Visible-light-driven and ultrasonic-assisted copper metal-organic frameworks and graphene oxide nanocomposite for decolorization of dyes

The crystalline and nano-sized {[Cu(tipe)(H2O)](2,2′-bpdc)·11H2O·DMF}n (1·11H2O·DMF or Cu-tipe) (tipe ​= ​1,1,2,2-tetrakis (imidazole-1-yl)phenyl)ethylene, 2,2′-bpdc ​= ​2,2′-biphenyldicarboxylate) were synthesized and structural analysis by X-ray diffraction, scanning electron microscopy, optical band gaps, photoluminescence and thermal stability. Cu-tipe and graphene oxide (GO) nanocomposite (Cu-tipe/GO) was synthesized with sonochemical method and characterized. Cu-tipe exhibits a (4,4)-coordinated 2D network showing the point symbol {44·62}{44·62}. The photocatalytic and sonocatalytic decolorization of methylene blue (MB), methyl violet (MV), rhodamine B (RhB) under visible light and ultrasound irradiation showed that the catalytic efficiencies of decolorization organic dyes for Cu-tipe/GO composite are higher than these of most of MOF and MOF composite. Crystalline and nano-sized Cu-tipe also showed high decolization efficiencies. The radicals trapping experiments were carried out to study the active species and the degradation mechanism was proposed. The crystalline solid and nano-sized Cu-tipe and Cu-tipe/GO composite were synthesized and characterized. The crystalline and nano-sized Cu-tipe and Cu-tipe/GO composite are good and high effective catalysts for degradation of organic dyes under ultrasound and visible light irradiation. The catalytic mechanism was proposed. [Display omitted] •The crystalline solid and nano-sized Cu-tipe and Cu-tipe/GO composite were synthesized and characterized.•Cu-tipe exhibits a (4,4)-coordinated 2D network showing the point symbol {44·62}{44·62}.•The degradation of MB, MV and RhB under ultrasound and visible light irradiation.•The good and high efficiency sono- and photo-catalysts for degradation of organic dyes.•The catalytic mechanism was proposed.