Volume 9 Issue 4 ( December 2022 )


Photocatalytic Hydrogen Production Using Fe-Graphene/TiO2 Photocatalysts in the Presence of Polyalcohols as Sacrificial Agents

Mu’to Naimah, Farashinta Dellarosa Nanda Pratama, Muhammad Ibadurrohman


Modifications of TiO2 in photocatalytic hydrogen production have been widely studied to resolve its limitations in harnessing visible light and electron-hole recombination. Among them is by the combination of Graphene and Fe dopant. This study examines the effects of various concentrations of Fe on Fe-Graphene/TiO2 and various polyalcohols as sacrificial agents for H2 production. Graphene/TiO2 and Fe-Graphene/TiO2 were synthesized by a wet-impregnation method. Characterizations were applied on TiO2 P25, Graphene/TiO2, and Fe-Graphene/TiO2, using XRD, SEM-EDX, UV-Vis DRS, and FTIR techniques to analyze the properties of the catalysts. H2 production experiment was carried out for 5 h in a reactor that enables internal illumination, equipped with a 20W UV lamp, burette, and cooling water. GC analysis of gas sample on the burette confirmed the formation of hydrogen. The accumulation of H2 products indicated that 0.2% Fe on Fe-Graphene/TiO2 with a bandgap of 3.03 eV offers up to 80% higher H2 production than TiO2 P25. Photocatalytic H2 production with Fe-Graphene/TiO2 and 10% v/v alcohols as sacrificial agents were revealed to decrease in the following order: glycerol > ethylene glycol > methanol > propylene glycol > n-propanol. Correlations were obtained between H2 yield and key alcohol properties, notably the number of α-H, polarity, and oxidation potential of the alcohols.

Keywords: Fe-Graphene/TiO2; Hydrogen; Photocatalytic; Polyalcohol; Sacrificial Agent