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Synthesis of C/g-C₃N₄ Using Polystyrene as a Carbon Source Obtained by Pickering Emulsion and Its Visible-Light
1College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, Sichuan Province, P. R. China.
Abstract:
Graphitic carbon nitride (g-C₃N₄) can be used as a photocatalytic initiator and stabilizer in the process of Pickering emulsion polymerization for polystyrene/g-C₃N₄. After carbonization, highly catalytically active carbon (C)/g-C₃N₄ is obtained. The properties of the photocatalysts are characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, thermogravimetric analysis, ultraviolet-visible spectroscopy, and electrochemical analysis. The degradation of methylene blue is investigated to determine the activity of the photocatalyst. The results suggest that polystyrene nanospheres coated with g-C₃N₄ can be obtained when the volume ratio of the g-C₃N₄ aqueous dispersion and styrene is more than 40. The obtained polystyrene/g-C₃N₄ exhibits strong interaction of matter causing by Pickering emulsion polymerization using g-C₃N₄ as the photocatalytic initiators and stabilizer. The interaction still exists in C/g-C₃N₄ when the polystyrene is carbonized, which can enhance the separation efficiency of photoelectron-hole pairs, reduce the charge transfer resistance, and accelerate the degradation of methylene blue. It is worth noting that the photocurrent density of C/g-C₃N₄ is about 68.3 times that of the original g-C₃N₄.
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