Effective adsorptive removal of azodyes on synthesized copper oxide nanoparticles

Abstract

Copper oxide nanoparticles were synthesized by using Camellia Sinensis leaves extract as a reducing and capping agent of the copper ions in solutions and its azodyes adsorptive efficiency were studied. The produced copper oxide nanoparticles were subsequently characterized by SEM, TEM, XRD, FTIR, and UV spectrophotometer for investigating its particle shape, size, crystalline phase and chemical composition. The particle size of the prepared copper oxide nanoparticle was calculated from the XRD data by using the Scherrer equation was found 17.26 nm. However, the median particle size calculated from the SEM and TEM image analysis was found 25~85 nm of tetragonal particle shape. UV spectrum was obtained with maximum absorption peak at 280 nm. The FTIR spectrum indicated-OH,-C=C-and-C-H functional groups, which is due to the presence of the stabilized layer of the Camellia Sinensis leaf extract which is binded with the prepared copper oxide nanoparticles. The produced copper oxide nanoparticles were used for studying the degradation of Congo red and Malachite green azodies. Different parameters were studied to optimize the reaction conditions. Kinetic models of Langmuir, Freundlich and Elovich models were also applied. The degradation percent of the investigated azodyes on the surface of the produced copper oxide nanoparticles in aqueous solutions was observed between 70-75%.