Pyrochlore Ce2Zr2O7 decorated over rGO: a photocatalyst that proves to be efficient towards the reduction of 4-nitrophenol and degradation of ciprofloxacin under visible light

被引:78
作者
Mansingh, Sriram [1 ]
Acharya, Rashmi [1 ]
Martha, Satyabadi [1 ]
Parida, K. M. [1 ]
机构
[1] Siksha O Anusandhan Deemed Univ, Ctr Nano Sci & Nano Technol, Bhubaneswar 751030, Odisha, India
关键词
REDUCED GRAPHENE OXIDE; P-NITROPHENOL; HYDROGEN-PRODUCTION; AQUEOUS-SOLUTION; DOPED CEO2; NANOPARTICLES; COMPOSITE; OXIDATION; NANOCOMPOSITES; GENERATION;
D O I
10.1039/c8cp00621k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In the present study, a series of Ce2Zr2O7@rGO nanocomposites were synthesized using a simple solution combustion method followed by a photoreduction technique. The as-prepared samples were well characterised using various analytical techniques to determine the morphological, optical, structural, electrochemical and compositional properties. The presence of oxygen defects was observed from Raman and photoluminescence spectra. The photoreduction of GO to rGO was determined from Raman and Fourier-transform infrared (FTIR) spectroscopy results. The role of rGO proved to be quite significant for the enhanced photocatalytic activity of the nanocomposites. The synergistic communication between Ce2Zr2O7 and rGO accelerates the photoreduction of 4-nitrophenol along with the degradation of ciprofloxacin under visible light irradiation. Of the rGO nanocomposites, 3 wt% GO loaded Ce2Zr2O7 reduces 99% of 20 ppm of 4-nitrophenol to 4-aminophenol in 120 min and decomposes 10 ppm of ciprofloxacin by up to 89% in 60 min. The significant enhancement in the activity of the Ce2Zr2O7@rGO nanocomposite was ascribed to the effective charge separation of excitons through p-conjugation of graphene at the interface, which is well supported by the impedance, photoluminescence and photocatalytic results.
引用
收藏
页码:9872 / 9885
页数:14
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