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A blended polymer adsorbent prepared using acrylic acid and polyvinylidene fluoride was used to remove copper from aqueous solutions. The polymer was prepared using thermally induced polymerization and phase inversion. The blended polymer was characterized by X-ray diffraction analysis (XRD), environ- mental scanning electron microscopy (ESEM), X-ray photoelectron spectroscopy (XPS), and N2 adsorp- tion/desorption experiments. The sorption data was fit to linearized adsorption isotherms of the Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherms models. The batch sorption kinetics was evaluated using pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic reaction models. △H 0 is greater than 0,△G0 is lower than 0, and △S0 is greater than 0, which shows that the adsorption of Cu (Ⅱ) by the blended polymer is a spontaneous, endothermic process. The adsorption isotherm fits better to the Freundlich isotherm model and the pseudo-second-order kinetics model gives a better fit to the batch sorp- tion kinetics. The adsorption mechanism is assumed to be ion exchange between the cupric ion and the carboxylic acid functional group of the blended polymer.
The blended polymer was characterized using X-ray diffraction analysis (XRD), environ-mental. The blended polymer was characterized using X-ray diffraction analysis scanning electron microscopy (ESEM), X-ray photoelectron spectroscopy (XPS), and N2 adsorption / desorption experiments. The sorption data was fit to linearized adsorption isotherm of the Langmuir, Freundlich, and Dubinin- Radushkevich (DR) isotherms models. The batch sorption kinetics was evaluated using a pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetic reaction models. ΔH 0 is greater than 0, ΔG0 is lower than 0, and ΔS0 is greater than 0, which shows that the adsorption of Cu (II) by the blended polymer is a spontaneous, endothermic process. The adsorption isotherm fits better to the Freundlich isotherm model and the pseudo-second-order kinetics model gives a better fit to the batch sorp tion kinetics. The adsorption mechanism is assumed to be ion exchange between the cupric ion and the carboxylic acid functional group of the blended polymer.