In the present study copper oxide nanoparticles (CuNPs) were synthesized via simple and eco-friendly green route using black tea extract . Characterization of synthesized nanoparticles (NPs) was undertaken. The characteristic absorption peak of CuNPs was in range (352-355) nm in UV-Vis spectrum. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies revealed the morphological and structural character of green NPs. The particle size was 25-50 nm. Energy dispersive spectroscopy (EDX) showed high intense metallic peak of copper (Cu), oxygen (O), carbon (C) and low intense peaks of phosphorus (P) , calcium (Ca) , sulfur (S), potassium (K) elements due to the capping action of biomolecules of plant extract in CuNPs formation. The X-ray diffraction (XRD) pattern showed distinctive peaks corresponding to ( 200), ( 220) and ( 311) planes revealing the high crystalline nature of synthesized CuNPs . The dyeing behavior of green CuNPs treated fabric with Acid Black 172 (AB 172) has been studied and the build up of dye, measured as exhaustion percentage (E%). Dye adsorption rate constants according to pseudo-first order, pseudo-second order, and intra-particle diffusion kinetic models were calculated. Moreover, the dye adsorption equilibrium data were fitted well to the Freundlich isotherm rather than Langmuir isotherm. The overall adsorption process follow pseudo-second order kinetics, Intraparticle diffusion and Elovich model. The CuNPs treatment produces a nylon fabric with advanced color fastness and antibacterial properties enabling them to improve human health care and reducing temperature, the environmental impacts, fabric damage, amount of dyestuff used and saving energy of conventional dyeing of nylon fabrics. This review focuses on green synthesis of CuNPs using environmentally benign reagents in minimal time paves the way for future studies on CuNPs toxicity without risking interference from potentially toxic reagents and capping agents. The use of this technique to treat nylon fabric may lead to new coloration technique and other functional improvement.
T HE potential of the synthesized Copper Oxide (CuO)and Graphene Oxide (GO) nanostructures as an efficient modifier for cotton fabric surface, to enhance its functional properties when dyed with C.I. Reactive Yellow 160 (RY 160) was investigated. For this purpose, Copper Oxide nanoparticles (CuO NPs) and Graphene Oxide nanoparticles (GO NPs) were synthesized and characterized through SEM, and EDX analysis, TEM analysis, FTIR spectrum analysis and X-ray diffraction (XRD) analysis. The cotton fabric was first treated separately with CuO NPs and GO NPs, and then dyed with RY160. The dye exhaustion percentages (E%) of pretreated cotton fabric samples were compared with their corresponding values obtained through conventional dyeing of untreated cotton. Dye adsorption rate constants according to pseudo-first order, pseudo-second order, and intraparticle diffusion kinetic models were calculated. Moreover, the diffusion coefficients and the activation energy of diffusion of RY160 into cotton fabrics were calculated before and after NPs treatment. The activation energy of diffusion of RY160 into pretreated GO NPscotton fabric was the lowest value, saving 44.06% of the energy required for conventional dyeing completion. The overall adsorption process follows pseudo-second order kinetics and intraparticle diffusion model. The corresponding thermodynamic parameters, namely enthalpy (ͦ), entropy (), and free energy changes (), were also calculated for untreated cotton fabric and compared with the data obtained for treated cotton fabrics after surface modification via synthesized nanomaterials, CuO NPs and GO NPs. The NPs treatment produces a cotton fabric with advanced color fastness and antibacterial properties enabling them to improve human health care and decrease the environmental impacts and fabric damage.
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