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      Articles written in Bulletin of Materials Science

    • A facile synthesis of g-C$_3$N$_4$/BaTiO$_3$ photocatalyst with enhanced activity for degradation of methylene blue under visible light

      VAN KIM NGUYEN VIET NGA NGUYEN THI HUU HA TRAN THU PHUONG TRAN THI THANH TAM TRUONG VIEN VO

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      g-C$_3$N$_4$/BaTiO$_3$ composite was hydrothermally synthesized at 200$^{\circ}$C for 24 h from a dispersed mixture of g-C$_3$N$_4$ and BaTiO$_3$ in water, in which BaTiO$_3$ was hydrothermally synthesized at 200$^{\circ}$C for 48 h using barium nitrate, isopropanol, titanium tetrachloride and sodium hydroxide as precursors without assistance of any surfactant; and graphitic carbon nitride (g-C$_3$N$_4$) was prepared by pyrolysis of melamine at 520$^{\circ}$C. The obtained materials were characterized by X-ray diffraction, infrared spectra, scanning electron microscopy, elemental mapping, X-ray photoelectron spectroscopy and ultraviolet–visible diffuse reflectance spectroscopy. The photocatalytic activity of the materials was assessed bydegradation of methylene blue (MB) under visible light. The enhancement of photocatalytic activity of the g-C$_3$N$_4$/BaTiO$_3$ composite compared to the single components, g-C$_3$N$_4$ and BaTiO$_3$ was observed, which is attributed to the reduction of combination rate of photogenerated electron–hole pairs in the composite. The MB degradation over the composite was mainly attributed to the photoreduction process induced by the superoxide radical anions (${}^{\bullet}$O$_2^-$) and hydroxyl radicals (${}^{\bullet}$OH); and a mechanism was also proposed based on the heterojunction model from the two semiconductor components.

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