Abstract
Graphitic carbon nitride (g-C3N4) has attracted growing attention recently for photodegradation of pollutants. However, the photosensitization performance of g-C3N4 was limited by insufficient generation efficiency of reactive oxygen species (ROS) and weak light absorption. In this study, platinum (Pt)–doped g-C3N4 photocatalyst was synthesized by thermal polycondensation using dicyandiamide and chloroplatinic acid. The structure and composition of Pt-doped g-C3N4 were tested by scanning electron microscope (SEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma-mass spectrometry (ICP-MS), which indicated that the Pt-doped g-C3N4 was successfully prepared. Compared with bare g-C3N4, Pt2+-doped g-C3N4 has wider light absorption range, lower band gap, and higher photon-generated carrier migration efficiency, which significantly improved the light absorption range and photosensitization efficiency of Pt2+-doped g-C3N4, while photodegradation efficiency for Rhodamine B (RhB) increased from 50 to 90%. The effecting factors of adsorption and photocatalytic degradation performance of Pt2+-doped g-C3N4 for RhB were investigated in detail. The adsorption is a monolayer adsorption process that fits the Langmuir model, as well as being a spontaneous endothermic process. Using a white LED as an excitation source, electrons and holes in Pt2+-doped g-C3N4 were generated. The electrons reacting with dissolved oxygen produce active oxygen species such as •OH and 1O2, which can degrade RhB on the surface of Pt2+-doped g-C3N4. The photocatalytic method has the advantages of simple operation, low cost, and high efficiency, and has the potential to directly remove dyes in wastewater utilizing sunlight.
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The authors gratefully acknowledge the Sichuan Science and Technology Program (No. 19JCQN0061). The authors also thank Dr. Qili Hu of College of Ecology and Environment in Chengdu University of Technology for his generous help in explanation of adsorption mechanism.
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Qiang Chen contributed to the interpretation of the results and to the writing of the manuscript. Paijin Zhu designed and carried the experiment. Bing Wan collected the samples. Shuxia Xu and Yi Huang supervised the study. All the authors read and approved the final manuscript.
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Chen, Q., Wan, B., Zhu, P. et al. The synergy of adsorption and photosensitization of platinum-doped graphitic carbon nitride for improved removal of rhodamine B. Environ Sci Pollut Res 29, 16449–16459 (2022). https://doi.org/10.1007/s11356-021-15340-0
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DOI: https://doi.org/10.1007/s11356-021-15340-0