Synthesis and properties of sodium alginate/poly(acrylic acid) double-network superabsorbent

Wu, Jie; Zhou, Yanmei; Yang, Meng; Zhang, Jiaxing; Liu, Qingbing; Cao, Qimeng; Yu, Yueqin

doi:10.1515/epoly-2015-0060

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…The first layer of the crosslinked network is formed by polymerization, while carboxymethyl cellulose is used as the second layer of the crosslinked network by hydrogen bonding and Van der Waals interactions [29,30]. Figure 1 shows the proposed schematic diagram of the fabrication process of the CMC/P (NIPAM-co-AA) hydrogel [31]. The first network was the formation of the integration of NIPAM and AA, with APS as an initiator; BIS is a cross-linker (a).…”

Section: Characterization Of Ftir and Tga For Gelmentioning

confidence: 99%

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

et al. 2020

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In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.

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Section: Characterization Of Ftir and Tga For Gelmentioning

confidence: 99%

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

et al. 2020

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“…PAA/SA was synthesized depending on the means of solution polymerization [31]. Specifically, 5 g of acrylic acid was weighed and added into a 100-mL beaker and then the prepared NaOH solution (25 wt.%) was dripped under stirring into the beaker until the pH value reached 6.5.…”

Section: Preparation Of Paa/sa-cc Composite Inhibitorsmentioning

confidence: 99%

Synchronous thermal analyses and kinetic studies on a caged-wrapping and sustained-release type of composite inhibitor retarding the spontaneous combustion of low-rank coal

Wang

et al. 2017

Fuel Processing Technology

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“…Natural hydrophilic polymers, such as sodium alginate and chitosan, are considered to be good raw materials for hydrogels, but their applications as hydrogels are limited due to their poor mechanical strength (Dragan 2014). The strength of hydrogels can be enhanced by constructing semi-interpenetrating polymer network, for example, by adding poly(acrylic acid) to sodium alginate (Wu et al 2015), or by adding poly(vinyl alcohol) to chitosan (Wan et al 2017). However, the mechanical strength of hydrogels decreases signifi y after swelling.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a three-dimensional network sodium alginate–poly(acrylic acid)/attapulgite hydrogel with good mechanic property and reusability for efficient adsorption of Cu2+ and Pb2+

Mao

Wang

et al. 2018

Environ Chem Lett

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et al.. Synthesis of a threedimensional network sodium alginate-poly(acrylic acid)/attapulgite hydrogel with good mechanic property and reusability for efficient adsorption of Cu2+ and Pb2+. AbstractWater pollution caused by heavy metals has dramatically impacted ecosystems in recent years. For instance, 45.4% of lakes in China are in the category of moderate to high risk of toxic metal pollution, due to excessive mining. There is, therefore, a need for efficient techniques of metal decontamination. Hydrogels are gaining interest as heavy metal adsorbents because of their easy separation, but hydrogel applications are limited due to their poor mechanical property. Here we solve this problem by introducing natural attapulgite into the sodium alginate-poly(acrylic acid) semi-interpenetrating polymer network of the hydrogel. Results show that the compressive stress of the hydrogel with 10% attapulgite, of 1.230 Mpa, was 4.1 times higher than that of pure hydrogel, of 0.299 MPa. The adsorption capacity of hydrogel with 10% attapulgite was high, of 272.8 mg/g for Cu 2+ and 391.7 mg/g for Pb 2+ . Even after five cycles of adsorption, the hydrogel with 10% attapulgite still adsorbs 261.7 mg/g Cu 2+ and 368.1 mg/g Pb 2+ . Our findings thus reveal that network-structured sodium alginate-poly(acrylic acid)/attapulgite hydrogel holds great potential as an efficient and recyclable adsorbent for heavy metal removal.

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Synthesis and properties of sodium alginate/poly(acrylic acid) double-network superabsorbent

Cited by 10 publications

References 24 publications

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

Synchronous thermal analyses and kinetic studies on a caged-wrapping and sustained-release type of composite inhibitor retarding the spontaneous combustion of low-rank coal

Synthesis of a three-dimensional network sodium alginate–poly(acrylic acid)/attapulgite hydrogel with good mechanic property and reusability for efficient adsorption of Cu2+ and Pb2+

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