Removal of Cu(II) ions from aqueous streams using poly(acrylic acid-co-acrylamide) hydrogels

详细信息    查看全文

• 作者：Eulogio Orozco-Guare&#xf1 ; o ; Fern ; a Santiago-Gutié ; rrez ; José ; Luis Morá ; n-Quiroz ; Saira L. Hern ; ez-Olmos ; Victor Soto ; Wencel de la Cruz ; Ricardo Manrí ; quez ; Sergio Gomez-Salazar
• 关键词：Adsorption ; Swelling ; Hydrogels ; XPS
• 刊名：Journal of Colloid and Interface Science
• 出版年：2010
• 出版时间：15 September 2010
• 年：2010
• 卷：349
• 期：2
• 页码：583-593
• 全文大小：762 K

文摘

The adsorption of Cu(II) ions from aqueous solutions onto poly(acrylic acid-co-acrylamide) hydrogels was investigated. The hydrogels were prepared via free-radical solution polymerization using Irgacure 754 as a photoinitiator and ethylene glycol dimethacrylate as a cross-linking agent. Loading of acrylamide/acrylic acid moieties on the surfaces of hydrogels and the amount of cross-linking agent were varied to determine the maximum metal uptake. Polymerization kinetics was investigated by ¹H NMR. The physicochemical properties of hydrogels were investigated by nitrogen sorption measurements, elemental analysis, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The ¹H NMR results demonstrated that the polymerization reaction was carried out almost to completion and confirmed the absence of residual monomers. Swelling results indicated that, by appropriate selection of cross-linking agent amount and monomer ratio, hydrogels can be swollen up to 70,000 % . Further characterization of the hydrogels showed rapid adsorption kinetics and equilibrium Cu(II) adsorption capacities of 121 mg g⁻¹. Cu(II) adsorption kinetic data followed pseudo-first-order kinetics. Adsorption equilibrium data were better fitted by a Langmuir isotherm. FTIR and XPS results indicated the presence of a tetradentate copper complex on the surfaces of hydrogels. The copper uptake achieved suggests the potential use of hydrogels to extract toxic metals from industrial aqueous streams.