Coherent Bi2O3-TiO2 hetero-junction material through oriented growth as an efficient photo-catalyst for methyl orange degradation. (June 2018)

• Record Type: Journal Article
• Authors: Wang, Ce; Tan, Chao; Lv, Weiqiang; Zhu, Gaolong; Wei, Zhaohuan; Zhang, Kelvin H.L.; He, Weidong
• Is Part Of: Materials today chemistry. Volume 8(2018)
• Page Start: 36
• Page End: 41
• Publication Date: 2018-06
• Subjects: Colloidal synthesis -- Bismuth oxides -- Hetero-junction -- Photo-catalyst; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2018.02.005
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: In this work, we report the synthesis of a Bi2 O3 -TiO2 hetero-junction (HJ) material through a facile colloidal method. The hetero-junction formation follows a growth with a 145°Bi2 O3 /TiO2 crystal angle, owing to the large lattice mismatch between Bi2 O3 and TiO2 crystals. With the Bi2 O3 -TiO2 hetero-junction material as a photocatalyst, methyl orange is degraded completely within two hours under common UV-lamp irradiation. The photo-catalyst remains highly-active for complete photo-degradation of methyl orange even after multiple experiments. The remarkable photo-catalytic properties are attributed to the remarkable mono-dispersivity of the colloidal Bi2 O3 -TiO2 nano-structure as well as the refined band structure with a valence band of 0.85 eV below that of TiO2 crystal. Highlights: A colloidal method is employed to prepare coherent Bi2 O3 -TiO2 hetero-junction. The hetero-junction owns a refined band structure. The degradation efficiency reaches 100% within two hours. The method is promising for large scale applications.