Hydrogel nanocomposite sorbents for removal of basic dyes

Kaplan, Mahir; Kaşgöz, Hasine

doi:10.1007/s00289-011-0444-9

Cited by 50 publications

(19 citation statements)

References 35 publications

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“…Recently, polymer/clay nanocomposites have been studied to improve the properties of hydrogels such as swelling and deswelling properties and mechanical strength [4, 9–11]. Montmorillonite (MMT) [12, 13], kaolin [14], mica [15, 16], attapulgite [17], and halloysite [15] have already been incorporated into the polymer structure. However, to achieve the superior characteristics of nanocomposite hydrogels, it is necessary for clay platelets to act as multifunctional crosslinkers [11, 18–20].…”

Section: Introductionmentioning

confidence: 99%

Poly(2‐hydroxyethyl methacrylate) nanocomposites: From a nonionic gel to pH sensitivity

Cavusoglu

Kaşgöz

2011

Polymer Composites

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2‐Hydroxyethyl methacrylate (HEMA)‐clay nanocomposites were prepared via in situ free radical polymerization using montmorillonite (MMT) as a crosslinker. The structure and surface morphology of the nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction, and scanning electron microscopy. It was found that exfoliated or highly expanded intercalated nanocomposite structure was obtained. The swelling degree was determined in distilled water and various pH buffered solutions. The highest swelling capacity in distilled water was observed for the nanocomposite sample prepared with the MMT amount of 10 % (w). It was seen that the diffusion mechanism was Fickian type in distilled water and also in various pH‐buffered solutions. It is interesting that the swelling degree of nanocomposites in alkaline pH values increased by the increasing of MMT in the polymer structure. This result supports the possibility of future applications of the novel nanocomposite in systems for the controlled released of drugs. POLYM. COMPOS., 2011. © 2011 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Poly(2‐hydroxyethyl methacrylate) nanocomposites: From a nonionic gel to pH sensitivity

Cavusoglu

Kaşgöz

2011

Polymer Composites

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“…The decreasing of swelling capacity after a critical clay amount may be originated from the decrease in ionization of Na-MMT and subsequent decrease in osmotic pressure. On the other hand, higher clay amount could cause the formation of more crosslinked points (29)(30)(31). In other series of the experiments, the hydrogel nanocomposites were prepared by using different types of clay, mica and halloysite.…”

Section: Degree Of Swellingmentioning

confidence: 99%

Structurally Enhanced Hydrogel Nanocomposites with Improved Swelling and Mechanical Properties

Kaşgöz

Durmuş

Kaşgöz

et al. 2012

Journal of Macromolecular Science, Part A

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In this work, structurally enhanced hydrogel nanocomposites based on 2-acrylamido-2 methyl propane sulfonic acid (AMPS)-acrylamide (AAM) copolymer with high hydrophilic group content were prepared by in-situ copolymerization by using different types of clay (montmorillonite, mica and halloysite). Nanocomposite hydrogels were characterized by Fourier-Transform Infrared Spectroscopy (FTIR) and X-ray diffraction (XRD) analyses and determination of swelling degrees of the samples. Mechanical properties of the samples were also investigated by determination of the compressive elastic modulus. It was also found that exfoliated or highly expanded intercalated nanocomposite structure was obtained and clay incorporation into the AMPS-AAM hydrogel structure improved its swelling capacity. The highest swelling capacity (1030 g H 2 O/g) was observed for the nanocomposite sample prepared with the montmorillonite amount of 5% (w). Furthermore, mechanical strength of the hydrogels against compression forces was significantly improved by the clay addition. It was found that the type of clay, in other word filler geometry, affected the compressive elastic modulus (E) of the samples. It was concluded that halloysite, which is considered to be a one dimensional (1D) nanotubular filler was less effective to enhance the compressive elastic modulus (E) of such materials compared with the montmorillonite and mica having two dimensional (2D) platelet or disk-like shapes at a particular amount of clay.

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“…Such materials are efficient absorbents due to their functional groups [11] and are often tested in water purification. Heavy metals e Pb [4,8,9], Ni [4], Cd [4,9], Cu [4,8,9], dyes [5,10] or ammonium cations [7] are adsorbed on composites. It has been found that these materials are better adsorbents than hydrogels because of their higher adsorption capacity and enhanced mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Different hydrogels e polyacrylic acid [4e6], chitosan-g-polyacrylic acid [7], starch e acrylic acid graft copolymer [8], acryloamide e 2-acryloamido-2-methylpropane sulfonic acid sodium salt copolymer [9], acryloamide e itaconic acid copolymer [10] were modified by adding layered silicates, mainly montmorillonites. Such materials are efficient absorbents due to their functional groups [11] and are often tested in water purification.…”

Section: Introductionmentioning

confidence: 99%

Controlled swelling and adsorption properties of polyacrylate/montmorillonite composites

Natkański

Kuśtrowski

Białas

et al. 2012

Materials Chemistry and Physics

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Hydrogel nanocomposite sorbents for removal of basic dyes

Cited by 50 publications

References 35 publications

Poly(2‐hydroxyethyl methacrylate) nanocomposites: From a nonionic gel to pH sensitivity

Poly(2‐hydroxyethyl methacrylate) nanocomposites: From a nonionic gel to pH sensitivity

Structurally Enhanced Hydrogel Nanocomposites with Improved Swelling and Mechanical Properties

Controlled swelling and adsorption properties of polyacrylate/montmorillonite composites

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