Green route to Prussian blue nanoparticles with high degradation efficiency of RhB under visible light
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Green route to Prussian blue nanoparticles with high degradation efficiency of RhB under visible light Jiao Yang1, Zhi Huang1, Baodeng Yang1, Hua Lin1, Lizhao Qin1, Ming Nie1, and Qing Li1,* 1
Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, School of Materials and Energy, Southwest University, Chongqing 400715, China
Received: 5 August 2020
ABSTRACT
Accepted: 29 September 2020
Prussian blue nanoparticles (PBNPs) have been synthesized by using b-cyclodextrin (b-CD) as a surfactant and ethyl alcohol as a green solvent. The products were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectrometer (XPS) and Brunauer–Emmett–Teller (BET) to analyse the structure, morphology, surface elements, specific surface area and porosity, respectively. It was found that the specific surface area of PB120 was 90.527 m2 g-1. When the as-prepared PBNPs were applied as heterogeneous photo-Fenton catalysts, they exhibit high catalytic efficiency and stability of degrading Rhodamine B (RhB) under visible light in neutral system. The catalytic degradation of 25 mg L-1 RhB by PB-120 only needed 15 min, while the high degradation rate (83%) of RhB after 4 cycles of degradation could be achieved. The as-prepared PBNPs may be employed as excellent catalysts to degrade organic pollution.
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Shen Dillon.
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https://doi.org/10.1007/s10853-020-05406-8
J Mater Sci
GRAPHIC ABSTRACT
OH þ ! RX þ OH
Introduction Water pollution is a serious problem which is mainly caused by the discharge of untreated textile industry wastewater into water bodies. The untreated textile wastewater contains organic dyes which is difficult to degrade [1]. Therefore, it is urgent to find an effective method for degrading water pollutants. Advanced oxidation process (AOP) is a viable method for degrading organic pollutants, which have attracted increasing attention because of its simple operating conditions, relatively low cost and environmental friendliness [2]. Among these AOP methods, semiconductor materials acquire high energy by absorbing photons of suitable wavelengths, which can transfer electrons from the valence band (VB) to the conduction band (CB), causing the dye to undergo redox reactions and degradation [3]. AOP can degrade pollutants into H2O and CO2 through a green process [4]. Typically, AOP technology produces highly reactive intermediates (O2 and OH) that can oxidize almost all organic contaminants [5], which can expressed as the following equations (Eqs. 1–3, R represents an organic group): OH þ RH ! R þ H2 O
ð1Þ
R þ O2 ! RO2 ! products ðCO2 Þ
ð2Þ
ð3Þ
The easiest way to generate OH is to decompose H2O2 under light (Eq. 4). Thus, H2O2 is usually used in combination with UV [6]. UV
H2 O2 ! 2OH
ð4Þ
However, some catalysts (such as TiO2) can on
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