NPAM-assisted rapid synthesis of BiOBr ultrathin hierarchical clusters for efficient photocatalytic degradation of RhB a
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Bull Mater Sci (2020) 43:255 https://doi.org/10.1007/s12034-020-02224-1
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NPAM-assisted rapid synthesis of BiOBr ultrathin hierarchical clusters for efficient photocatalytic degradation of RhB and ciprofloxacin FANGFANG DUO1,*, MINGLIANG ZHANG2, LIANGLIANG CHU1, CHUBEI WANG1 and JIANWEI ZHOU1 1
Institute of Energy and Fuel, Xinxiang University, Xinxiang 453003, People’s Republic of China College of Chemistry and Chemical Engineering, Xinxiang University, Xinxiang 453003, People’s Republic of China *Author for correspondence ([email protected]) 2
MS received 9 January 2020; accepted 28 March 2020 Abstract. Nonionic polyacrylamide (NPAM) bismuth bromoxide (BiOBr) ultrathin hierarchical clusters have been prepared by a rapid solvothermal synthesis route. The formation mechanism of the NPAM-BiOBr ultrathin hierarchical clusters was based on the strong bridging role of NPAM between the bismuthyl nitrate (BiONO3) particles and subsequently results in tight junctions between BiOBr nanosheets. The structure, morphology and optical properties of the prepared samples were characterized by X-ray diffraction, Raman spectra, scanning electron microscopy, diffuse reflectance spectroscopy and photoluminescence. The photocatalytic performance of NPAM-BiOBr was evaluated by the degradation of Rhodamine B (RhB) and ciprofloxacin. The photocatalytic efficiency increased by 2.1 and 2.5 times of NPAM-BiOBr for RhB and ciprofloxacin decomposition, respectively. The enhanced photocatalytic activity of NPAM-BiOBr was attributed to the increased light absorption capacity and lower recombination rate of the photo-generated electron and hole pairs. Keywords. lamide.
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Photocatalysis; BiOBr; ultrathin hierarchical cluster; Rhodamine B; ciprofloxacin; nonionic polyacry-
Introduction
In recent years, with the increasingly serious environmental pollution and energy shortage, photocatalytic technology has received enormous attention owing to its efficiency, no secondary pollution and renewable and sustainable solar energy as light source [1–3]. In order to make use of solar energy resources more efficiently and maximize the quantum conversion efficiency of photocatalysts, researchers have been pursuing the goal of synthesizing efficient photocatalysts with visible light response. The characteristics required for an ideal photocatalyst include: (1) narrower band gap to absorb as much visible light as possible and lower reflection and scattering of incident light by the photocatalyst; (2) higher photo-generated electron–hole pairs, that is, lower phonon and thermal radiation yield; (3) suitable energy band structure, so that the generated photogenerated carriers have sufficient oxidizing and reducing capacity and (4) photo-generated carriers have high separation and migration efficiency and only the successfully separated photo-generated carriers can realize the oxidation/ reduction process of substrates on the surface of the photocatalyst [4–6]. Therefore, it has been a research purpos
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