THERMODYNAMICS AND KINETICS ADSORPTION OF PHENOL RED ON CARBON-CuO NANOCOMPOSITE |

UV-Visible spectroscopy, scanning electron microscopy (SEM), and Fourier transformed infrared spectroscopy were used to produce and study the Carbon-CuO nanocomposite (FTIR). Using a UV-Visible spectrophotometer, the nanocomposite was utilised as a nanoadsorbent for the adsorption of phenol red at a wavelength of 270 nm (model 6705). The impact of several parameters such adsorbent dose, contact time, starting concentration, temperature, and pH was investigated. At the ideal conditions of adsorbent dose; 0.2, contact duration; 40 min, initial concentration; 40 mg/L, temperature; 343K (70°C), and pH; 7, carbon-CuO nanocomposite as nanoadsorbent removed 99.98 percent of phenol red. The pseudo second order kinetic, with R2 =0.979, fit the experimental data better than the pseudo first order, which had R2 =0.166. At various temperatures, the free energy values for phenol red adsorption on Carbon-CuO nanocomposite were determined to be -16998.08, -17988.224, -18978.484, -19968.744, and -20959.004 J/mole, respectively. The negative free energy values show that phenol adsorption on nanocomposite is spontaneous. The obtained values for enthalpy and entropy change were 13006.914 J/mole and 99.026 J/Kmole, respectively. Because the enthalpy value is positive, the adsorption process was endothermic. Because the entropy change obtained was positive, the adsorption was determined to have increased in randomness at the Carbon-CuO nanocomposite-phenol interface.

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