Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 271, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2021.118778
Keywords
gamma-Ray induced simultaneous grafting; Chelating reaction; Ion exchange; Ag(I) recovery
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Funding
- National Natural Science Foundation of China [11975152, 11675103]
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A novel sulfydryl-functionalized adsorbent PP-g-GMA@MEA for recovery of Ag(I) was synthesized by gamma-ray induced simultaneous grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) non-woven fabric, followed by ring-opening processes with mercaptoethylamine (MEA). Batch adsorption experiments were carried out to evaluate adsorption abilities of the adsorbents under high acidity, confirming its remarkable selectivity towards Ag(I).
A novel sulfydryl-functionalized adsorbent PP-g-GMA@MEA for recovery of Ag(I) was synthesized by gamma-ray induced simultaneous grafting of glycidyl methacrylate (GMA) onto polypropylene (PP) non-woven fabric, followed by ring-opening processes with mercaptoethylamine (MEA). The obtained adsorbents before and after adsorption of Ag(I) were fully characterized by SEM, EDS, FT-IR spectra, XRD and XPS. Batch adsorption experiments were carried out to evaluate adsorption abilities of the adsorbents under high acidity. The adsorption kinetics of Ag(I) were well fitted with pseudo-second-order kinetics model. The maximum adsorption capacity calculated by the Langmuir isotherm model was 262.51 mg/g at 25 degrees C. EDS, XRD and XPS analyses confirmed the mechanism of adsorption under high acidity was chelating reaction between -SH and Ag(I) and ion exchange adsorption towards [Ag(NO3)(2)](-1). Through competitive adsorption tests, the PP-g-GMA@MEA was found remarkably selective towards Ag(I) when it coexisted with Cu(II), Co(II), Ni(II) and Cr(III) in high acidity medium. Therefore, the developed PP-g-GMA@MEA composite would be a promising adsorbent for Ag(I) recovery from industrial effluents.
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