Preparation of a poly(acrylic acid) based hydrogel with fast adsorption rate and high adsorption capacity for the removal of cationic dyes

Yuan, Zhenyu; Wang, Jie; Wang, Yiming; Liu, Qian; Zhong, Yujie; Wang, Yu; Li, Li; Lincoln, Stephen F.; Guo, Xuhong

doi:10.1039/c9ra03077h

Cited by 84 publications

(43 citation statements)

References 54 publications

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“…These values are comparable to other results reported in the reference literature, for CV sorption on other types of hydrogels: 49.0 mg/g (poly (acrylic acid) hydrogels) [81]; 105.2 mg/g (carrageenan/multi-walled carbon nanotube hybrid hydrogel) [82] and 16.3 mg/g (κ-carrageenan hydrogel beads) [83].…”

supporting

confidence: 90%

“…From Figure 9b and Table 5 we can see that the adsorption of CV onto the surface of the hydrogel is an exothermic process for PVA and K/PVA 1:6. For these two types of hydrogel, the adsorption is spontaneous and of a physical nature, indicated by the slightly negative values of ∆G [81], and is observed to decrease with the increase in temperature. For all hydrogels, the ∆S values are positive, indicating the increased randomness at the solid/liquid interface in the adsorption process.…”

mentioning

confidence: 95%

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Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

et al. 2020

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This paper discusses the structure morphology and the thermal and swelling behavior of physically crosslinked hydrogels, obtained from applying four successive freezing–thawing cycles to poly (vinyl alcohol) blended with various amounts of κ-carrageenan. The addition of carrageenan in a weight ratio of 0.5 determines a twofold increase in the swelling degree and the early diffusion coefficients of the hydrogels when immersed in distilled water, due to a decrease in the crystallinity of the polymer matrix. The diffusion of water into the polymer matrix could be considered as a relaxation-controlled transport (anomalous diffusion). The presence of the sulfate groups determines an increased affinity of the hydrogels towards crystal violet cationic dye. A maximum physisorption capacity of up to 121.4 mg/g for this dye was attained at equilibrium.

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confidence: 90%

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confidence: 95%

Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

et al. 2020

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“…Hydrogels are gaining significant attention of the researchers due to their application in various research fields, such as wastewater treatment, agriculture, tissue engineering, drug delivery and electroactive applications [ 1 , 2 , 3 , 4 ]. Currently, researchers have focused on the development of polysaccharide-based hydrogels due to their cost effectiveness, biodegradability and higher ability to remove pollutants as compared to synthetic polymeric hydrogels [ 5 , 6 , 7 ]. As polysaccharide, sodium carboxymethyl cellulose (CMC) is a high-molecular weight anionic polymeric material that contains numerous hydroxyl (–OH) and carboxylate (–COO – ) groups [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Kumar

Priyadarshi

Sauraj

et al. 2020

Gels

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Novel sodium carboxymethyl cellulose-g-poly (sodium acrylate)/Ferric chloride (CMC-g-PNaA/FeCl3) nanoporous hydrogel beads were prepared based on the ionic cross-linking between CMC-g-PNaA and FeCl3. The structure of CMC and CMC-g-PNaA were elucidated by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectroscopy, and the elemental composition was analyzed by energy dispersive X-ray analysis (EDX). The physicochemical properties of the CMC-g-PNaA/FeCl3 hydrogel beads were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and thermogravimetric analysis (TGA). The swelling percentage of hydrogel beads was studied at different time periods. The obtained CMC-g-PNaA/FeCl3 hydrogel beads exhibited a higher nanoporous morphology than those of CMC-g-PNaA and CMC beads. Furthermore, an AFM image of the CMC-g-PNaA/FeCl3 beads shows granule type topology. Compared to the CMC-g-PNaA (189 °C), CMC-g-PNaA/FeCl3 hydrogel beads exhibited improvement in thermal stability (199 °C). Furthermore, CMC-g-PNaA/FeCl3 hydrogel beads depicted a higher swelling percentage capacity of around 1452%, as compared to CMC-g-PNaA (1096%). Moreover, this strategy with preliminary results could be useful for the development of polysaccharide-based hybrid hydrogel beads for various potential applications.

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“…The carboxyl group content of the gel samples at equilibrium state was determined by back titration. [ 39 ] ≈50 mg gel samples were first immersed into 200 mL 10 × 10 −3 m NaOH solution and stirred for 2 d to convert carboxylic acid to sodium salt form. After complete reaction, the consumption of NaOH was measured by titration with 5 × 10 −3 m HCl standard solution.…”

Section: Methodsmentioning

confidence: 99%

Micelle Crosslinked Polyacrylic Acid Hydrogels with Resilience and Self‐Recovery Properties

Gulyuz

2020

Macro Materials & Eng

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Micelle crosslinking method is one of the several techniques to fabricate hydrogels with good mechanical performance. Micelle crosslinked hydrogels reported so far are fabricated using a multistep preparation process due to the functionalization of block copolymers or surfactants with acrylate, aldehyde, azo, or reversible addition‐fragmentation chain transfer groups to create a polymer network. Herein, a simple one‐step approach is introduced to produce resilient hydrogels prepared by bulk polymerization of acrylic acid and esterification with Triton X‐100 (TX‐100) in the presence of catalyst sulfuric acid (H2SO4). The advantage of this study is that TX‐100 surfactants self‐assembling into micelles are directly bonded onto polymer chains through an ester bond without any further modification. The obtained hydrogels exhibit tensile strengths up to 135 ± 8 kPa and compressive strengths up to 16 ± 1 MPa over 94% strains as well as complete self‐recovery and high resilience abilities (≈86% at strains up to 400%) originating from hydrophobic associations in the core of micelles acting as dynamic cross‐linkers along with hydrogen bonds and entanglements between polymer chains acting as additional crosslink points. The overall results show that the hydrogels can be good candidate as elastic materials in many fields.

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Preparation of a poly(acrylic acid) based hydrogel with fast adsorption rate and high adsorption capacity for the removal of cationic dyes

Abstract: A biocompatible Dex-MA/PAA hydrogel was prepared through copolymerization of glycidyl methacrylate substituted dextran (Dex-MA) with acrylic acid (AA), which was applied as the adsorbent to remove cationic dyes from aqueous solutions.

Cited by 84 publications

References 54 publications

Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

Nanoporous Sodium Carboxymethyl Cellulose-g-poly (Sodium Acrylate)/FeCl3 Hydrogel Beads: Synthesis and Characterization

Micelle Crosslinked Polyacrylic Acid Hydrogels with Resilience and Self‐Recovery Properties

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