Poly-L-Histidine Attached Poly(glycidyl methacrylate) Cryogels for Heavy Metal Removal
Duygu Çimen, Deniz Türkmen, A. Deni̇zli̇
- Yazarlar
- Duygu Çimen, Deniz Türkmen, A. Deni̇zli̇
- Yayın
- 2015
- DOI
- 10.1080/10601325.2015.1063868
- Atıflar
- 15
Özet
Poly-L-histidine immobilized poly(glycidyl methacrylate) (PGMA) cryogel discs were used for the removal of heavy metal ions [Pb(II), Cd(II), Zn(II) and Cu(II)] from aqueous solutions. In the first step, PGMA cryogel discs were synthesized using glycidyl methacrylate (GMA) as a basic monomer and methylene bisacrylamide (MBAAm) as a cross linker in order to introduce active epoxy groups through the polymeric backbone. Then, the metal chelating groups are incorporated to cryogel discs by immobilizing poly-L-histidine (mol wt ≥ 5000) having poly-imidazole ring. The swelling test, fourier transform infrared spectroscopy and scanning electron microscopy were performed to characterize both the PGMA and poly-L-histidine immobilized PGMA [P-His@PGMA] cryogel discs. The effects of the metal ion concentration and pH on the adsorption capacity were studied. These parameters were varied between 3.0–6.0 and 10–800 mg/L for pH and metal ion concentration, respectively. The maximum adsorption capacity of heavy metal ions of P-His@PGMA cryogel discs were 6.9 mg/g for Pb(II), 6.4 mg/g for Cd(II), 5.6 mg/g for Cu(II) and 4.3 mg/g for > Zn(II). Desorption of heavy metal ions was studied with 0.1 M HNO3 solution. It was observed that cryogel discs could be recurrently used without important loss in the adsorption amount after five repetitive adsorption/desorption processes. Adsorption isotherms were fitted to Langmuir model and adsorption kinetics were suited to pseudo-second order model. Thermodynamic parameters (i.e. ΔH° ΔS°, ΔG°) were also calculated at different temperatures.
Bu makaleye atıf yapın
Duygu Çimen, Deniz Türkmen, A. Deni̇zli̇ (2015). Poly-L-Histidine Attached Poly(glycidyl methacrylate) Cryogels for Heavy Metal Removal. https://doi.org/10.1080/10601325.2015.1063868
BibTeX
@article{duygu2015,
title = {Poly-L-Histidine Attached Poly(glycidyl methacrylate) Cryogels for Heavy Metal Removal},
author = {Duygu Çimen and Deniz Türkmen and A. Deni̇zli̇},
doi = {10.1080/10601325.2015.1063868},
year = {2015}
}