Adsorption of chromium(VI) from aqueous solution by activated carbon derived from olive bagasse and applicability of different adsorption models

Demiral, Hakan; Demiral, İlknur; Tümsek, Fatma; Karabacakoğlu, Belgin

doi:10.1016/j.cej.2008.01.020

Cited by 318 publications

(172 citation statements)

References 31 publications

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“…The very important characteristic of the Langmuir isotherm can be expressed in terms of a dimensionless constant called the separation factor [6,16]:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Adsorption can be an effective method for the removal of chromium from aqueous solution, especially in combination with suitable regeneration steps, which resolves the problems associated with sludge disposal and makes the process more economically viable [6]. Previous studies on the removal of Cr(VI) using activated carbons produced from coconut shells [7], clays [8], wheat bran [9], rice husk [10], tyres and sawdust [11], etc.…”

Section: Introductionmentioning

confidence: 99%

“…However, these processes have some major drawbacks, which include incomplete metal removal, requirements for expensive equipment and monitoring system, high reagents and energy requirement and generation of toxic sludge with special disposal requirements, especially with the application of low cost adsorbents [6].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Oyedoh

Ekwonu

2016

Acta Polytech

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Abstract. The adsorption of chromium(VI) metal ion in aqueous solutions by activated carbon resorcinol formaldehyde xerogels (ACRF) was investigated. The results showed that pore structure, surface area and the adsorbent surface chemistry are important factors in the control of the adsorption of chromium(VI) metal ions. The isotherm parameters were obtained from plots of the isotherms and from the application of Langmuir and Freundlich Isotherms. Based on regression analysis, the Langmuir isotherm model was the best fit. The maximum adsorption capacity of ACRF for chromium (VI) was 241.9 mg/g. The pseudo-second-order kinetic model was the best fit to the experimental data for the adsorption of chromium metal ions by activated carbon resorcinol formaldehyde xerogels. The thermodynamics of Cr(VI) ions adsorption onto ACRF was a spontaneous and endothermic process.

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“…The very important characteristic of the Langmuir isotherm can be expressed in terms of a dimensionless constant called the separation factor [6,16]:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Oyedoh

Ekwonu

2016

Acta Polytech

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“…Conventional methods that include precipitation, ion-exchange, membrane filtration and reverse osmosis have been applied for the removal of pollutants from wastewaters. However, these processes involve high investment and they are energy intensive (Demiral et al 2008). The ever evolving and fast changing situation demands waste management mechanisms to be effective and economical.…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous carbon from date palm seeds and process optimization

Reddy

Shoaibi

Srinivasakannan

2014

Int. J. Environ. Sci. Technol.

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The agricultural wastes like date palm seeds to be a suitable precursor for the preparation of porous carbon has been explored in the present work, utilizing phosphoric acid as the activating agent. The experimental methods reported in literature were chosen with certain modification in order to simplify the process. The process optimization was performed using the popular response surface methodology adopting a Box-Behnken design. Process optimization was performed to maximize the porous carbon Brunauer-Emmett-Teller (BET) surface area and the methylene blue (MB) adsorption capacity, with the process variables being the activation temperature, impregnation ratio (IR) and the activation time. The textural characteristics were assessed based on nitrogen adsorption isotherms, scanning electron microscopy, while the adsorption capacity was estimated using the MB adsorption. The optimized experimental conditions were identified to be an activation temperature of 500°C, IR of 3.1 and activation time of 71.4 min, with the resultant porous carbon having BET surface area of 846.7 m 2 /g and MB adsorption capacity of 445.7 mg/g. The popular Langmuir and Freundlich adsorption isotherm models were tested, and a maximum monolayer adsorption capacity of the MB was estimated to be 345 mg/g, which compares with the highest of MB reported in literature, evidencing the suitability of the porous carbon for adsorption of macro-molecular compounds.

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“…In general, a wide range of processes have been reported to eliminate the Cr(VI) from water and wastewater such as chemical precipitation, electrochemical reduction, sulphide precipitation, cementation, ion-exchange, adsorption, reverse osmosis, elecrodialysis, solvent extraction and evaporation, etc. [10]. Among the different treatments described above adsorption technology is one of the most recommended physicochemical treatment processes, where the substance called adsorbate accumulates at the interface of solid called adsorbent [11,12].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) from Aqueous Solution onto a Mesoporous Carbonaceous Material Prepared from Naturally Occurring Pongamia pinnata Seeds

Kv¹,

BM²,

RS³

2015

J Environ Anal Toxicol

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Adsorption of chromium(VI) from aqueous solution by activated carbon derived from olive bagasse and applicability of different adsorption models

Cited by 318 publications

References 31 publications

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Preparation of porous carbon from date palm seeds and process optimization

Adsorption of Cr(VI) from Aqueous Solution onto a Mesoporous Carbonaceous Material Prepared from Naturally Occurring Pongamia pinnata Seeds

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