Adsorption of lead and copper on modified polyacrylonitrile bead

Godjevargova, Tzonka; Simeonova, A.; Dimov, A.

doi:10.1002/1097-4628(20010110)79:2<283::aid-app90>3.0.co;2-2

Cited by 23 publications

(5 citation statements)

References 3 publications

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“…In this study, nitrogenous functional groups were used to treat PET surfaces. The effectiveness of protein attachment to aminated surfaces has been demonstrated by a number of authors 2–8. The initial modification step in other reported methods has often involved the attachment of nitrogenous functionalities via plasma and silane treatments.…”

Section: Introductionmentioning

confidence: 99%

Characterization of aminated poly(ethylene terephthalate) surfaces for biomedical applications

Nissen

Stuart

Stevens

et al. 2007

J of Applied Polymer Sci

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Aminated poly(ethylene terephthalate) (PET) surfaces were characterized for their use as substrates for the attachment of biologically active molecules. Amines of different chain lengths, tetraethylenepentamine, triethylenetetraamine (TTETA), and diethylenetriamine (DETA), were investigated. X-ray photoelectron spectroscopy was used to show that each amine introduced a comparable amount of nitrogen (5 atom %) to the PET surface. Contact-angle and titration analyses indicated that the amination reaction was not restricted to the surface, with evidence of diffusion into the polymer by TTETA and DETA. As a result, degradation of the PET substrate, evidenced by mass loss, was observed to occur. Annealing of the PET films before amination at a temperature of 2008C reduced the extent of degradation without producing a decrease in the nitrogen content produced.

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Section: Introductionmentioning

confidence: 99%

Characterization of aminated poly(ethylene terephthalate) surfaces for biomedical applications

Nissen

Stuart

Stevens

et al. 2007

J of Applied Polymer Sci

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“…In a previous study,9 we prepared porous PAN beads with defined porosity and then made six types of chemically modified sorbents. We proved that the modified PAN sorbent with NaOH and NH 2 OH (AMCAPAN) had the best sorption characteristics.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of heavy metal ions from aqueous solutions by porous polyacrylonitrile beads

Godjevargova

Simeonova

Dimov

2002

J of Applied Polymer Sci

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ABSTRACT:The adsorption of Cu(II), Ni(II), Zn(II), and Pb(II) from aqueous solutions on acrylonitrile copolymer sorbents was studied. We prepared five types of sorbents from polyacrylonitrile by varying its concentration in the initial polymer solution and the composition of the coagulation bath, aiming to achieve a different porous structure. The specific area, pore volume, and pore radius of the sorbents were determined on a porosimeter. The porous structure was studied by scanning electron microscopy. Modification of sorbents with sodium hydroxide and hydroxylamine was carried out to form amidooxyme and carboxylic groups with proven complex-forming properties toward heavy metal ions. The optimal pH of the sorption of metal ions was found. The adsorption kinetics were investigated. The order of polymer sorbents toward the sorption of Pb(II), Cu(II), Ni(II), and Zn(II) ions, and the order of heavy metal uptake were determined for all types of sorbents. The effectiveness of heavy metal desorption and the coefficient of recovery of sorption ability were determined.

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“…A higher number of TC units per β‐CD are an indication of a higher crosslinking degree. Before interfacial polymerization occurs, some of the hydroxyl ions present in the aqueous phase are consumed to ionize β‐CD molecules and to partially hydrolyze the PAN support . For this reason NaOH concentrations of 1 m or more were needed for sufficient presence of hydroxyl ions inside the pores of the support to hydrolyze the β‐CD film at the rate necessary to achieve the desired crumpled morphology.…”

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confidence: 99%

Cyclodextrin Films with Fast Solvent Transport and Shape‐Selective Permeability

2017

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This study describes the molecular-level design of a new type of filtration membrane made of crosslinked cyclodextrins-inexpensive macrocycles of glucose, shaped like hollow truncated cones. The channel-like cavities of cyclodextrins spawn numerous paths of defined aperture in the separation layer that can effectively discriminate between molecules. The transport of molecules through these membranes is highly shape-sensitive. In addition, the presence of hydrophobic (cavity) and hydrophilic (ester-crosslinked outer part) domains in these films results in high permeances for both polar and nonpolar solvents.

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Adsorption of lead and copper on modified polyacrylonitrile bead

Cited by 23 publications

References 3 publications

Characterization of aminated poly(ethylene terephthalate) surfaces for biomedical applications

Characterization of aminated poly(ethylene terephthalate) surfaces for biomedical applications

Adsorption of heavy metal ions from aqueous solutions by porous polyacrylonitrile beads

Cyclodextrin Films with Fast Solvent Transport and Shape‐Selective Permeability

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