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- Title
Characterization of peat samples collected from Brunei Darussalam and their evaluation as potential adsorbents for Cu(II) removal from aqueous solution.
- Authors
Zehra, Tasneem; Lim, Linda B.L.; Priyantha, Namal
- Abstract
In this study, the peat samples from two different sites of Brunei Darussalam (Mumong and Panaga) were investigated. The peats were found to be acidic in nature containing 66–75% organic matter. Thermogravimetric analysis revealed their thermal stability up to 500°C, while scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray fluorescence provided information on the modes of interaction of Cu(II) ions with peat through complexation and ion-exchange mechanisms. Further, the extent of removal of Cu(II) ions from aqueous solution investigated under different experimental conditions revealed that the optimum values for shaking time and medium pH were 3.0 h and 5.5, respectively. Equilibrium adsorption data fitted to the Langmuir, Freundlich, Temkin, Dubinin–Radushkevich (D–R), Redlich–Peterson (R–P), and Sips isotherm models indicated that adsorption of Cu(II) ions on peat obeyed the Sips model with an average adsorption capacity of 16.5 and 14.6 mg g−1for the Mumong and Panaga peat, respectively. Application of the pseudo-first-order, pseudo-second-order, Elovich, Boyd, and intraparticle diffusion models to evaluate the kinetics of the adsorption process led to the validity of the pseudo-second-order and intraparticle diffusion models to explain the adsorption of Cu(II) ions on the selected peat samples.
- Subjects
PEAT; COPPER absorption &; adsorption; AQUEOUS solutions; EQUILIBRIUM constant (Chemistry); THERMOGRAVIMETRY; THERMAL stability; SCANNING electron microscopy; ADSORPTIVE separation
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 44, p20889
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1110838