期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 357, 期 -, 页码 1-10出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2018.02.006
关键词
FeS-Fe2S3; Clinoptilolite; Nanoparticles; Heterogeneous photocalaysis; Experimental design; RSM; Ciprofloxacin
FeS and Fe2S3 semiconductors were coupled and supported onto clinoptilolite nanoparticles (CN) via sulfidizing of Fe(II) and Fe(III) exchanged CN. The composite was characterized by X-ray diffraction (XRD), scanning electron microscope-energy dispersive x-ray (SEM-EDX), transmission electron microscopy (TEM) and diffuse reflectance spectroscopy (DRS) techniques. To study of the synergistic effects of supporting and coupling, the photocatalytic activities of FeS-CN, Fe2S3-CN and FeS-Fe2S3-CN catalysts were evaluated in the photodegradation of ciprofloxacin (CIP) aqueous solution. The ratio of FeS/Fe2S3 played an important role in the photocatalytic activity of the coupled systems, so the catalyst FF1 which ion exchanged in a solution containing 0.1 mol L-1 Fe(II) and 0.15 mol L-1 Fe(III) showed the best activity in the degradation of CIP. To study the interactions of the experimental variables on the photocatalytic activity of the FeS-Fe2S3-CN catalyst, experiments were designed using response surface methodology (RSM) approach. The best results were obtained in the run with the following conditions: pH 3.7, catalyst dose of 2.8 g L-1, 3.8 mg h(-1) of CIP during 102 min irradiation of the suspension. The satisfactory correlation coefficient (R-2 = 0.9480) for the second order polynomial model, confirmed that the predicted data by RSM well agree with the experimental results. (C) 2018 Elsevier B.V. All rights reserved.
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