Preparation of Ce³⁺doped Bi₂O₃ hollow needle-shape with enhanced visible-light photocatalytic activity

Wenwen Zhang¹，Shaomin Gao²，Donghui Chen^1,2

1. College of Environmental Science and Engineering, Donghua University2. College of Chemical and Environmental Engineering, Shanghai Institute of Technology

摘 要：Ce³⁺ doped Bi₂O₃ hollow needle-shape with enhanced visible-light photocatalytic activity was successfully prepared via the method of chemical precipitation using Bi（NO₃）·5H₂O and Ce（NO₃）₃·6H₂O as the source of bismuth and cerium, HNO₃ as solvent and NaOH as precipitants, respectively and after calcination at 500 ℃ for 2 h. The morphology and elemental composition,crystal form,purity and specific surface area of the hollow needle Bi₂O₃ were characterized by SEM-EDS, XRD, BET and FT-IR. The photocatalytic properties of the as-obtained samples were measured by UV-vis diffuse reflection spectroscopy and photochemical reactor. As a result, the obtained Bi₂O₃ hollow needle-shape doped with 5 wt% Ce shows good morphology, α-phase, stronger absorbent for visible light and good photocatalytic property. Under the simulated visible light of 300 W, the photodegradation rate of tetracycline over HNBCe can reach to 89.1%,which is higher than that of commercial Bi₂O₃ nanoparticles and Bi₂O₃ hollow needle-shape.

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