Adsorptive removal of thorium (IV) using calcined and flux calcined diatomite from Turkey: Evaluation of equilibrium, kinetic and thermodynamic data

Yuşan, Sabriye; Gök, Cem; Erenturk, Sema; Aytaş, Şule

doi:10.1016/j.clay.2012.05.012

Cited by 81 publications

(31 citation statements)

References 56 publications

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“…The removal and addition of cations using aluminosilicates are dependent on ion exchange and adsorption mechanisms. Most recent works on the use of modified diatomaceous aluminosilicate as adsorbents are based on the removal of toxic metals from aqueous solutions at relatively low concentrations which may not always be the case in real situations (Linghu and Cui 2014;Knoerr et al 2013;Zhu et al 2012;Liu et al 2013;Irani et al 2011;Danil de Namor et al 2012;Yusan et al 2012;Sheng et al 2008Sheng et al , 2012Sprynskyy et al 2010;Pookmanee et al 2011). Also natural diatomites are contaminated with impurities, which impact negatively on their removal of heavy ions (Zhu et al 2012).…”

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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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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“…If value of E is between 1 and 8 kJ/mol, it indicates a physical adsorption. If value of E is higher than 8 kJ/mol, the adsorption process is of a chemical nature [18]. The E value of Eu adsorption obtained as 17.8 kJ/mol.…”

Section: B Adsorption Equilibrium and Isotherm Modelsmentioning

confidence: 99%

“…It means that the adsorption rates of europium are faster at low concentrations. The competition for the surface active sites of the adsorbent will be high at higher concentrations and after all lower sorption rates are obtained [9]- [18].…”

Section: Effect Of Contact Time and Kinetic Studiesmentioning

confidence: 99%

“…Gibbs free energy (ΔG°) was calculated for each working temperature by using Eq. (9) [18]. Distribution coefficient (K d , mL/g) is also computed using the following equation:…”

Section: Effect Of Temperature and Thermodynamic Studiesmentioning

confidence: 99%

“…Based on these results, adsorption of Eu was endothermic in nature. The increase in the amount of adsorbed europium at increased temperature might be due to the higher affinity of available active sites or the energy of the system facilitated europium sorption on the surface of the composite at high temperatures [18]- [19]. Thermodynamic parameters such as enthalpy change (ΔH°), entropy change (ΔS°) and free energy change (ΔG°) were estimated using the following equations.…”

Section: Effect Of Temperature and Thermodynamic Studiesmentioning

confidence: 99%

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Equilibrium, Kinetic and Thermodynamic Studies of Europium Adsorption by Biopolymeric Composite

Gök¹

2017

IJCEA

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Abstract-Biopolymers materials can be used for many applications in various areas. In this study, prepared magnetic alginate/hydroxyapatite biopolymeric composites were used for removal of europium from aqueous solution. In this respect, the physicochemical parameters of adsorption process are investigated for optimum uptake conditions. Sorption mechanisms will be investigated using experimental results and calculated parameters from some models as thermodynamic, isothermal and kinetic. The results suggest that these materials were proven to be potent material with chemical adsorption mechanism for reducing the concentration of europium with high efficiency in aqueous solution. Due to the high sorption capacity as 250.0 mg/g of the prepared material, plus its easy preparation process, economic advantage and environmental friendly nature would make these composites a promising removal and recovery agent for lanthanides.

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Adsorption isotherms, kinetic, and desorption studies on removal of toxic metal ions from aqueous solutions by polymeric adsorbent

Samadi

Hasanzadeh

Rasad

2014

J of Applied Polymer Sci

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Adsorption of Cd(II), Co(II), and Ni(II) on aminopyridine modified poly(styrene-alt-maleic anhydride) crosslinked by 1,2-diaminoethane as an ion exchange resin has been investigated in aqueous solution. Adsorption behavior of these metal ions on the resin was studied by varying the parameters such as pH (2-6), adsorbent dose (0-4.0 g/L), contact time (0-240 min), and metal ions concentration (20-300 mg/L). Adsorption percentage was increased by increasing each of these parameters. The isotherm models such as: Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich were used to describe adsorption equilibrium. The results showed that the best fit was achieved with the Langmuir isotherm equation, yielding maximum adsorption capacities of 81.30, 49.02, and 76.92 mg/g for Cd(II), Co(II), and Ni(II), respectively. The pseudo-first-order, pseudo-second-order, and intra-particle diffusion kinetics equations were used for modeling of adsorption data and it was shown that pseudo-second-order kinetic equation could best describe the adsorption kinetics. The intra-particle diffusion study revealed that external diffusion might be involved in this case.

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Adsorptive removal of thorium (IV) using calcined and flux calcined diatomite from Turkey: Evaluation of equilibrium, kinetic and thermodynamic data

Cited by 81 publications

References 56 publications

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

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

Equilibrium, Kinetic and Thermodynamic Studies of Europium Adsorption by Biopolymeric Composite

Adsorption isotherms, kinetic, and desorption studies on removal of toxic metal ions from aqueous solutions by polymeric adsorbent

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