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- Title
Malachite green and crystal violet biosorption onto coco-peat: characterization and removal studies.
- Authors
Vijayaraghavan, K.; Premkumar, Y.; Jegan, J.
- Abstract
In this study, coco-peat was tested for its potential to sorb malachite green (MG) and crystal violet (CV) from aqueous solutions. The pH edge experimental results indicated that biosorption of two cationic dyes increased with increase in pH and maximum biosorption obtained at pH 7. The Fourier transform infrared spectrometry confirmed the involvement of negatively charged groups in the removal of cationic dyes. Furthermore, the scanning electron micrographs were used to examine the surface morphology of coco-peat. The equilibrium isotherms determined at different pH conditions were described using two-parameter (Langmuir and Freundlich) and three-parameter (Sips and Redlich–Peterson) models. According to the Langmuir model, maximum dye uptakes of 276.8 and 119.2 mg/g were obtained for MG and CV, respectively. Biosorption kinetics were modelled using pseudo-first- and pseudo-second-order models, with the former described experimental data with high correlation coefficients and low % error values. Various thermodynamic parameters such as changes in Gibbs free energy, enthalpy and entropy were calculated; and results indicated that the present system was spontaneous and endothermic process.
- Subjects
MALACHITE; FOURIER transform infrared spectroscopy; CAUSTOBIOLITHS; MALACHITE green; FUNGICIDES
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 14, p6423
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1011709