In situ synthesis of N-CoMe2Pc/rGO nanocomposite with enhanced photocatalytic activity and stability in Cr(VI) reduction.

摘要: Graphene-based composites are widely used in the photocatalytic treatment of heavy-metal ions or dyes. In this study, we developed a facile situ precipitation method for preparing non-peripheral octamethyl-substituted cobalt(II)phthalocyanine (N–CoMe2Pc)/reduced graphene oxide (rGO) nanocomposite as an efficient photocatalyst. The physical and chemical properties were investigated by scanning electron microscopy, transmission x-ray diffraction, ultraviolet-visible, ultraviolet photoelectron, Fourier-transform infrared, Raman, photoelectron spectroscopies. results showed that N–CoMe2Pc nanoparticles immobilized on rGO nanosheets via π–π stacking interactions. activity reduction hexavalent chromium [Cr(VI), 10 mg/l] under visible-light irradiation was investigated. Cr(VI) removal ratio reached 99.5% with high rate 0.0359 min−1, which is ten times faster than achieved pristine N–CoMe2Pc. efficiency attributed to following: (1) number active sites provided nanodot-like larger bulk Pc, can increase production photogenerated carriers, (2) enhanced charge carrier separation resulting from intimate contact between nanodots GO nanosheets. N–CoMe2Pc/rGO also excellent stability reusability. 93.2% after eight test cycles.