Adsorption of fluoride from aqueous solutions by polyacrylic acid modified with aluminium
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A novel and efficient PAA-Al-250 adsorbent was successfully synthesized and used for fluoride removal. PAA-Al-250 was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, N2 adsorption–desorption surface area and pore size analyzer. PAA-Al-250 had good fluoride adsorption capability. The optimum pH was 2.0 and more than 90% fluoride removal was achieved from 10 mg L−1 aqueous solution after 5 h at room temperature. Fluoride adsorption on PAA-Al-250 followed the Freundlich model and the maximum adsorption capacity of the adsorbent was 283.48 mg g−1. Kinetic study indicated that the adsorption followed pseudo-second-order model.
KeywordsAcrylic composite resin Fluoride Modification Adsorption isotherm Kinetics
This work was supported by Foundation of Henan Scientific and Technological Committee (No. 162300410270) and Foundation of Jiaozuo Scientific and Technological Bureau (No. 2014400038).
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