New evidence for the photocatalytic efficiency of natural raw vermiculites to produce hydrogen from aqueous methanol solution.

ABSTRACT: The potential of vermiculites as environmentally friendly photocatalysts for hydrogen production and pollutant degradation was demonstrated by a photocatalytic test in an aqueous 50 % methanol solution (MeOH50). After 4 h of irradiation with the commercial TiO₂ Evonik P25 catalyst, the H₂ yield was of 656.9 ± 4.2 μmol/g_cat. For vermiculites Vm1, Vm3, and Vm4, hydrogen yields were comparable (H₂ = 420.6 ± 5.8 μmol/g_cat; H₂ = 414.2 ± 1.8 μmol/g_cat, and 449.3 ± 1.8 μmol/g_cat, respectively) but were lower in the presence of vermiculite-chlorite intermediate Vm2 (H₂ = 385.1 ± 6.6 μmol/g_cat). After the extended 24-h irradiation, hydrogen yield was promoted by the negative tetrahedral charge, while the positive octahedra

SUBMITTER: Valaskova M 

PROVIDER: S-EPMC11874548 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature