Adsorption of Aluminum Ion from Water on Alginate-Modified Polyurethane

概要

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A dual purpose absorbent Alginate-modified polyurethane (APU) was prepared for removal of residual aluminum ion by adsorption from treated wastewater. The structure of APU was confirmed by Fourier transform infrared (FT-IR) spectroscopy and proton nuclear magnetic resonance (1H-NMR) spectroscopy. Physical characterization was preformed according to the BET method. Surface analysis using SEM/EDS revealed that on average 0.57% aluminum by weight was adsorbed on APU. The adsorption isotherm of aluminum for APU was fitted well to Freundlich model. The analysis kinetic data suggests that adsorption of aluminum follows pseudo-first-order kinetics. The adsorption of aluminum on APU increased slightly from 25 to 35°C, indicating endothermic adsorption. The activation energy of adsorption, 8.16 kJ/mol, characterizes the dominant chemiosorption nature of this adsorption. The optimum pH for aluminum adsorption on APU (applied pH: 3-8) was found to be within the pH range of wastewater effluent. The adsorption capacity of APU for aluminum using real wastewater effluent was 3.8 mg Al/g, demonstrates the feasibility of application of APU in treatment of water of complex composition.