Removal of basic dyes from aqueous solution by adsorption onto binary iron-manganese oxide coated kaolinite: Non-linear isotherm and kinetics modeling

Khan, Tabrez Alam; Khan, Equbal A.; Shahjahan, Md

doi:10.1016/j.clay.2015.01.005

Cited by 187 publications

(76 citation statements)

References 38 publications

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“…The pseudo-first order equation assumes the adsorption of one MB molecule onto one active site on the porous biochar surface, while in pseudo-second order model one MB molecule is adsorbed onto two active site (Khan et al 2015). It was clear that the adsorption process for porous biochar was rapid at the beginning, and then increased slowly until the plateau of adsorption equilibrium was achieved.…”

Section: Adsorption Kineticsmentioning

confidence: 87%

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Han¹,

Chu²,

Liu³

et al. 2015

BioResources

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aBiochar from peanut shell was used as the precursor for the preparation of porous biochar by KOH activation. The pore structures of porous biochar also were characterized by scanning electron microscopy (SEM) and N2 adsorption/desorption. The adsorption performance for the removal of methylene blue (MB) was deeply investigated. The effects of impregnation ratio (KOH/biochar: w/w), activation temperature, and activation time on the removal of methylene blue by porous biochar were evaluated. In addition, the effects of initial MB concentration and pH value on the adsorption process were also studied. The optimum conditions for preparing porous biochar were obtained with 1.5:1 of impregnation ratio, 800 °C of activation temperature, and 90 min of the holding time in activation. Results indicated that the adsorption capacity was high even at higher initial MB concentrations. The adsorption process followed pseudosecond-order kinetics. The experimental adsorption isotherm was found to be best fitted with the Langmuir model, which implying that the adsorption of MB by porous biochar proceeded as a monolayer adsorption, and the maximum monolayer adsorption capacity of MB was 208 mg•g -1 .

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Section: Adsorption Kineticsmentioning

confidence: 87%

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Han¹,

Chu²,

Liu³

et al. 2015

BioResources

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“…With the additional value of being inexpensive and readily available, natural clay aluminosilicate possesses unique combination of physical and chemical properties which makes it suitable for a wide range of industrial applications (Wu et al 2005;De Castro Dantas et al 2001;Irani et al 2011;Khan et al 2015;Jiang et al 2010;Gupta 2006, 2008a, b;Gupta and Bhattacharyya 2008;Karaoglu et al 2010). However, it is important to increase its adsorptive capacity of natural adsorbent to meet wider range of challenges; this is usually achieved by increasing the number of chemically active sites or enlarging its surface area.…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

2017

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Photocatalytically modified ceramic adsorbents were synthesized for the removal of high concentration Cu (II) and Co (II) ions from their aqueous solutions. The raw material, diatomaceous aluminosilicate mineral was modified using silver and anatase titanium oxide nanoparticles. Batch adsorption experiment was carried out on the targeted metal ions and the results were analyzed by the Langmuir and Freundlich equation at different concentrations (100-1000 mg/l) and the characteristic parameters for each adsorption isotherm were determined. As-received raw materials do not exhibit any sorption capacity for high concentration Cu 2? and Co 2? adsorbates. However, the adsorption isotherms for modified diatomaceous ceramic adsorbents could be fitted well by the Langmuir model for both Cu 2? and Co 2? with correlation coefficient (R) of up to 0.99953. The highest and lowest monolayer coverage (q max ) were 121.803 and 31.289 mg/g for Cu 2? and Co 2? , respectively. The separation factor (R L ) in the experiment was less than one (\1), indicating that the adsorption of metal ions on the Ag-TiO 2 -modified ceramic adsorbent is favorable. The highest adsorption capacity (K f ) and intensity (n) constants obtained from Freundlich model are 38.832 (Cu 2? on ZEO-T) and 5.801 (Co 2? on STOX-Z).

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“…Then, sorption of Zn(II) on OMD may be considered as a chemisorption. This model considers as well that one adsorbate molecule is adsorbed onto two active sites 26 . Adsorption of Zn 2+ has followed as well this kinetic behavior for sorbents like calcinated loess 27 and an amorphous hydrous manganese oxide 16 .…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Zn²⁺ from solutions on manganese oxide obtained via ozone precipitation reaction

Contreras-Bustos

Espejel‐Ayala

Cercado

et al. 2016

Polish Journal of Chemical Technology

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Synthesis via ozone precipitation reaction was used to obtain manganese dioxide (OMD) and it was probed as an adsorbent for zinc ions. Adsorption was followed along shaking time and increasing ratio ] / [Zn 2+ ], and isotherms were obtained at different pH values and in the presence of several anions (chloride, nitrate, sulphate, and acetate). It was found that adsorption equilibrium is fast and follows the pseudo-second order model (q e = 34 ±1 mg/g and K = 0.07 ±0.01 g/mg h). Isotherms were fi tted to Langmuir, Freundlich, and LangmuirFreundlich models, and the best fi tting was found with the last one. The process is dependent on pH and the effi ciency increases from pH 1 to 4. The ratio [NO 3 -] / [Zn 2+ ] up to 3 does not seem to change the behaviour of the process. Regarding the anions, the effi ciency of Zn(II) adsorption occurs according to: acetate > nitrate and sulphate > chloride. Manganese oxide obtained via ozonization is an excellent adsorbent for zinc ions.

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Removal of basic dyes from aqueous solution by adsorption onto binary iron-manganese oxide coated kaolinite: Non-linear isotherm and kinetics modeling

Cited by 187 publications

References 38 publications

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Adsorption of Zn²⁺ from solutions on manganese oxide obtained via ozone precipitation reaction

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Removal of basic dyes from aqueous solution by adsorption onto binary iron-manganese oxide coated kaolinite: Non-linear isotherm and kinetics modeling

Cited by 187 publications

References 38 publications

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Removal of Methylene Blue from Aqueous Solution using Porous Biochar Obtained by KOH Activation of Peanut Shell Biochar

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Adsorption of Zn2+ from solutions on manganese oxide obtained via ozone precipitation reaction

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Adsorption of Zn²⁺ from solutions on manganese oxide obtained via ozone precipitation reaction