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Monoclinic α-Bi2O3 photocatalyst for efficient removal of gaseous NO and HCHO under visible light irradiation

2010; Elsevier BV; Volume: 509; Issue: 5 Linguagem: Inglês

10.1016/j.jallcom.2010.10.132

1873-4669

Zhihui Ai, Yu Huang, Shuncheng Lee, Lizhi Zhang,

Catalytic Processes in Materials Science

The investigation was focused on the visible-light-driven photocatalytic removal of gaseous NO and HCHO at typical indoor air concentration over synthetic α-Bi2O3. Monoclinic α-Bi2O3 was synthesized via calcination of hydrothermally prepared (BiO)2CO3 precursor at 500 °C for 4 h. The synthetic α-Bi2O3 samples were systematically characterized by XRD, SEM, FT-IR, and UV–vis diffuse reflectance spectra (DRS). The optical band gap energy of the resulting α-Bi2O3 was estimated to be 2.72 eV from the UV–vis absorption spectra. Comparing with the commercial Bi2O3 counterpart, the fabricated α-Bi2O3 showed superior visible-light-induced photocatalytic activity on degradation of nitrogen monoxide (NO) and formaldehyde (HCHO) at typical indoor air concentration. No obvious deactivation of synthetic α-Bi2O3 was observed during the prolonged photocatalytic reaction. This work suggests that the synthesized monoclinic α-Bi2O3 with suitable band gap and high activity is promising photocatalyst for indoor air purification.