Royal Society of Chemistry

Sabtu, 12 Mei 2018 10:27 | Sudah dibaca 900 kali

Noble metal-free Zn(O,S)/Ga₂O₃ nanocomposite photocatalysts containing different amounts of Ga₂O₃ have been synthesized using a precipitation method at 90 ^oC. The as-prepared catalysts were characterized and their composite nature was confirmed. The Zn(O,S)/Ga₂O₃ catalysts were examined for their ability to evolve hydrogen under low UV light illumination (0.088 mW cm^-2) and to provide hydrogen for 4-nitropenol (4-NP) reduction. Gas chromatography measurement revealed and high-performance liquid chromatography (HPLC) measurements confirmed the formation of 4-aminophenol (4-AP) as a product of 4-NP reduction. The heterojunction formation between the Zn(O,S) and Ga₂O₃ phases enhanced the photocatalytic activity, compared to the single Zn(O,S) and Ga₂O₃ phases. Surface oxygen anions and oxygen vacancies played important roles in the photocatalytic mechanism to evolve hydrogen and to utilize hydrogen ions in 4-NP reduction. The photocatalytic hydrogen evolution reaction and its utilization for 4-NP reduction to 4-AP were evaluated and elucidated in this work.

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