Cu₂(OH)PO₄/g-C₃N₄ composite as an efficient visible light-activated photo-Fenton photocatalyst
2015
Chen, Changhong | Zhou, Yan | Wang, Ningning | Cheng, Linyu | Ding, Hanming
Novel Cu₂(OH)PO₄/g-C₃N₄ composites with different mass percentages of Cu₂(OH)PO₄ have been prepared successfully for the photo-Fenton photocatalytic process. By combining the Fenton reagent of Cu₂(OH)PO₄/H₂O₂ with the photocatalyst of g-C₃N₄, the Fenton reaction is highly accelerated with the aid of the photocatalytic process. The composite with 30% Cu₂(OH)PO₄ shows the best photo-Fenton photocatalytic efficiency with a reaction rate constant of 0.093 min⁻¹, which is about 12 and 2.4 times higher than that of pure Cu₂(OH)PO₄ (0.0076 min⁻¹) and pure g-C₃N₄ (0.039 min⁻¹) under the same conditions, respectively. Moreover, the Cu₂(OH)PO₄/g-C₃N₄ composite is very stable and reusable. A possible photo-Fenton photocatalytic reaction mechanism for the Cu₂(OH)PO₄/g-C₃N₄ composite was proposed based on the band structures of Cu₂(OH)PO₄ and g-C₃N₄ as well as the previous research results. We confirm that hydroxide radicals and holes play main roles during the photo-Fenton photocatalytic process. Above all, the Cu₂(OH)PO₄/g-C₃N₄ composite as a stable, highly efficient, and economic photo-Fenton photocatalyst shows potential applications for the treatment of organic pollutants in wastewater.
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