Last modified: 2016-11-30
Abstract
This work will address the feasibility of adsorption of Rhodamine-B from aqueous solutions using acid treated lawny grass. The synthesized adsorbent was characterized by FTIR (Fourier Transform Infrared), TGA (Thermo gravimetric Analysis) and SEM (Scanning Electron Microscopy) to analyze the attachment of surface functional groups, thermal stability of the adsorbent and the surface morphology, respectively. Batch adsorption experiments were carried out as a function of contact time, initial concentration of the adsorbate, adsorbent dosage and temperature. The contact time to achieve equilibrium was found to be 135min utilizing the optimum dosage of an adsorbent. The kinetics of an adsorption was analyzed by fitting the data to pseudo first and second order models. The calculated thermodynamic parameters demonstrate the spontaneous and endothermic behavior of Rhodamine-B adsorption on treated grass. The isothermal runs were carried out by varying the initial concentration from 10 to 2000 mg/L to test the applicability of Langmuir, Freundlich and Sip’s models. The results showed that the treated grass can be employed as an alternative to commercial adsorbents in for the removal of dyes from aqueous solution and waste water.
References
A. S. Rangabhashiyam, "Sequestration of dye from," Journal of Environmental Chemical Engineering, vol. 1, no. 4, p. 629–641, 2013.
C. S. N. K. A. Indra Deo Mall, "Adsorptive removal of malachite green dye from aqueous solution by bagasse fly ash and activated carbon-kinetic study and equilibrium isotherm analyses," Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 264, no. 1-3, p. 17–28, 2005.
B. A. E. Eren, "Investigation of a basic dye adsorption from aqueous solution onto raw and pre-treated sepiolite surfaces," Dyes and Pigments, vol. 73, no. 2, p. 162–167, 2007.