Journal of Materials Science

Minggu, 13 Mei 2018 14:20 | Sudah dibaca 953 kali

n-Type TiO₂/p-type Cu₂O nanodiode photocatalyst with different Cu₂O contents had been successfully synthesized. The nanocomposite also had been well characterized and tested for its photocatalytic activity toward reduction of 10 ppm K₂Cr₂O₇ aqueous solution under visible light illumination. It was found that 30 % Cu₂O loading in the nanocomposite had the best photocatalytic activity in detoxifying Cr(VI) without any hole scavenger agents and the solution pH adjustment. As a result, water was simultaneously oxidized by photogenerated holes to evolve oxygen. The 20 mg as-prepared TiO₂/Cu₂O nanocomposites could reduce almost 100 % of 10 ppm K₂Cr₂O₇ aqueous solution in 90min under 150 W halogen lamp illumination. From the results, it was concluded that the photocatalytic activities of p-n heterojuction of TiO₂/Cu₂O nanodiodes had proven to be an efficient photocatalyst under visible light illumination. The photocatalytic performances of TiO₂/Cu₂O nanocomposites and its photoreaction mechanism were proposed and discussed in this work.

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