Adsorption-desorption characteristic of thermo-magneto-responsive poly(N-isopropylacrylamide)-co-acrylic acid composite hydrogel towards chromium (III) ions

In this work, cellulose nanocrystals (CNCs) obtained by the acid hydrolysis of waste bamboo powder were used to synthesize cellulose nanocrystal-g-poly(acrylic acid-co-acrylamide) (CNC-g-P(AA/AM)) aerogels via graft copolymerization followed by freeze-drying. The structure and morphology of the resulting aerogels were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the CNC-g-P(AA/AM) aerogels exhibited excellent absorbent properties and adsorption capacities. Subsequent Pb(II) adsorption studies showed that the kinetic data followed the pseudo-second-order equation, while the adsorption isotherms were best described using the Langmuir model. The maximum Pb(II) adsorption capacity calculated by the Langmuir model reached up to 366.3 mg/g, which is a capacity that outperformed that of the pure CNC aerogel. The CNC-g-P (AA/AM) aerogels become structurally stable through chemical cross-linking, which enabled them to be easily regenerated in HCl solution and retain the adsorption capacity after repeated use. The aerogels were found to maintain 81.3% removal efficiency after five consecutive adsorption–desorption cycles. Therefore, this study demonstrated an effective method for the fabrication of an aerogel adsorbent with an excellent reusability in the effective removal of Pb(II) from aqueous solutions.

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Electroactive behavior assessment of poly(acrylic acid)-graphene oxide composite hydrogel in the detection of cadmium

Journal of Applied Polymer Science ◽

10.1002/app.40846 ◽

2014 ◽

Vol 131 (19) ◽

pp. n/a-n/a ◽

Cited By ~ 9

Author(s):

Areli Bejarano-Jiménez ◽

Vladimir A. Escobar-Barrios ◽

J. Mieke Kleijn ◽

Cesar A. Ortíz-Ledón ◽

Luis F. Cházaro-Ruiz

Keyword(s):

Graphene Oxide ◽

Acrylic Acid ◽

Composite Hydrogel ◽

Behavior Assessment ◽

Oxide Composite ◽

Poly Acrylic Acid

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Effect of attapulgite contents on release behaviors of a pH sensitive carboxymethyl cellulose-g-poly(acrylic acid)/attapulgite/sodium alginate composite hydrogel bead containing diclofenac

Journal of Applied Polymer Science ◽

10.1002/app.35440 ◽

2011 ◽

pp. n/a-n/a ◽

Cited By ~ 1

Author(s):

Qin Wang ◽

Wenbo Wang ◽

Jie Wu ◽

Aiqin Wang

Keyword(s):

Acrylic Acid ◽

Sodium Alginate ◽

Carboxymethyl Cellulose ◽

Ph Sensitive ◽

Composite Hydrogel ◽

Hydrogel Bead ◽

Poly Acrylic Acid

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

Polymers ◽

10.3390/polym12010151 ◽

2020 ◽

Vol 12 (1) ◽

pp. 151 ◽

Cited By ~ 7

Author(s):

Juan Tan ◽

Shuibo Xie ◽

Guohua Wang ◽

Chuck Wah Yu ◽

Taotao Zeng ◽

...

Keyword(s):

Aqueous Solution ◽

Acrylic Acid ◽

Carboxymethyl Cellulose ◽

Maximum Adsorption Capacity ◽

Chemical Structures ◽

Orthogonal Experiments ◽

Pseudo Second Order ◽

Simulated Wastewater ◽

Adsorption Desorption ◽

Polymerization Method

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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