Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk

Igwe, J. C.; Abia, A. A.

doi:10.2225/vol10-issue4-fulltext-15

Cited by 80 publications

(79 citation statements)

References 23 publications

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“…Bioadsorbents may be represented by organic materials such as fungi [1], algae [2], sawdust [3,4], rice hulls [5], peat [6], corn [7], wheat bran [8], sunflower seeds [9], chopped straw, sawdust, and nut or coffee shells and many others.…”

Section: Introductionmentioning

confidence: 99%

Fractional Derivatives for Description of Sorption Kinetics in the Plant Sorbent - Metal Ions System

Tomczak¹,

Kamiński²,

Szczerkowska³

2013

Ecological Chemistry and Engineering S

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Abstract:It was examined if buckwheat hull has a potential to be used to adsorb heavy metal ions Zn(II), Cd(II), Co(II), Cu(II), Ni(II) from water. The research involved experiments aimed at the determination of sorption kinetics taking into consideration changes of concentration in a solution and sorbent over time. According to the literature data, kinetics is described with the use of pseudo first-order equations. Application of fractional derivatives for the description of sorption kinetics enables the development of the generalised sorption kinetics equation. Result analysis with this concept requires making a computational procedure using gamma functions and infinite series. Kinetics description using fractional derivatives will be equations with two parameters ie fraction of derivative α and the kinetics constant K dependent on the analysed sorbent-adsorbate system.

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Section: Introductionmentioning

confidence: 99%

Fractional Derivatives for Description of Sorption Kinetics in the Plant Sorbent - Metal Ions System

Tomczak¹,

Kamiński²,

Szczerkowska³

2013

Ecological Chemistry and Engineering S

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“…The value of 1/n \ 1, for both metal ions implied favorable adsorption. The magnitude of K f is a measure of the adsorbate on the adsorbent (Jalali et al 2002;Igwe and Abia 2007). In this study, the sorption intensity on Mn(II) is higher than that of Fe(II).…”

Section: Adsorption Isothermsmentioning

confidence: 74%

Thermodynamic and kinetic studies of biosorption of iron and manganese from aqueous medium using rice husk ash

2014

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The adsorption behavior of rice husk ash with respect to manganese and iron has been studied by batch methods to consider its application for water and waste water treatment. The optimum conditions of adsorption were determined by investigating the effect of initial metal ion concentration, contact time, adsorbent dose, pH value of aqueous solution and temperature. Adsorption equilibrium time was observed at 120 min. The adsorption efficiencies were found to be pH dependent. The equilibrium adsorption experimental data were found to fit the Langmuir, Freundlich and Temkin isotherms for iron, but fitted only Langmuir isotherm for manganese. The pseudosecond order kinetic model was found to describe the manganese and iron kinetics more effectively. The thermodynamic experiment revealed that the adsorption processes involving both metals were exothermic. The adsorbent was finally applied to typical raw water with initial manganese and iron concentrations of 3.38 mg/l for Fe and 6.28 mg/l, respectively, and the removal efficiency was 100 % for Mn and 70 % for Fe. The metal ions were desorbed from the adsorbent using 0.01 M HCl, it was found to quantitatively remove 67 and 86 % of Mn and Fe, respectively, within 2 h. The results revealed that manganese and iron are considerably adsorbed on the adsorbent and could be an economic method for the removal of these metals from aqueous solutions.

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“…The magnitude of n gives an indication on the favorability of adsorption. It is generally stated that the values of n in the range 2 -10 represent good, 1 -2 moderately good, and less than 1 poor adsorption characteristics [31]. The Freundlich isotherm is an empirical equation based on an exponential distribution of adsorption sites and energies.…”

Section: Langmuir Isothermmentioning

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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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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Equilibrium sorption isotherm studies of Cd(II), Pb(II) and Zn(II) ions detoxification from waste water using unmodified and EDTA-modified maize husk

Cited by 80 publications

References 23 publications

Fractional Derivatives for Description of Sorption Kinetics in the Plant Sorbent - Metal Ions System

Fractional Derivatives for Description of Sorption Kinetics in the Plant Sorbent - Metal Ions System

Thermodynamic and kinetic studies of biosorption of iron and manganese from aqueous medium using rice husk ash

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

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