Temperature and pH-dependent swelling and copper(<scp>ii</scp>) adsorption of poly(N-isopropylacrylamide) copolymer hydrogel

Cheng, Jinjin; Shan, Guorong; Pan, Pengju

doi:10.1039/c5ra09965j

Cited by 58 publications

(48 citation statements)

References 42 publications

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“…Below its VPTT, the PNIPAM hydrogel swells due to its polymer chains existing in an expanded conformation, but above this temperature, this hydrogel shrinks due to its polymer chains collapsing to form a globule state . In hydrogels containing both PNIPAM and chelating or ionic components, the adsorption and desorption of heavy metal ions occurs by varying the temperature across the VPTT; this prevents secondary waste, such as acid solutions, from forming. This formation of secondary waste products is inevitable for widely used non‐thermoresponsive polymer adsorbents that incorporate ion exchange or chelating groups …”

Section: Introductionmentioning

confidence: 99%

Thermoresponsive‐interpenetrating polymer network hydrogels for heavy metal ion recovery

Ochi

Ida

Matsuyama

et al. 2018

J of Applied Polymer Sci

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Thermoresponsive-interpenetrating polymer network (TR-IPN) hydrogels containing a large number of chelating groups were synthesized; the aim was to ensure the recovery of large amounts of heavy metal ions through temperature cycling across volume phase transition temperature of the hydrogel. The TR-IPN hydrogels were synthesized from poly(N-isopropylacrylamide) and alginate, and the ability of these hydrogels to adsorb a heavy metal ion, Cu(II), was investigated at different temperatures. In the experiment, the hydrogels were prepared using various alginate and crosslinker concentrations. Despite the incorporation of a large number of chelating groups, the TR-IPN hydrogels exhibited a large thermoresponsive volume change regardless of the presence of Cu(II). The Cu(II) adsorption experiment showed that the saturated adsorption amount of the hydrogels was larger at 50 than at 10 8C. In addition, we demonstrated that the difference between the amounts adsorbed at 10 and 50 8C, which we consider to be the amount of Cu(II) that the TR-IPN hydrogels can recover through temperature cycling, was greater than those obtained by other conventional copolymerized thermoresponsive hydrogels.

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Section: Introductionmentioning

confidence: 99%

Thermoresponsive‐interpenetrating polymer network hydrogels for heavy metal ion recovery

Ochi

Ida

Matsuyama

et al. 2018

J of Applied Polymer Sci

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“…Heavy metal pollution is one of the most serious environmental problems . Removing heavy metal ions from water has become an advanced research hotspot .…”

Section: Introductionmentioning

confidence: 99%

“…Heavy metal pollution is one of the most serious environmental problems. 1 Removing heavy metal ions from water has become an advanced research hotspot. 2 Heavy metals are produced in metallurgy, electroplating, chemical engineering, mining and metal machining industries.…”

Section: Introductionmentioning

confidence: 99%

A facile ion imprinted synthesis of selective biosorbent for Cu²⁺ via microfluidic technology

Zhu

Bai

Luo

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND Heavy metal pollution has become one of the most serious environmental problems. Novel approaches are needed for removal of heavy metal from water. Copper, a familiar heavy metal, has attracted much attention for its remarkable toxic domino offect at elevated concentrations. RESULTS A novel ion imprinted approach combined with microfluidic technology was explored. Cu2+ was taken as ionic template and chitosan was used as carrier material. Chemical crosslinking was applied in the formation of imprinted sign. A selective biosorbent of ion‐imprinted microspheres (IIMS) with uniform size, regular shape and high performance for Cu2+ had been prepared. The SEM, FTIR, EDS, XPS were employed to detect their distinct features. IIMS showed much higher adsorption capacity (qm=81.97 mg g−1) than those non‐imprinted chitosan microspheres (CSMS). The adsorption isotherm fitted the Langmuir equation while thermodynamic adsorption results were considered strong proof of an adsorption exothermal process. IIMS exhibited excellent selectivity for Cu2+ when competitive metal ions and Cu2+ co‐existed together, which profited from the specific spaces of Cu2+ template left after crosslinking and desorption. Results confirmed that chemical adsorption was dominant and amino played an important role in adsorption process. CONCLUSION IIMS showed high adsorption capacity and excellent selectivity for Cu2+. Combining microfluidic technology with an ion‐imprinted method proved to be a promising process for preparing selective materials. © 2017 Society of Chemical Industry

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“…Complete solving of polymer synthesized from 27.5 mol% comonomer with C 6 alkyle residue is achieved within 48 h on both examined pH values (5.0 i 7.4). Hydrophobic helate radionuclide 64 Cu, bis(quinolin-8-olato-N,O) [ 64 Cu] copper, was used as a model substance. The radionuclide complex is efficiently entrapped within the synthesized polymers until their total dissolution through the process of hydrolysis, thus achieving a therapeutic effect.…”

Section: (1) (2018) 79-91mentioning

confidence: 99%

“…Poly(NIPAM) was used for absorption of Pb 2+ ion at the temperatures below LCST homopolymer in the study of Yu et al [63]. Hydrogels containing amino and amide groups can be used for the adsorption of heavy metals [64]. In the study of Chen et al, poly(NIPAM-co-AA) hydrogel was used for removing Cu 2+ ions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels based on N-isopropylmethacrylamide and N-isopropylacrylamide

Urošević¹,

Nikolić²,

Ilić‐Stojanović³

et al. 2018

Adv Techol

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Hydrogels are three-dimensional polymer networks which have the capacity to retain a large quantity of water or biological fluids in the swollen state. Thermosensitive hydrogels have received special attention of reserachers since they represent a parameter which frequently changes in chemical, biological and physiological systems. Thermosensitive hydrogels have the critical solution temperature, i.e. they exhibit a substantial change in volume with the temperature change. Homopolymers poly(N-isopropylmethacrylamide) (poly(NIPMAM)) and poly(N-isopropylacrylamide) (poly(NIPAM)) are thermosensitive materials which have lately become the subject of intensive study. Monomer N-isopropylmethacrylamide, NIPMAM, enters into copolymerization with monomer N-isopropylacrylamide, NIPAM, in order to create a system with a phase transition temperature approximate to the human body temperature. In literature data there is available information on the synthesis and characterization of microgels, nanogels and copolymers based on NIPMAM and NIPAM. These thermosensitive polymer materials are used in controlled drug delivery and protein immobilization.

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Temperature and pH-dependent swelling and copper(ii) adsorption of poly(N-isopropylacrylamide) copolymer hydrogel

Abstract: Poly(N-isopropylacrylamide-co-acrylamide-co-maleic acid) (PNIPAM-AM-MA) hydrogel, which can make the Cu2+ adsorption process stimuli-responsive under temperature and pH value control, has been synthesized by free radical polymerization.

Cited by 58 publications

References 42 publications

Thermoresponsive‐interpenetrating polymer network hydrogels for heavy metal ion recovery

Thermoresponsive‐interpenetrating polymer network hydrogels for heavy metal ion recovery

A facile ion imprinted synthesis of selective biosorbent for Cu²⁺ via microfluidic technology

Hydrogels based on N-isopropylmethacrylamide and N-isopropylacrylamide

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Temperature and pH-dependent swelling and copper(ii) adsorption of poly(N-isopropylacrylamide) copolymer hydrogel

Abstract: Poly(N-isopropylacrylamide-co-acrylamide-co-maleic acid) (PNIPAM-AM-MA) hydrogel, which can make the Cu2+ adsorption process stimuli-responsive under temperature and pH value control, has been synthesized by free radical polymerization.

Cited by 58 publications

References 42 publications

Thermoresponsive‐interpenetrating polymer network hydrogels for heavy metal ion recovery

Thermoresponsive‐interpenetrating polymer network hydrogels for heavy metal ion recovery

A facile ion imprinted synthesis of selective biosorbent for Cu2+ via microfluidic technology

Hydrogels based on N-isopropylmethacrylamide and N-isopropylacrylamide

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Product

Resources

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A facile ion imprinted synthesis of selective biosorbent for Cu²⁺ via microfluidic technology