Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 478, Issue -, Pages 263-270Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2016.05.053
Keywords
g-C3N4 nanosheets; Titania nanosheets; 2D-2D heterojunction; Z-scheme photocatalyst
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Funding
- National Natural Science Foundation of China [21305127]
- Natural Science Foundation of Zhejiang Province [LY13B040004]
- ZSTU
- National Undergraduate Training Program for Innovation and Entrepreneurship [201510338021]
- open foundation of key laboratory for preparation and application of ordered structural materials of Guangdong Province [KLPAOSM201508]
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A direct solid state Z-scheme photocatalytic system was fabricated by assembling two-dimensional (2D) g-C3N4 nanosheets (CNNS) and titania nanosheets (TNS), which were obtained from the delamination of their corresponding layered precursors. By introducing TNS, the interlayer restacking of CNNS was effectively prohibited, forming uniform CNNS/TNS composites. The tightly contacted CNNS/TNS interface promoted the charge transfer and therefore improved the separation ratio of photogenerated electron-hole pairs. The photocatalytic performance of CNNS/TNS in various mass ratios was investigated for dye degradation, and the degradation rate of optimal sample 0.7CNNS/0.3TNS was 2.34 and 48.5 times higher than those of proton flocculated pure CNNS and TNS, respectively. Superoxide radicals and hydroxyl radicals were determined as the main active species by the quenching experiment. Moreover, the enhanced generation of superoxide radicals and hydroxyl radicals was confirmed by the absorption spectra of nitroblue tetrazolium and the photoluminescence spectra of 2-hydroxy terephthalic acid, respectively. Finally, we proposed a possible Z-scheme mechanism based on the theoretical calculation and the experimental results. (C) 2016 Elsevier Inc. All rights reserved.
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