Synthesis of poly(acrylamide-co-itaconic acid)/MWCNTs superabsorbent hydrogel nanocomposite by ultrasound-assisted technique: Swelling behavior and Pb (II) adsorption capacity

Abstract

In this research, the poly (acrylamide-co-itaconic acid)/multi-walled carbon nanotubes (P(AAm-co-IA)/MWCNTs) as a novel superabsorbent hydrogel nanocomposite was synthesized by graft copolymerization of acrylamide (AAm) and itaconic acid (IA) mixture in the presence of the MWCNTs using ammonium persulfate (APS) as a free radical initiator and methylenebisacrylamide (MBA) as a crosslinker under ultrasound-assisted condition. The blank P(AAm-co-IA) hydrogel and its composite with the MWCNTs were characterized by means of SEM, FTIR, XRD and TGA methods. The effects of different parameters such as pH, time, the MWCNTs content and salt solutions on swelling behavior were investigated. The stability of the hydrogel increased by any increase in the MWCNTs content, which might be attributed to the hydrophobic nature of the MWCNTs as well as the increase of the crosslinker density. The water retention capacity (WRC) of the P(AAm-co-IA) hydrogel increased in the presence of the MWCNT (10 wt%). The synthesized hydrogel nanocomposite was studied for Pb (II) adsorption from aqueous solution. The effects of different parameters such as contact time (5-90 min), Pb (II) initial concentration (25-175 mg/L) and initial pH (1.5-4.5) of solution on Pb (II) adsorption were investigated by batch method. In comparison to P(AAm-co-IA) hydrogel, the P(AAm-co-IA)/MWCNTs hydrogel nanocompoite showed better adsorption behavior toward Pb (II). One of the most important aspects of this research was to investigate the effects of ultrasonic waves on polymer matrix and its ability.

MWCNT induced negative real permittivity in a copolyester of Bisphenol-A with terephthalic and isophthalic acids

“…In figure 3(a), the peaks at about 2θ=20°and 45°attributed to the pure PAr [20] which were still detected for PAr/MWCNT composites (figures 3(b) and (c)), suggesting the structure of PAr was well retained during the melt mixing and compression molding processes of PAr with MWCNT. The characteristic sharp peak observed at 2θ=25.2°(figure 3(c)) confirms the presence of MWCNTs in the composites [21][22][23][24].…”

Removal of Methylene Blue from Aqueous Solution By Polydopamine@Zeolitic Imidazolate-67

“…Study of the adsorption kinetics is very important to predict the adsorption mechanisms that control the pollutants removal and the retention time of adsorbed species. The adsorption kinetics can be explored by some kinetic models such as pseudo-first-order (PFO) [30], pseudo-secondorder (PSO) [30], and intra-particle kinetics [20].…”

“…Rapid growth of chemical industries along with the expansion of agriculture has led to severe pollution of water resources [30]. This topic is considered as a global problem [11].…”

“…Adsorption on the surface of a suitable adsorbent is another common method for removal of different contaminants. Carbon materials [23,30], minerals (including kaolinite and montmorillonite) [18], polymers [10] zeolites [37], clays [8], sludge [5], flax fibers [40], and Biochar [33], are some of the most widely used adsorbents in this regard.…”

Hyaluronic Acid Methacrylate Hydrogel-Modified Electrochemical Device for Adsorptive Removal of Lead(II)

“…Among all these approaches, adsorption has proved to be the most practical method due to its simplicity of design and operation, high efficiency, and economical advantage [ 18 , 19 , 20 ]. Different kinds of polymer materials, such as poly(pyrrole methane) [ 21 ], poly(allylamine-co-methacrylamide-co-acrylic acid) [ 22 ], poly( N , N -dimethylacrylamide-co-2-hydroxyethyl methacrylate) [ 23 ], poly(acrylamide-co-itaconic acid) [ 24 ], melamine-formaldehyde-diaminohexane [ 25 ], poly( trans -aconitic acid/2-hydroxyethyl acrylate) [ 26 ], polyisoprene- b -polystyrene- b -poly( N , N -dimethylacrylamide) [ 27 ], nanochitosan/polyurethane/polypropylene glycol [ 28 ], etc., have been functionalized or directly utilized as effective adsorbents. Hyaluronic acid (HA), a carbohydrate polymer with repeated disaccharide units of glucuronic acid and N-acetylglucosamine alternatively linked by β-1,3 and β-1,4 glycosidic bonds, is widely present inside the human body (e.g., muscular connective tissues, epithelial tissues, and extracellular matrices).…”