4.6 Article

Enhanced photo-induced charge separation and solar-driven photocatalytic activity of g-C3N4 decorated by SO42-

Journal

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 40, Issue -, Pages 508-515

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2015.06.025

Keywords

g-C3N4; Sulfating; Photo-generated charge separation; Photocatalytic performance

Funding

  1. program of Science and Technology Department of Sichuan province [2015JY0081]
  2. Students Innovation Project of Sichuan Province [201410622003]
  3. Research Fund Projects of Sichuan University of Science and Engineering [2013PY03]
  4. Project of Zigong city [2014HX14]
  5. Construct Program of the Discipline in Sichuan University of Science and Engineering
  6. Opening Project of Key Laboratory of Green Catalysis of Sichuan Institutes of High Education [LZJ1302]

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SO42- decorated g-C3N4 with enhanced photocatalytic performance was prepared by a facile pore impregnating method using (NH4)(2)S2O8 solution. The photocatalysts were characterized by the Brunauer-Emmett-Teller (BET) method, X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), Fourier-transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS) and surface photovoltage (SPV) specttoscopy, respectively. The separation efficiency of photo-generated charge was investigated using benzoquinone as scavenger. The results demonstrate that sulfating of g-C3N4 increases the adsorption of rhodamine B on g-C3N4, the hydroxyl content and the separation efficiency of photogenerated charge. The photocatalytic activity of SO42-/g-C3N4 for decolorization of rhodamine B and methyl orange (MO) aqueous solution was evaluated. The result shows that loading of 6.0 wt% SO42- results in the best photocatalytic activity under simulated solar irradiation and SO42- play an important role in boosting the photocatalytic activity. (C) 2015 Elsevier Ltd. All rights reserved.

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