An investigation of the kinetics and thermodynamics of the adsorption of a cationic cobalt porphyrazine onto sepiolite

Sevim, Altuğ Mert; Hojiyev, Rustam; Gül, Ahmet; Çelik, M. S.

doi:10.1016/j.dyepig.2010.04.011

Cited by 67 publications

(26 citation statements)

References 52 publications

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“…As can be seen from Table 5, the adsorption process was endothermic (ΔH°N 0) which was attributed unequivocally to chemisorptions [70][71][72], and this may be explained with a chemical reaction between the surface OH-groups of SiO 2 and the Mn(II) ions, for example:…”

Section: Adsorption Thermodynamicsmentioning

confidence: 95%

Thermodynamics and kinetics of the removal of manganese(II) ions from aqueous solutions by white rice husk ash

Tavlieva

Genieva

Georgieva

et al. 2015

Journal of Molecular Liquids

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Section: Adsorption Thermodynamicsmentioning

confidence: 95%

Thermodynamics and kinetics of the removal of manganese(II) ions from aqueous solutions by white rice husk ash

Tavlieva

Genieva

Georgieva

et al. 2015

Journal of Molecular Liquids

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“…The positive value of H indicates that the adsorption process is endothermic, while the positive values of S implied the increased randomness at the solid/liquid interface during Pb 2+ adsorption on the CS [50]. A positive value of S also indicated that there is an increase in the degree of freedom of the adsorbed species [46][47][48][49].…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

“…The negative values of G indicated spontaneity and feasibility of the Pb 2+ adsorption on the CS. The decrease of G with an increase of temperature suggests that adsorption process is more energetically favorable at higher temperatures [46][47][48][49]. Also, the increase of G with an increase in Pb 2+ concentration suggests that the adsorption process is more favorable at lower concentrations.…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

Removal of Pb2+ ions by raw corn silk (Zea mays L.) as a novel biosorbent

Petrović

Šoštarić

Stojanović

et al. 2016

Journal of the Taiwan Institute of Chemical Engineers

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“…In recent years, more and more researchers applied non-conventional low-cost adsorbents to remove the various dyestuffs from an aqueous solution. Some of these are as follows: waste materials [18], fruit peels [19], Portland cement [20], Tripoli [21], date stones and palm-trees [22], pomegranate peel [23], fly ash [24,25], betonies [26], princess tree leaf [27], sepiolite [28], kaolin [29,30], etc.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Removal of acid turquoise blue 2G from aqueous solution by adsorbent derived from sludge and straw: kinetic, isotherm and thermodynamic study

Ren

Lai

Zhu

et al. 2014

Desalination and Water Treatment

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He (2014): Removal of acid turquoise blue 2G from aqueous solution by adsorbent derived from sludge and straw: kinetic, isotherm and thermodynamic study, Desalination and Water Treatment,The main objective of this work was to evaluate the adsorption capacity of acid turquoise 2G onto the adsorbent derived from sludge and straw. The sludge-straw adsorbent was prepared by pyrolysis in a dried state. The BET surface area of the adsorbent was 459.77 m 2 ·g −1 , micropore volume was 0.164 cm 3 ·g −1 , and average pore radius was 3.345 nm. The experimental data were analyzed using four adsorption kinetic models (pseudo-first-order, pseudo-second-order, intra-particle diffusion, and elovich) and related parameters were calculated. The results showed pseudo-second-order kinetic model was better fitted with experimental data than the others; the pseudo-second-order adsorption mechanism was predominant for the adsorption of acid turquoise 2G. Adsorption equilibrium was analyzed by Langmuir and Freundlich models. Langmuir isotherm was found to be more suitable than Freundlich isotherm for correlation of equilibrium data. The maximum amount of acid turquoise blue 2G adsorbed (q m ) was 1.215, 1.413, and 1.574 mmol·g −1 at 288, 298, and 308 K, respectively. Free energy of adsorption (ΔG 0 ), enthalpy change (ΔH 0 ), and entropy change (ΔS 0 ) were calculated, and the results indicated that the adsorption processes of acid turquoise blue 2G on the sludge-straw adsorbent were spontaneous (ΔG 0 < 0), endothermic in nature (ΔH 0 > 0), and accompanied by an increase in entropy change (ΔS 0 > 0).

show abstract

An investigation of the kinetics and thermodynamics of the adsorption of a cationic cobalt porphyrazine onto sepiolite

Cited by 67 publications

References 52 publications

Thermodynamics and kinetics of the removal of manganese(II) ions from aqueous solutions by white rice husk ash

Thermodynamics and kinetics of the removal of manganese(II) ions from aqueous solutions by white rice husk ash

Removal of Pb2+ ions by raw corn silk (Zea mays L.) as a novel biosorbent

Removal of acid turquoise blue 2G from aqueous solution by adsorbent derived from sludge and straw: kinetic, isotherm and thermodynamic study

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