Adsorption Behaviour of Hg(II) from Acetate Medium onto PAR-Imbedded Polyurethane Foam
The sorption behaviour of a 2.46 • 10 −5 M solution of Hg(II) on 4-(2-pyridylazo)resorcinol (PAR)-loaded polyurethane foam (PUF) was investigated. Optimum sorption was observed from acetate medium at pH 6 with the maximum equilibration time being 30 min. The kinetic data indicated an intraparticle d...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2003-02-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/02636170360699822 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The sorption behaviour of a 2.46 • 10 −5 M solution of Hg(II) on 4-(2-pyridylazo)resorcinol (PAR)-loaded polyurethane foam (PUF) was investigated. Optimum sorption was observed from acetate medium at pH 6 with the maximum equilibration time being 30 min. The kinetic data indicated an intraparticle diffusion process with sorption being first order. The rate constant k was 0.053 min −1 . The classical Freundlich and Langmuir adsorption isotherms were tested. The Freundlich constants 1/n and K f were determined as 0.40 and 1.07 • 10 −3 mol/g, respectively, and the Langmuir constants ‘M’ and ‘b’ were 3.84 • 10 −5 mol/g and 3.5 • 10 4 dm 3 /mol, respectively. A sorption free energy (E) of 12.9 kJ/mol indicated chemisorption. The numerical values of the thermodynamic parameters ΔH, ΔS and ΔG indicated that sorption was spontaneous and exothermic in nature. The Scatchard equation was tested as a means of evaluating the binding sites of PUF with Hg(II). The stability constants for sorption were determined and the sorption mechanism was discussed. |
|---|---|
| ISSN: | 0263-6174 2048-4038 |