Journal
NEW JOURNAL OF CHEMISTRY
Volume 38, Issue 6, Pages 2462-2469Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nj01488f
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2012R1A1A4A01005951]
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This paper reports the defect-induced band gap narrowing of pure SnO2 nanostructures (p-SnO2) using an electrochemically active biofilm (EAB). The proposed approach is biogenic, simple and green. The systematic characterization of the modified SnO2 nanostructures (m-SnO2) revealed EAB-mediated defects in the pure SnO2 nanostructures (p-SnO2). The modified SnO2 (m-SnO2) nanostructures in visible light showed the enhanced photocatalytic degradation of p-nitrophenol and methylene blue compared to the p-SnO2 nanostructures. The photoelectrochemical studies, such as the electro-chemical impedance spectroscopy and linear scan voltammetry, also revealed a significant increase in the visible light response of the m-SnO2 compared to the p-SnO2 nanostructures. The enhanced activities of the m-SnO2 in visible light was attributed to the high separation efficiency of the photoinduced electron hole pairs due to surface defects mediated by an EAB, resulting in a band gap narrowing of the m-SnO2 nanostructures. The tuned band gap of the m-SnO2 nanostructures enables the harvesting of visible light to exploit the properties of the metal oxide towards photodegradation, which can in turn be used for environmental remediation applications.
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