Thermo-responsive properties of poly(N-isopropylacrylamide-co-acrylic acid) hydrogel and its effect on copper ion removal and fouling of polymer-enhanced ultrafiltration

Chen, J.J.; Ahmad, A.L.; Ooi, B. S.

doi:10.1016/j.memsci.2014.05.062

Cited by 33 publications

(12 citation statements)

References 33 publications

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“…Retaining the Cu 2+ ion and hydrogel complex on the cellulose acetate membrane was more favourable at the temperature lower than 40 °C and pH=5. It was concluded that environmental factors, temperature and pH, have influence on the adsorption process of Cu 2+ ion on p(NIPAM/AA) hydrogel [57].…”

Section: *Mmol/gmentioning

confidence: 99%

The application of hydrogels based on N-isopropylacrylamide and anionic comonomers

Zdravkovic¹,

Nikolic²,

Ilić‐Stojanović³

et al. 2017

Adv techn

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Hydrogels represent three-dimensional networks of polymer chains that have the ability of absorption of a significant amount of water or biological fluid. A special group of hydrogels are copolymers which respond to changes of pH values and temperature. Desirable characteristics of temperature-and pH-sensitive hydrogels based on N-isopropylacrylamide and anionic comonomers for different applications, from pharmaceutical to the environmental one, can be designed by composition of copolymers. The presence of the amide and carboxyl group in the structure of these hydrogels enables their application as adsorbents in the processes of removing the pollutants from aqueous solutions. Hydrogels based on N-isopropylacrylamide and anionic comonomers represent desirable three-dimensional matrices for controlled and sustained release of agrochemicals and drugs in relation to temperature and pH of the surrounding medium. Hydrogels, as separation devices, perform the concentrating of compounds or microorganisms solutions by absorption of greater amounts of water. One more application of these copolymers is for immobilization of enzymes.

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Section: *Mmol/gmentioning

confidence: 99%

The application of hydrogels based on N-isopropylacrylamide and anionic comonomers

Zdravkovic¹,

Nikolic²,

Ilić‐Stojanović³

et al. 2017

Adv techn

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“…In the case of heavy metal ions removal, different physicochemical properties of hydrogels can be taken into account [86][87][88][89][90][91]. Hydrogels (with and without magnetic properties) based on natural polysaccharides for Cd(II) removal from aqueous solutions were described in [92].…”

Section: Heavy Metal Ions Removalmentioning

confidence: 99%

Hydrogels from Fundaments to Application

Kołodyńska¹,

Skiba²,

Górecka³

et al. 2016

Emerging Concepts in Analysis and Applications of Hydrogels

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Polymer superabsorbents commonly known as hydrogels are cross-linked highly molecular compounds able to absorb water from physicochemical fluids in the amounts from 10-fold to 100-fold larger than their dry mass. Numerous investigations have shown that they can help reduce irrigation water consumption, lower the death rate of plants, improve fertilizer retention in soil and increase plant growth rate. Besides water absorption and retention, the superabsorbent polymers have many advantages over conventional ones, such as a sustained supply of nutrition to plants for a longer time, thus increasing the phosphate fertilizer use efficiency and decreasing application frequency. The aim of this study is to investigate the influence of chemical conditions on hydrogels, kinetic and absorption behaviour towards metal ions in the presence of the chelating agent of a new generation. In this group, there are IDS, EDDS, GLDA, MGDA, etc. In the chapter, the research on the applicability of the effective absorption of metal complexes with a biodegradable complexing agent will be presented. The possibility of the preparation of slow-release fertilizers of controlled activity of a new generation in such system will also be discussed.

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“…41,42 Therefore, copolymers derived from PNIPAM and carboxyl monomers can provide an excellent removal capacity. 43,44…”

Section: Introductionmentioning

confidence: 99%

Nanoadsorbents Based on NIPAM and Citric Acid: Removal Efficacy of Heavy Metal Ions in Different Media

et al. 2019

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Heavy metal ions in aqueous solutions are harmful to human health, but exploring and exploiting nanoadsorbents with a high adsorption capacity and low cost should be an effective method for overcoming this problem. In this study, a novel nanoadsorbent termed poly( N -isopropylacrylamide- co -citric acid) (PNCA) was designed and synthesized via free-radical polymerization. PNCA exhibits good solubility in aqueous solutions and can self-assemble into spherical nanoaggregates with a mean hydrodynamic diameter of approximately 723.1 nm. After freeze-drying, the solid powder of PNCA exhibited a loose porous structure. When PNCA is dissolved in water, the resulting copolymer solution exhibits high removal rates for Cu 2+ and Pb 2+ of over 80%; meanwhile, over 97% of the PNCA is precipitated with metal ions. The adsorption process of PNCA chelated with Cu 2+ ions fit the Freundlich model. The adsorption capacity is independent of the media pH, but could be affected by the temperature. Except for herbal medicines with alkaloids as active ingredients, PNCA also presents good adsorption capacity for Cu 2+ in herbal medicine decoctions, with a removal rate of over 80%. The cell cytotoxicity in vitro and system toxicity in vivo demonstrate the desirable biosafety of PNCA. These results suggest that PNCA with good biosafety can be utilized as a nanoadsorbent to remove the metal ions, especially Cu 2+ , in different media.

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Thermo-responsive properties of poly(N-isopropylacrylamide-co-acrylic acid) hydrogel and its effect on copper ion removal and fouling of polymer-enhanced ultrafiltration

Cited by 33 publications

References 33 publications

The application of hydrogels based on N-isopropylacrylamide and anionic comonomers

The application of hydrogels based on N-isopropylacrylamide and anionic comonomers

Hydrogels from Fundaments to Application

Nanoadsorbents Based on NIPAM and Citric Acid: Removal Efficacy of Heavy Metal Ions in Different Media

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