Preparation of char from lotus seed biomass and the exploration of its dye removal capacity through batch and column adsorption studies

Nethaji, S and Sivasamy, A and Kumar, Vimal R and Mandal, A B (2012) Preparation of char from lotus seed biomass and the exploration of its dye removal capacity through batch and column adsorption studies. Environmental Science and Pollution Research. ISSN 0944-1344

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Abstract

Char was obtained from lotus seed biomass by a simple single-step acid treatment process. It was used as an adsorbent for the removal of malachite green dye (MG) from simulated dye bath effluent. The adsorbent was characterized for its surface morphology, surface functionalities, and zero point charge. Batch studies were carried out by varying the parameters such as initial aqueous pH, adsorbent dosage, adsorbent particle size, and initial adsorbate concentration. Langmuir and Freundlich isotherms were used to test the isotherm data and the Freundlich isotherm best fitted the data. Thermodynamic studies were carried out and the thermodynamic parameters such as ΔG, ΔH, and ΔS were evaluated. Adsorption kinetics was carried out and the data were tested with pseudofirst-order model, pseudosecondorder model, and intraparticle diffusion model. Adsorption of MG was not solely by intraparticle diffusion but film diffusion also played a major role. Continuous column experiments were also conducted using microcolumn and the spent adsorbent was regenerated using ethanol and was repeatedly used for three cycles in the column to determine the reusability of the regenerated adsorbent. The column data were modeled with the modeling equations such as Adam-Bohart model, Bed Depth Service Time (BDST) model, and Yoon-Nelson model for all the three cycles.

Item Type: Article
Uncontrolled Keywords: Char . Lotus seed . Isotherms . Kinetics . Thermodynamics . Column regeneration
Subjects: Engineering > MIT Manipal > Chemical
Depositing User: MIT Library
Date Deposited: 08 Oct 2015 11:46
Last Modified: 08 Oct 2015 11:46
URI: http://eprints.manipal.edu/id/eprint/144354

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