چكيده به لاتين
In this study, ZnO / CuO nanocomposite was produced by combustion using leaf extract of chickpea as a natural fuel to provide high performance adsorbent for removal of anionic dye from aqueous solution. The experiments were designed, using Taguchi's statistical design, to determine the optimal sample as the best sample in terms of maximum adsorption capacity. Effective parameters including weight ratio of copper oxide and zinc oxide, amount of fuel and type of main fuel were investigated at two levels. Optimal nanocomposite properties were identified and determined using Fourier Transform Spectroscopy (FT-IR), X-ray diffraction (XRD), field emission electron microscopy (FE-SEM) and X-ray energy dispersive spectroscopy (EDX). Effective surface adsorption parameters, such as initial pH in the range (2- 12), initial dye concentration (10–80 mg / L), adsorbent content (0.01–0.004 gr), temperature (20-45 ° C) and Call time (360 minutes) are tested. The adsorption capacity of the monolayer was optimized at pH 3, initial concentration of 40 mg / L dye solution, 0.015 gr adsorbent, 25 ° C and 360 min contact time at 253.55 mg / g. In addition, the results showed that the adsorption equilibrium data are in better agreement with the Langmuir isotherm model and the maximum adsorption capacity of Congo red monolayer on the optimum adsorbent was obtained using Langmuir isotherm model, 353/147 mg / g. The Congo red dye adsorption process on the optimum nanocomposite from the intramolecular diffusion equation in the first half hour of reaction (first step) and the pseudo-second-order kinetic model at subsequent times (second step) fitted better with the experimental data. Thermodynamic studies also showed that the adsorption process is a spontaneous and exothermic process. In general, according to the results, the naturally synthesized CuO / ZnO nanocomposite can be used as a promising adsorbent to remove this dye.
Keywords: Green Synthesis, Combustion Synthesis, Nanocomposite, Adsorption, Congo Red
