced 158~360 μmol g c a t - 1 L−1 CH4 gases after an 8 h reaction.

In particular, the best performance was observed over the 5.0 mol.% Co-TiO2/basalt fiber film.

These results were attributed to the effective CO2 gas adsorption and inhibition of photogenerated electron-hole pair recombination.