Study of Photocatalytic Activities with Copper Hydroxyphosphate

Abstract

Copper hydroxyphosphate,as self-assembled nanoparticles, was synthesized by using a hydrothermal method,with cupric acetate (Cu(CH3COO)2·H2O) and diammonium hydrogen phosphate ((NH4)2HPO4) as raw materials. Physical property of copper hydrophosphate was characterized by X-ray diffraction (XRD), Field-emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and Ultraviolet obvious diffuse reflection(UV-vis DRS). No surfactants or templates were added in the procedure of preparation. By simply adjusting the pH from 3 to 9, the morphology of copper hydrophosphate varied from microrods to walnutshaped microspheres. Photocatalytic activity of the samples was also investigated. Photo decoloration of Rhodamine B in water under visible light irradiation shows that copper hydrophosphate (pH=7) have the best photocatalytic activity: Photodecoloration activity of 100 mL Rhodamine B (10 mg/L) was 98 % under illumination for 30 min.

Self-Assembled 3D Hierarchical Copper Hydroxyphosphate Modified by the Oxidation of Copper Foil as a Recyclable, Wide Wavelength Photocatalyst

“…The tails of the absorption band can be extended to the NIR zone. The absorption of the UV-light region is mainly attributed to the electron transition from the valence band to the conduction band, visible-light region caused by the surface structure of CHP 16 and NIR light resulted from the electronic structure of CHP, in which axially elongated CuO 4 (OH) 2 octahedra share their corners with axially compressed CuO 4 (OH) trigonal bipyramids. 8 It is verified that the as-obtained CHP materials are wide wavelength photocatalysts, which can enlarge the spectral response and enhance the utilization of sunlight.…”

“…For CHP photocatalysts, the 3D hierarchical structure with large void spaces is beneficial due to the large specific area and facile mass transport. , To meet the demand, much effort has been devoted to the controllable synthesis of CHP with particular morphologies, including one-dimensional (1D) triangular prism, , 3D walnut-shaped, peony-like, and truncated bipyramidal . However, simple and ligand-free fabrication of CHP micro- or nano-architectures at the microscopic level is still an important challenge.…”

“…However, simple and ligand-free fabrication of CHP micro- or nano-architectures at the microscopic level is still an important challenge. Currently, scientists have reported some research studies in fabricating 3D CHP hierarchical structures using different methods (such as wet-chemical, surfactant-assisted solvothermal, , and ionic liquid-assisted) and these synthetic processes often require a ligand, which hinders the photocatalytic degradation of dye pollutants and restricts the wider environmental application of a photocatalyst, indicating that they are not suitable for widespread commercial applications. Furthermore, without hydrogen peroxide or any other electronic capture agent, existing CHP photocatalytic degradation efficiency is relatively low.…”