Efficient removal of toxic phosphate anions from aqueous environment using pectin based quaternary amino anion exchanger

Abstract

Pectin based quaternary amino anion exchanger (Pc-QAE) was prepared using simple crosslinking polymerization method. This anion exchanger was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Pc-QAE was applied for the removal of phosphate anion from the aqueous solution. The adsorption process which was pH dependent showed maximum adsorption of phosphate anions at pH 7. Pc-QAE showed good monolayer adsorption capacity for phosphate anions which demonstrated its good capability towards Langmuir isotherm model. Moreover, the adsorption was evaluated thermodynamically and the negative value of Gibbs free energy (-1.791KJ/mol) revealed the spontaneity of adsorption process. The value of ΔH° and ΔS° were found to be 15.28 and 49.48KJ/mol, respectively representing the endothermic nature and enhancement in degree of freedom due to the adsorption process.

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“…Naushad et al synthesized pectin based anion exchanger material to remove phosphate anions from aqueous solution (Naushad et al, 2018). At 55 o C, the maximum phosphate uptakewas75 %.…”

“…The occurrence of little intensity peaks indicated semi-crystalline behavior of pectin based quaternary amino anion exchanger (Pc-QAE) material (Figure 15). Figure 16 present the SEM morphology of pectin based quaternary amino anion exchanger (Pc-QAE) material at different magnifying scales which showed the irregular and rough morphology of the fabricated pectin based quaternary amino anion exchange material (Naushad et al, 2018).…”