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  • 1.
    Bhatnagar, Amit
    et al.
    Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
    Jain, A.K.
    A comparative adsorption study with different industrial wastes as adsorbents for the removal of cationic dyes2005In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 281, p. 49-55Article in journal (Refereed)
  • 2. Bhatnagar, Amit
    et al.
    Repo, E.
    Warchol, J.K.
    Sillanpää, Mika
    Heavy metals adsorption by novel EDTA-modified chitosan-silica hybrid materials2011In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 358, no 1, p. 261-267Article in journal (Refereed)
    Abstract [en]

    Novel adsorbents were synthesized by functionalizing chitosan-silica hybrid materials with (ethylenediaminetetraacetic acid) EDTA ligands. The synthesized adsorbents were found to combine the advantages of both silica gel (high surface area, porosity, rigid structure) and chitosan (surface functionality). The Adsorption potential of hybrid materials was investigated using Co(II), Ni(II), Cd(II), and Pb(II) as target metals by varying experimental conditions such as pH, contact time, and initial metal concentration. The kinetic results revealed that the pore diffusion process played a key role in adsorption kinetics, which might be attributed to the porous structure of synthesized adsorbents. The obtained maximum adsorption capacities of the hybrid materials for the metal ions ranged from 0.25 to 0.63 mmol/g under the studied experimental conditions. The adsorbent with the highest chitosan content showed the best adsorption efficiency. Bi-Langmuir and Sips isotherm model fitting to experimental data suggested the surface heterogeneity of the prepared adsorbents. In multimetal solutions, the hybrid adsorbents showed the highest affinity toward Pb(II).

  • 3. Jain, A.K.
    et al.
    Suhas, S.
    Bhatnagar, Amit
    Methylphenols removal from water by low-cost adsorbents2002In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 251, no 1, p. 39-45Article in journal (Refereed)
  • 4.
    Sundberg, Mark
    et al.
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Månsson, Alf
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Tågerud, Sven
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Contact angle measurements by confocal microscopy for non-destructive microscale surface characterization2007In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 313, p. 454-460Article in journal (Refereed)
  • 5.
    Suriyanarayanan, Subramanian
    et al.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Lee, Hung-Hsun
    Linköping University.
    Liedberg, Bo
    Linköping University.
    Aastrup, Teodor
    Attana AB, Stockholm.
    Nicholls, Ian A.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences. Uppsala University.
    Protein-resistant hyperbranched polyethyleneimine brush surfaces2013In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 396, p. 307-315Article in journal (Refereed)
    Abstract [en]

    A novel hyperbranched polyethyleneimine (PEI) modified gold surface has been designed, fabricated, and investigated with respect to its ability to resist non-specific adsorption of proteins. The facile synthesis strategy, based on self-assembly, involves immobilization of polyethyleneimine to gold surfaces modified with 11-mercaptoundecanoic acid (MuDA) monolayers using traditional carbodiimide chemistry. The hyperbranched polymer brushes were characterized by X-ray photoelectron spectroscopy (XPS). Reflection absorption infrared spectroscopy (RAIRS) and ellipsometry measurements showed the thickness of the PEI brushes increases with adsorption solution ionic strength. Polymer brush surface concentrations can be improved from 2560 to 3880 chains/mu m(2) by changing the ionic strength of the adsorption solution (PBS) by varying NaCl concentration from 0 to 650 mM. Protein adsorption (pH 7.4) was evaluated under flow injection analysis (FIA) conditions using a quartz crystal microbalance (QCM). The PEI brushes suppress protein adsorption, for example, cytochrome C, bovine serum albumin (BSA), and ribonuclease A, to less than 0.08 mu g/cm(2) and the protein resistance increases with increasing ionic strength of the carrier solution, performance comparable to that achieved with comparable PEG-coated surfaces. The PEI brushes were exceptionally stable, with adsorption characteristics maintained after 6 months storage in aqueous conditions (pH 7.4, 25 degrees C, PBS). The potential of hyperbranched PEI structures as protein-resistant surfaces is discussed. (C) 2013 Elsevier Inc. All rights reserved.

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