Synthesis and Catalytic Performance of a New V-doped CeO₂-supported Alkali-activated-steel-slag-based Photocatalyst

Abstract

A novel V-doped CeO₂-supported alkali-activated-steel-slag-based catalyst (V-CeO₂/AC) for photocatalytic decomposition of water to hydrogen was prepared via co-impregnation method. The chemical composition, mineral phase, morphology, and optical performances of the synthesized catalyst samples were characterized by XRF, XRD, SEM, UV-Vis DRS, and so on. XRD and SEM results show that calcium silicate hydrate (Ca_1.5SiO_3.5·xH₂O) mineral phase is formed in the carrier sample, and the prepared catalyst specimens are made up of approximately 50 nm particles. After 6 hours of xenon lamp irradiation, the catalyst supported on V-doped 8wt% CeO₂ exhibits the highest photocatalytic hydrogen production activity (8 292 µmol/g), which is attributed to the interaction between the V-doped CeO₂ active components and FeO existed in catalyst carrier. A possible photocatalytic decomposition of water for hydrogen production mechanism over the V-8CeO₂/AC catalyst was proposed.

Keywords

V-doped CeO₂ / alkali-activated-steel-slag-based catalyst / photocatalysis / water splitting / hydrogen production

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