Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 3, Pages 3324-3329Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.11.173
Keywords
One-pot redox; Z-scheme; Photocatalytic activity; Antibiotic degradation
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Funding
- Natural Science Foundation of China [21401014, 51572126]
- Key R & D Programs of Jiangsu Province [BE2014100, BE2015103]
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center of Jiangsu Province [ACGM2016-06-11]
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A high-performance photocatalyst, attapulgite/Cu2O/Cu/g-C3N4 (ATP/Cu2O/Cu/g-C3N4), was constructed via a one-pot redox strategy under anoxic calcination. The as-prepared composites were characterized by Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), N-2 adsorption-desorption isotherms (BET), photoluminescence emission (PL), and electrochemical impedance spectra (EIS). Results indicate that ultra-fine CuO nanoparticles on the surface of rod-like attapulgite are in-situ reduced by NH3 gas to generate Cu and minority Cu2O during the pyrocondensation of melamine. Meanwhile, the generated g-C3N4 membrane is uniformly encapsulated on the surface of attapulgite/Cu2O/Cu to assemble Z-scheme Cu2O/Cu/g-C3N4 heterostructure. ATP/Cu2O/Cu/g-C3N4 shows improved visible light response ability and hole-electron suppression compared with ATP/g-C3N4. The photocatalytic performance and mechanism of the obtained photocatalyst for antibiotic degradation were evaluated by UV-Vis spectrometer and liquid chromatograph. ATP/Cu2O/Cu/g-C3N4 can exhibit favorable photocatalytic activity and reusability for chloramphenicol. In addition, h(+) and center dot OH radicals are the main active sites in the photocatalytic process, and Cu species play a vital role in separation and retarding recombination of electron-hole pairs.
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