Synthesis of superabsorbent hydrogel and manganese dioxide nanowires composite for adsorption of Pb(II) from aqueous solution

Abstract

The superabsorbent composite was prepared by aqueous solution polymerization, using manganese dioxide, acrylic acid, acrylic amide, 2-acrylamide-2-methyl-1-propanesulfonic acid as raw materials, N,N 0 -methylene bisacrylamide as cross-linker, and K 2 S 2 O 8 as initiator. The composite was characterized by Fourier transform infrared spectrophotometer, thermogravimetric analysis and scanning electron microscopy analysis. This article also described the adsorption behavior of the superabsorbent composite with respect to Pb(II) removal from aqueous solution. The kinetic studies for Pb(II) adsorption showed that the pseudo-secondorder adsorption mechanism was predominant. Moreover, adsorption isotherm data were reliably described by the Freundlich model. Regeneration of the adsorbent was attained by 0

Construction of a novel double network polymer composite and evaluation of its highly efficient adsorption properties for copper ions

“…Therefore, efficient adsorbents become the decisive factor in the adsorption process of heavy metals ions, and the researches on exploring the novel adsorbents with high efficiency for heavy metals adsorption become very essential 4–15 . The development of double network polymer adsorbents for heavy metals adsorption, generally which are prepared by using poly‐blending two kinds of polymer precursor, is highly desirable and is a main challenge in recent years 16–18 . For instance, Zhao et al 19 developed α‐ketoglutaric acid modified chitosan/polyacrylamide semi‐interpenetrating polymer network hydrogen for heavy metals adsorption.…”

“…[4][5][6][7][8][9][10][11][12][13][14][15] The development of double network polymer adsorbents for heavy metals adsorption, generally which are prepared by using poly-blending two kinds of polymer precursor, is highly desirable and is a main challenge in recent years. [16][17][18] For instance, Zhao et al 19 developed α-ketoglutaric acid modified chitosan/polyacrylamide semiinterpenetrating polymer network hydrogen for heavy metals adsorption. Azad et al 20 prepared PVB-PVA/Sε-MnO 2 nanocomposite which was used for heavy metals adsorption from aqueous solutions.…”

Layer‐by‐layer assembly of polymeric complexes: Effect of storing time on the complexes and film structure

“…Cametti and co‐workers reported that the complexes formed between cationic liposome and polyelectrolyte complexes (PECs) had the tendency to grow into larger aggregates over time due to thermodynamic instability of the initial complexes. Eishun Tsuchida et al also reported that fibrous structures could form through inter‐complex aggregation following intra‐complex reformation of the initial complexes . Therefore, it's meaningful to investigate the time dependency of both polymeric complexes and the corresponding LbL assembled films.…”