Kinetics and thermodynamics studies of chromium(VI) ions adsorption onto activated carbon from aqueous solutions

Barkat, M.; Nibou, Djamel; Chegrouche, Salah; Mellah, A.

doi:10.1016/j.cep.2007.10.004

Cited by 177 publications

(81 citation statements)

References 25 publications

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“…The maximum adsorption capacities observed at pH 5.81.0 (18.00mg/g).Adsorption values at pH greater than 6.9 gives rise to lead precipitation, so that active sites would have achieved saturation above a certain range of pH values. The results obtained are in close agreement with reported studies [19,21].…”

Section: Effect Of Phsupporting

confidence: 83%

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Preparation and Characterization of Activated Carbon from Palm Tree Leaves Impregnated with Zinc Chloride for the Removal of Lead (II) from Aqueous Solutions

Elhussien¹,

Hussein²,

Nimir³

et al. 2017

AJPC

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Abstract:Removal of Lead (II) from aqueous solution onto Activated carbon derived from Palm tree leaves (Phoenix dactylifera) as a novel precursor by chemical activation with ZnCl 2 , at specific condition of carbonization temperature at 500°C and 1 hour as a holding time and detonated as AC(PTL)ZnCl 2 . The obtained material was submitted to measurements of active surface area, Fourier Transform Infrared Spectroscopy (FTIR) analysis and scanning electron microscope (SEM). Batchadsorption studied had been carried out to examine the adsorption capacity of the AC(PTL)ZnCl 2 for the removal of Lead (II) from aqueous solution. The effect of various process parameters like pH, initial metal concentration, adsorbent dose, contact time, and temperature on the efficiency of Pb (II) removal was investigated. Maximum adsorption of Pb (II) on AC(PTL)ZnCl 2 (86.4%) was observed at pH 5.81. The optimum conditions for adsorbent dose and temperature were determined as 0.030 g and 25°C, respectively. Initial Pb (II) concentrations has important effect on AC(PTL)ZnCl 2 in the studied range (25-125 mg/L) where the removal percentage increases as the metal ion decrease. The highest percentage removal of concentration corresponding to the maximum adsorption was found to be 82.75 ± 3.65. The adsorption equilibrium data was well explained by Langmuir, Freundlich and Dubinin-Radushkevich isotherm. The parameters suggested that the adsorption of Pb (II) on prepared AC(PTL)ZnCl 2 is physical adsorption. The Langmuir isotherm which fitted best for the experimental data obtained showed (Correlation Coefficient, R 2 = 0.9463) higher than the (Freundlich isotherm, R 2 = 0.7554), but more close to (Dubinin-Radushkevich isotherm, R 2 = 0.9260). The porous characteristics and adsorption efficiencies of prepared AC(PTL)ZnCl 2 were also investigated.

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Section: Effect Of Phsupporting

confidence: 83%

“…Later on, when the pH precede toward basic region and elevated above 5.81, the recorded values of removal ions increase significantly specially at 7 and 9 pH to record higher values. This is attributed to Pb (II) ions precipitated regarding to the formation of lead hydroxide anions due to the dissolution of Pb(OH) 2 as a result [18,21]. …”

Section: Effect Of Phmentioning

confidence: 99%

Preparation and Characterization of Activated Carbon from Palm Tree Leaves Impregnated with Zinc Chloride for the Removal of Lead (II) from Aqueous Solutions

Elhussien¹,

Hussein²,

Nimir³

et al. 2017

AJPC

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“…The ther modynamic parameters of adsorption process can be determined from the variation of thermodynamic equilibrium constant, K o [22][23][24] .Where Ko is defined as follow: …”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Method for The Removal of Piumbum(II) Ion from Aqueous Solutions by Corn Cobas A Natural Adsorbent and from The View Point Thermodynamics

Haghdoost¹

2016

Orient. J. Chem

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Corn cob as a low-cost adsorbent were used in the present work for the removal of toxic heavy metal Pb 2+ from aqueous solutions. Bath experiments were used to determine the best adsorption conditions. The equilibrium adsorption level was determined as a function of solution pH, temperature(T), contact time(tc), initial adsorbate concentration, and adsorbent dosage. Effective removal of metal ions was demonstrated at pH values of 6. Metal adsorption onto Corn cob was evaluated by Langmuir and Freundlich isotherms. Results indicate that the Langmuir isotherm model is the most suitable one for the adsorption process using Corn cob(R 2 =0.9742), thus indicating the applicability of monolayer coverage of Pb(II) ion on Corn cob surface.The relationship between thermodynamic parameters was used to predict the absorption process. According to Thermodynamic analysis, the process endothermic and natural (∆H o =-16. ).

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“…Large amount of effluent laden with toxic heavy metals from industries is discharged into the environment posing threat to public health due to their toxic and persistent nature.High concentrations of chromium are found in wastewater released from the chemical industries especially electroplating and leather tanning industries [1]. Othersources include pigment, paper, paints, steel fabrication, mining and textile dyeing industries.…”

Section: …………………………………………………………………………………………………… Introduction:-mentioning

confidence: 99%

Kinetic Studies of Adsorption Process of Chromium Ions From Aqueous Solution.

Lakherwal¹,

Singh²,

Rattan³

2016

IJAR

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The adsorption efficiency of granular activated carbon was investigated for removal of Cr(VI) ions in a lab scale fluidised bed reactor. The effect of various parameters like pH, contact time and initial metal ion concentration on adsorption process were investigated. More adsorption was observed at lower pH and optimum pH was found to be 3.0.The equilibrium time was observed at 420 min. With the increase in initial Cr(VI) ion concentration, the percentage adsorption decreases while the adsorption capacity (q e ) increases. Maximum adsorption of 96.02 % and 63.28 % was found at concentration of 10 mg/L and 50 mg/L respectively. The kinetic study was performed using pseudo-first and pseudo-second order kinetic model. The process of adsorption of Cr(VI) ions was found to follow pseudo-second order kinetic model. …………………………………………………………………………………………………….... Introduction:-Environmental pollution in water bodies is due to the enormous quantity and variety of chemical compounds found in the industrial wastewaters. Large amount of effluent laden with toxic heavy metals from industries is discharged into the environment posing threat to public health due to their toxic and persistent nature.High concentrations of chromium are found in wastewater released from the chemical industries especially electroplating and leather tanning industries [1]. Othersources include pigment, paper, paints, steel fabrication, mining and textile dyeing industries. Chromium salts also found their use in wood preservatives and ceramic, fungicides and rubber manufacturing [2]. In aqueous phase chromium exists in two forms: trivalent and hexavalent. Cr(III) is required for nutrition but upto a certain limit only. However, Cr(VI) is toxic and is found to be carcinogenic. The tolerance limit for Cr(VI) in potable water is 0.05 mg/L. For releasing the hexavalent chromium into the inland waters, the tolerance limit is 0.1 mg/L. The safe limit for chromium containing effluent discharge into the surface water is also 0.1 mg/L as set by the Ministry of Environment and Forest [MoEF] [3]. According to EPA, chromium inhalation causes shortening of breath, asthmatic problems, wheezing and nose and throat irritation. Continuous exposure leads to bleeding of stomach and intestine and circulatory, kidney and liver damage. Skin contact causes skin allergy, ulcers and skin irritation [4]. Ion exchange, Reverse osmosis, Chemical reduction, Electrolysis, Precipitation, Flocculation, Coagulation andNano-filtration are the most popular conventional methods used for the removal of chromium ions from the industrial wastewater. Most of the processes have one or more drawbacks and they cannot be used for removing lower concentrations of heavy metal ions. It is challenging task for the environment scientists and engineers to develop new technologies for removing heavy metals which are effective and economic [5]. Adsorption process is efficient in removing very low concentrations of metal ions and is considered more effective

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Kinetics and thermodynamics studies of chromium(VI) ions adsorption onto activated carbon from aqueous solutions

Cited by 177 publications

References 25 publications

Preparation and Characterization of Activated Carbon from Palm Tree Leaves Impregnated with Zinc Chloride for the Removal of Lead (II) from Aqueous Solutions

Preparation and Characterization of Activated Carbon from Palm Tree Leaves Impregnated with Zinc Chloride for the Removal of Lead (II) from Aqueous Solutions

Method for The Removal of Piumbum(II) Ion from Aqueous Solutions by Corn Cobas A Natural Adsorbent and from The View Point Thermodynamics

Kinetic Studies of Adsorption Process of Chromium Ions From Aqueous Solution.

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