Adsorption of methylene blue on activated carbon produced from flamboyant pods (Delonix regia): Study of adsorption isotherms and kinetic models

Vargas, Alexandro M.M.; Cazetta, André L.; Kunita, Marcos H.; Silva, Taís L.; Almeida, Vitor C.

doi:10.1016/j.cej.2011.01.067

Cited by 463 publications

(210 citation statements)

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“…The parameters obtained from the different models provide important information on the sorption mechanisms and the surface properties and affinities of the adsorbent (Vargas et al 2011). The adsorption isotherms show how the molecules distribute between the liquid and solid phases when the process reaches the equilibrium state.…”

Section: Experimental Procedures and Adsorption Isothermsmentioning

confidence: 99%

“…The kinetic adsorption data can be processed to understand the dynamics of the adsorption reactions in terms of the order of the rate constant since the kinetics parameters provide important information for designing and modeling the adsorption process (Vargas et al 2011). The study of adsorption kinetics describes the solute uptake rate which controls the residence time of adsorbate uptake at the solid-solution interface (El-Sayed 2011).…”

Section: Kinetic Data Analysismentioning

confidence: 99%

“…Activated carbon is used most widely in adsorption processes as it can be produced both from renewable and non-renewable resources with low cost (Tay et al 2012). The low-cost activated carbons obtained from renewable agricultural wastes, and by-products so far include flamboyant pods (Vargas et al 2011), soybean oil cake (Tay et al 2012), cashew nut shell (Kumar et al 2011), Posidonia oceanic leaves (Dural et al 2011), date pits , bamboo (Hameed et al 2007), oil palm wood ), sour cherry stones (Angın 2014), date stones , Jatropha curcas fruit shell (Tongpoothorn et al 2011), rise husks (Yalçın and Sevinç 2000), peach stones (Attia et al 2008) and orange peel (Khaled et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…As most of these organic dyes in wastewaters are very harmful and toxic to living aquatic organisms such as fish, removal of them has become very crucial in terms of environmental concerns in recent years (Weng and Pan 2007;Vargas et al 2011). There are several removing methods of dyestuffs from wastewaters such as oxidation, coagulation, adsorption, membrane and biological processes.…”

Section: Introductionmentioning

confidence: 99%

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Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Aysu

Küçük

2014

Int. J. Environ. Sci. Technol.

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Ferula orientalis 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 m 2 /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.

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Section: Experimental Procedures and Adsorption Isothermsmentioning

confidence: 99%

Section: Kinetic Data Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal of crystal violet and methylene blue from aqueous solutions by activated carbon prepared from Ferula orientalis

Aysu

Küçük

2014

Int. J. Environ. Sci. Technol.

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show abstract

“…For the adsorption of methylene blue on activated carbon, the equilibrium was found to achieve within 30 min [16]. For the adsorption of neutral red by Fe 3 O 4 hollow nanospheres, 1 h was needed to reach equilibrium [17].…”

Section: Adsorption Equilibrium Timementioning

confidence: 99%