Novel visible-light irradiation niobium-doped BiOBr microspheres with enhanced photocatalytic performance
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Novel visible-light irradiation niobium-doped BiOBr microspheres with enhanced photocatalytic performance Zhiping Wei1, Xiaoli Dong1,* Hongchao Ma1 1
, Nan Zheng1, Yu Wang1, Xiufang Zhang1, and
School of Light Industry and Chemical Engineering, Dalian Polytechnic University, #1 Qinggongyuan, Dalian 116034, People’s Republic of China
Received: 17 June 2020
ABSTRACT
Accepted: 1 September 2020
A series of niobium-doped BiOBr (Nb-BiOBr) were successfully synthesized via hydrothermal method. Moreover, the morphology structure and optical property of BiOBr and Nb-BiOBr samples were determined using various characterization techniques including SEM, TEM, EDS, BET, XRD, XPS and DRS, etc. The photocatalytic performance of Nb-BiOBr was deeply investigated with the rhodamine B and ofloxacin degradation under visible-light irradiation as model reaction. The results showed that Nb-BiOBr samples depicted the outstanding photocatalytic performance, especially for the 1.25Nb-BiOBr. Moreover, its reaction kinetic constant was ca. 6.4 times higher than that of undoped BiOBr. The observed photocatalytic performance could be attributed to the strong light absorption, enhanced separation efficiency of charge carriers as well as high specific surface area. Meanwhile, 1.25Nb-BiOBr demonstrated stability in RhB degradation, thereby facilitating the water treatment application.
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Springer Science+Business
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Introduction Water pollution has become more and more serious with the rapid growth of modern industry and population growth in recent years, which constantly retard the sustainable development [1, 2]. Wastewater contains a lot of organic pollutants. For example, Rhodamine B (RhB) is a kind of azo dyes with high biological toxicity, high chroma and high COD, Handling Editor: Maude Jimenez.
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https://doi.org/10.1007/s10853-020-05265-3
which could lead to serious environmental pollution [3]; Ofloxacin (OFX), as an antibacterial and a colorless organic pollutant, could cause the drug resistance of bacteria and food and drinking water pollution [4]. Of late, various techniques have been applied to remove the pollutants from wastewater, such as membrane separation, adsorption, biooxidation and electrolysis [5]. But these traditional techniques have many drawbacks, for instance, high
J Mater Sci
costs, long reaction time and low removal efficiency [6]. Therefore, it is an urgent demand to develop energy saving and effective renewable technologies for removing organic pollutants from wastewater. Recently, the photocatalytic technique is regarded as one of the most promising technologies and is becoming one research focus considering its low cost, eco-friendly and high efficiency [7, 8]. It is critical to design high-efficient photocatalysts to eliminate water pollution [9, 10]. Particularly, due to the unique layered structure, appropriate bandgap (2.6–2.8 eV) and high photocatalytic stability [11–13], BiOBr has attracted extensive resea
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