Development of Hydrogen-Substituted Graphydine Coated Cu₂O Nanostructure as an Efficient Photocatalyst for Dye Removal.

抄録

Photocatalytic dye degradation is an attractive method for “green” environmental remediation. The Cu₂O is a natural p-type semiconductor and the most promising photocathode for solar energy harvesting and conversion. However, the Cu₂O-based photocathodes still suffer severe self-photo-corrosion and fast surface electron-hole recombination issues. Earlier reports state that the carbon coating over the Cu₂O structure effectively suppresses the photo-corrosion and recombination [1,2]. Herein, a new hydrogen-substituted graphdiyne (HsGDY) is grown over the Cu₂O nanowire to protect it from photo corrosion. The HsGDY is grown by a Glaser coupling reaction for 1, 3, 6, 9 and 12 hours. In all the experiments 10 mM MB dye and 5 ml volume are fixed. The effect of dye degradation is monitored using a UV-visible spectrometer. Fig.1(a) shows the Raman spectrum of HsGDY@Cu₂O, which contains three peaks at 2215 cm^-1 1933 cm^-1 and 1578 cm^-1 corresponding to CºC bond, Cu-metallated CºC bond and C=C bond, respectively [3]. The combined HsGDY@Cu₂O heterostructure is used for photocatalytic degradation of methylene blue (MB) dye (Fig.1(b)) under 1 sun illumination. Over time, the intensity of MB dye at 664 nm decreases with continuous illumination. Around 60 % dye was degraded at 90 minutes of illumination.

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