Abstract
A facile method was developed to enhance the visible light photocatalytic activity of bismuth oxide formate (BiOCOOH) nanosheets via Br-doping. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, the Brunauer–Emmett–Teller surface area, UV-vis diffuse reflectance spectroscopy, photoluminescence spectra, and N2 adsorption-desorption isotherms measurement. The Br− ions replaced the COOH− ions in the layers of BiOCOOH, result in a decreased layer distance. The photocatalytic activity of the as-prepared materials was evaluated by removal of NO in qir at ppb level. The results showed that the Br-doped BiOCOOH nanosheets showed enhanced visible light photocatalytic activtiy with a NO removal of 37.8%. The enhanced activity can be ascribed to the increased visible light absorption and the promoted charge separation.
Highlights
Photocatalysis is a green technology with wide applications in solar energy conversion, environmental remediation and selective organic synthesis [1,2,3,4]
To extend the light absorption spectra of BiOCOOH into visible light region, we developed a simple ion-exchanging method for Br-doped BiOCOOH
The enhanced visible light absorption should be ascribed to Br-doping which leads to narrowed band gap
Summary
Photocatalysis is a green technology with wide applications in solar energy conversion, environmental remediation and selective organic synthesis [1,2,3,4]. In the past few decades, TiO2, ZnO and other such kinds of photocatalytic materials have been investigated They cannot utilize the solar energy effectively due to their wide band gap, which limits their visible-light induced practical applications [5,6,7,8,9]. Only BiOI and BiOBr are visible light responsive semiconductor photocatalysts, whereas BiOCl, (BiO)2CO3 and BiOCOOH can only be excited by UV light due to their wide band gap. To extend the light absorption spectra of BiOCOOH into visible light region, we developed a simple ion-exchanging method for Br-doped BiOCOOH. BiOCOOH exhibited more efficient visible light activity than pure BiOCOOH as Br-doping could improve the visible light absorption and charge separation. This work has demonstrated a new strategy for modification of layered photocatalyst via ion exchange
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