Volume 9 Issue 4 ( December 2022 )

Pages_1244-1251

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

[ABSTRACT ]

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

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