Abstract
The aim of this work is to evaluate the adsorption performance of a carboxylate-functionalized graft copolymer of TiO2-densified cellulose (PGTDC-COOH) for copper ions removal from aqueous solutions and industrial effluents. The chemical modification was confirmed by infrared spectroscopy and X-ray diffraction. The adsorption experiments were conducted in a batch adsorption technique. The influence of different experimental parameters such as pH, contact time, adsorbent dose, and Cu(II) concentration was investigated. The optimum pH for Cu(II) adsorption was observed at pH 5.0 and the equilibrium was reached in 1 h. Kinetic data was analyzed using pseudo-first-order and pseudo-second-order equations and showed better fit with pseudo-second-order equation. The equilibrium isotherm data correspond to the Langmuir model. The maximum binding capacity, Q 0 was found to be 75.82 mg L−1 with binding constant, b = 0.036 L mg−1 at 30°C and pH 5.0. Utility of the adsorbent was tested by removing Cu(II) from electroplating industry wastewater. The adsorbed Cu(II) ions were desorbed effectively by 0.1 M HCl solution. The results illustrate that PGTDC-COOH can be effectively used for the removal of copper ions from aqueous solutions.
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