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Sorption characteristics of peat of Brunei Darussalam IV: equilibrium, thermodynamics and kinetics of adsorption of methylene blue and malachite green dyes from aqueous solution
Sorption characteristics of peat of Brunei Darussalam IV: equilibrium, thermodynamics and kinetics of adsorption of methylene blue and malachite green dyes from aqueous solution
- Source :
- Environmental Earth Sciences. 72:2263-2277
- Publication Year :
- 2014
- Publisher :
- Springer Science and Business Media LLC, 2014.
-
Abstract
- Peat of Brunei Darussalam shows a great potential for the removal of methylene blue (MB) and malachite green (MG) dyes from aqueous solution. Carefully controlled batch experiments performed by changing one parameter at a time indicate that the optimum time periods of agitation and settling required for maximum removal of MB are 2.0 and 1.0 h, respectively, while these values for MG are 4.0 and 1.0 h, respectively. The optimum pH is determined to be the ambient value, and under the optimum conditions, 90 % removal of both dyes was determined under laboratory conditions. The equilibrium adsorption data analyzed for various isotherm models suggest that the Sips and Redlich–Peterson (R–P) models are valid for MB and MG, respectively. Further, thermodynamic studies show that the adsorption of both dyes on peat is spontaneous and endothermic. The adsorption capacities (q max) of MB and MG dyes on peat are 0.45 and 0.31 mmol g−1, respectively. Characterization of the surfaces of peat before and after treatment of dyes by SEM and FTIR provides conclusive evidence of adsorption of both dyes. Kinetics studies indicate that the adsorption of both MB and MG dyes is favored toward the pseudo-second-order model, with a little contribution of MG to the pseudo-first-order model. These results suggest that peat is a potential low-cost adsorbent for the removal of MB and MG dyes.
- Subjects :
- Global and Planetary Change
Chromatography
Aqueous solution
Kinetics
Soil Science
Geology
Sorption
Pollution
Endothermic process
chemistry.chemical_compound
Adsorption
Equilibrium thermodynamics
chemistry
Environmental Chemistry
Malachite green
Methylene blue
Earth-Surface Processes
Water Science and Technology
Nuclear chemistry
Subjects
Details
- ISSN :
- 18666299 and 18666280
- Volume :
- 72
- Database :
- OpenAIRE
- Journal :
- Environmental Earth Sciences
- Accession number :
- edsair.doi...........d77bb3222aaaddc7fa2ae523d33e9b31
- Full Text :
- https://doi.org/10.1007/s12665-014-3135-7