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Visible-light-driven H₂ production and decomposition of 4-nitrophenol over nickel phosphides

Liu, Xing, Zhao, Lanhua, Wang, Haixia, Lai, Hua, Peng, Gang, Li, Junhua, Yi, Zhengji, Chen, Kang
RSC advances 2018 v.8 no.60 pp. 34259-34265
cost effectiveness, eosin, fuels, hydrogen, hydrogen production, lighting, nickel, p-nitrophenol, phosphides, photocatalysis, pollutants, temperature, toxicity
Photocatalytic H₂ production and photocatalytic decomposition are efficient and economical methods to obtain hydrogen fuel and dispose of organic pollutants. In this paper, amorphous nickel phosphide (Ni₂P) is synthesized by an extremely simple precipitation method under low temperature. The prepared nickel phosphide was not only used to produce H₂ in the presence of Eosin Y as sensitizer and triethanolamine (TEOA) as a sacrificial electron donor but also to degrade 4-nitrophenol under visible light illumination. The rate of hydrogen evolution is 34.0 μmol h⁻¹ g⁻¹ and the degradation efficiency is 25.5% within 4 h at initial 5.0 mg L⁻¹ 4-nitrophenol. Probable photocatalytic mechanisms were discussed. The present work is expected to contribute toward the hydrogen evolution and disposal of highly toxic pollutants by cost-effective photocatalytic means.