Aluminium hydroxide impregnated macroreticular aromatic polymeric resin as a sustainable option for defluoridation. Issue 2 (June 2015)

• Record Type: Journal Article
• Authors: Barathi, M.; Kumar, A. Santhana Krishna; Rajesh, N.
• Is Part Of: Journal of environmental chemical engineering. Volume 3:Issue 2(2015:Jun.)
• Page Start: 630
• Page End: 641
• Publication Date: 2015-06
• Subjects: Macroreticular resin -- Aluminium hydroxide -- Fluoride removal -- Adsorption; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2015.02.009
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Aluminium hydroxide impregnated macroporous polymeric adsorbent was prepared. Characterization of the adsorbent was studied in detail. The sorbent has a maximum F − ion adsorption capacity of 36.61 mg g −1 at pH 7.0. F − ion adsorption favoured by electrostatic interaction and hydrogen bonding. Adsorbent is effectively regenerated with sodium hydroxide. Abstract: The purpose of the present study was to explore the potential application of aluminium hydroxide impregnated macroporous polymeric resin as a sustainable option for fluoride removal from aqueous solution. Electrostatic interaction between fluoride and the cationic metal hydroxide as well as hydrogen bonding (metal-OH⋯F) could be inferred through Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques. This macroreticular adsorbent gave a high adsorption capacity (92.39 and 36.61 mg g −1 at pH 3.0 and 7.0) by fitting the experimental data with the nonlinear Langmuir isotherm model. The pseudo-second-order adsorption process could be described using surface and intraparticle diffusion. Thermodynamics of adsorption accounted for the spontaneity and exothermic interaction with a corresponding decrease in entropy. The Al(OH)3 impregnated polymeric resin adsorbent was tested with 5 mg L −1 fluoride and its efficacy was demonstrated in a laboratory scale column study. The resin exhibits good potential towards practical applications for the remediation of fluoride.