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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 7, 2015, pp. 2273-2284
Bioline Code: st15214
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 7, 2015, pp. 2273-2284

 en Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis check for this species in other resources
Aysu, T. & Ku¨c¸u¨k, M. M.

Abstract

Ferula orientalis check for this species in other resources L. stalks were used as an agricultural solid biomass waste for preparation of activated carbon with zinc chloride activation using slow pyrolysis in a fixed-bed reactor. The chemical characteristics of the activated carbon obtained at 550 °C were identified by elemental, fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, scanning electron microscopy analyses and found to have a surface area of 1,476 m2/g. The ability of the activated carbon to adsorb methylene blue and crystal violet from aqueous solutions has been investigated. Adsorption studies were performed at different initial dye concentrations (200–800 ppm), contact time (0.5–90 min) and temperature (25–45 °C). Adsorption data were modeled with Langmuir, Freundlich and Temkin adsorption isotherms. Equilibrium data of the adsorption processes showed that adsorption of methylene blue is fitted to the Langmuir and crystal violet to the Freundlich isotherm. Pseudo-first-order, pseudo-secondorder and Elovich kinetic models were used to analyze the kinetic data obtained at different initial dye concentrations. The adsorption kinetic data were very well described by the pseudo-second-order model. The calculated thermodynamic parameters such as change in free energy, enthalpy and entropy showed that adsorptions of both dyes onto activated carbon were spontaneous and endothermic under the experimental conditions.

Keywords
Activated carbon; Chemical activation; Crystal violet; Methylene blue; Ferula orientalis L.

 
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