Adsorption of Lead Ions ontoN-Isopropylacrylamide and Acrylic Acid Copolymer Microgels

Morris, Gayle E.; Vincent, Brian; Snowden, Martin J.

doi:10.1006/jcis.1997.4843

Cited by 234 publications

(183 citation statements)

References 3 publications

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“…In many cases, microgels are composed of poly(N-isopropylacrylamide) (pNIPAm), which is a typical thermosensitive polymer with a lower critical solution temperature of around 31 1C. 5,6 PNIPAm-based microgels can be functionalized by constructing nanocomposites with inorganic nanoparticles [7][8][9][10] for application in more complex biotechnologies and nanotechnologies (for example, drug delivery, 11,12 chemical/biological separation 13,14 and photonic crystals [15][16][17][18] ). In addition, we reported that microgels can show selfoscillation, [19][20][21][22] coupled with the Belousov-Zhabotinsky (BZ) reaction, 23 which is an autonomous and periodic chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Self-oscillating core/shell microgels: effect of a crosslinked nanoshell on autonomous oscillation of the core

Suzuki

Yoshida

2010

Polym J

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We reported the effects of crosslinked nanoshells covering self-oscillating microgels on their oscillatory behaviors. We carried out seeded precipitation polymerization of N-substituted acrylamide derivatives using preformed, self-oscillating microgels as cores. The core/shell microgels obtained were characterized by dynamic light scattering. Oscillating behaviors were characterized by changes in optical transmittance. In addition, the characteristics (that is, induction period, oscillating period and waveform) of the oscillation of the core/shell microgels were compared with that of the parent core microgel to clarify the effect of the addition of a nanoshell on the autonomous oscillating behaviors of microgels.

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Section: Introductionmentioning

confidence: 99%

Self-oscillating core/shell microgels: effect of a crosslinked nanoshell on autonomous oscillation of the core

Suzuki

Yoshida

2010

Polym J

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“…Thermoresponsive polymers with a lower critical solution temperature (LCST) are interesting for various applications such as controlled drug delivery, 1−4 enhanced oil recovery, 5 sensors, 6−8 water purification, 5,9 and in vivo imaging for, e.g., tumor diagnosis. 10 Solutions and suspensions of polymers with a LCST behavior are characterized by a transition from clear to turbid solutions when heated, and this transition temperature is denoted the cloud point temperature of the solution.…”

Section: ■ Introductionmentioning

confidence: 99%

Thermoresponsive Poly(2-oxazoline) Block Copolymers Exhibiting Two Cloud Points: Complex Multistep Assembly Behavior

et al. 2012

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Aqueous solutions of poly(2-oxazoline) block copolymers consisting of a 2-ethyl-2-oxazoline block and a block consisting of a random copolymer of 2-ethyl-2-oxazoline and 2-n-propyl-2-oxazoline (PEtOx-block-P(EtOx-stat-PropOx)) have been studied by dynamic light scattering (DLS), static light scattering (SLS), and turbidimetry. Even at temperatures significantly below the lower critical solution temperature (LCST), polymer unimers are found to coexist with a few large aggregates with an open structure. When heated, the systems exhibit an intricate transmittance behavior whereby the samples becomes visually clear again after an initial cloud point and then exhibit a second cloud point at even higher temperatures. The DLS data indicate that the aggregates formed around the first cloud point restructure and fragment into smaller micelle-like structures ascribed to further dehydration of the more hydrophobic PPropOx containing block, causing the samples to become optically clear again. The observed fragmentation is confirmed by the SLS experiments. At even higher temperatures, both blocks become hydrophobic, causing the formation of large, compact aggregates, resulting in a second cloud point.

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“…33 The first linear portion is the external surface adsorption stage. The second portion is the gradual adsorption stage, in which the intraparticle diffusion is rate-controlled.…”

Section: Pore Diffusion Studiesmentioning

confidence: 99%

Porous dye affinity beads for nickel adsorption from aqueous solutions: A kinetic study

Akgöl

Kuşvuran

Kara

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:We investigated a new adsorbent system, Reactive Red 120 attached poly(2-hydroxyethyl methacrylate ethylene dimethacrylate) [poly(HEMA-EDMA)] beads, for the removal of Ni 2ϩ ions from aqueous solutions. Poly-(HEMA-EDMA) beads were prepared by the modified suspension copolymerization of 2-hydroxyethyl methacrylate and ethylene dimethacrylate. Reactive Red 120 molecules were covalently attached to the beads. The beads (150 -250 m), having a swelling ratio of 55% and carrying 25.5 mol of Reactive Red 120/g of polymer, were used in the removal of Ni 2ϩ ions. The adsorption rate and capacity of the Reactive Red 120 attached poly(HEMA-EDMA) beads for Ni 2ϩ ions was investigated in aqueous media containing different amounts of Ni 2ϩ ions (5-35 mg/L) and having different pH values (2.0 -7.0). Very high adsorption rates were observed at the beginning, and adsorption equilibria were then gradually achieved in about 60 min. The maximum adsorption of Ni 2ϩ ions onto the Reactive Red 120 attached poly(HEMA-EDMA) beads was 2.83 mg/g at pH 6.0. The nonspecific adsorption of Ni 2ϩ ions onto poly(HEMA-EDMA) beads was negligible (0.1 mg/g). The desorption of Ni 2ϩ ions was studied with 0.1M HNO 3 . High desorption ratios (Ͼ90%) were achieved. The intraparticle diffusion rate constants at various temperatures were calculated as k 20°C ϭ 0.565 mg/g min 0.5 , k 30°C ϭ 0.560 mg/g min 0.5 , and k 40°C ϭ 0.385 mg/g min 0.5 . Adsorption-desorption cycles showed the feasibility of repeated use of this novel adsorbent system. The equilibrium data fitted very well both Langmuir and Freundlich adsorption models. The pseudo-first-order kinetic model was used to describe the kinetic data.

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Adsorption of Lead Ions ontoN-Isopropylacrylamide and Acrylic Acid Copolymer Microgels

Cited by 234 publications

References 3 publications

Self-oscillating core/shell microgels: effect of a crosslinked nanoshell on autonomous oscillation of the core

Self-oscillating core/shell microgels: effect of a crosslinked nanoshell on autonomous oscillation of the core

Thermoresponsive Poly(2-oxazoline) Block Copolymers Exhibiting Two Cloud Points: Complex Multistep Assembly Behavior

Porous dye affinity beads for nickel adsorption from aqueous solutions: A kinetic study

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