Use of Dyes for Specific Surface Measurement

Giles, C. H.; D'Silva, A. P.; Trivedi, Ankur

doi:10.1016/b978-0-408-70077-1.50033-6

Cited by 26 publications

(10 citation statements)

References 8 publications

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“…and the specific surface areas of chitosan in Table 3 were calculated, where N is Avogadro constant, δ is the average area occupied by a molecule of adsorbate in the completed monolayer (this value is 120 Å 2 for O-II and 225 Å 2 for CV), and n is the aggregation number (this value is 3 for O-II and CV) [11]. The negative H and larger C m constant at lower temperature confirmed that more O-II and CV are adsorbed by chitosan at lower temperature.…”

Section: Resultsmentioning

confidence: 99%

Kinetics and thermodynamics of the adsorption of some dyestuffs and p-nitrophenol by chitosan and MCM-chitosan from aqueous solution

Uzun

Güzel

2004

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

Kinetics and thermodynamics of the adsorption of some dyestuffs and p-nitrophenol by chitosan and MCM-chitosan from aqueous solution

Uzun

Güzel

2004

Journal of Colloid and Interface Science

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“…6) has a different format compared with the other materials. According to Giles et al [42], this isotherm (type represents a rare case, when, at high adsorbate concentrations, adsorbate-adsorbate interactions are favorable, and they increase rapidly in comparison with adsorbate-adsorbent interactions.…”

Section: Adsorption Isothermsmentioning

confidence: 98%

Preparation and evaluation of kinetics and thermodynamics studies of lead adsorption onto chemically modified banana peels

Massocatto

Paschoal

Buzinaro

et al. 2013

Desalination and Water Treatment

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A B S T R A C TThe use of alternative materials for environmental decontamination has been intensively studied. In this study, the capacity of banana peels treated with sodium hydroxide (NaOH), hydrochloric acid (HCl), and phosphoric acid (H 3 PO 4 ) to adsorb Pb (II) was evaluated. The physical and chemical changes on the banana peels after chemical treatment were evaluated by infrared spectroscopy and scanning electron microscopy. Batch adsorption experiments were carried out as a function of pH, time, metal concentration, and temperature; desorption tests were also performed. Pb (II) concentrations were determined by flame atomic absorption spectrometry. An increase in the adsorption capacity of the modified and natural peels was observed in the pH range of 3-5, and pH 5 was adopted for further experiments. The adsorption system reached equilibrium in 300 min, and its kinetics followed the pseudo-second-order equation. From adsorption isotherms, it was observed considerable enhance on adsorption capacity of banana peels, especially with treated with NaOH. Besides, the negative Gibbs free energy variation values showed that the Pb (II) adsorption was spontaneous. Moreover, the improvement in the Pb (II) desorption for the modified peels was observed, indicating that the proposed material can be reutilized.

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“…On the contrary, for the isotherms at 40°C and 50°C, it is observed that they are similar L-type isotherms according to the classification of Giles et al [38].…”

Section: Freundlich Isothermmentioning

confidence: 74%

“…It can be observed that the adsorption isotherm at 25°C could be classified as an H4-type isotherm according to the classification of Giles et al [38].…”

Section: Freundlich Isothermmentioning

confidence: 92%

Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

Andia

Yokoyama

Teixeira

2018

International Journal of Chemical Engineering

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In the present work, the equilibrium, thermodynamics, and kinetics of boron removal from aqueous solutions by the adsorption on commercial magnesium oxide powder were studied in a batch reactor. e adsorption efficiency of boron removal increases with temperature from 25°C to 50°C.e experimental results were fitted to the Langmuir, Freundlich, and Dubinin-Radushkevich (DR) adsorption isotherm models. e Freundlich model provided the best fitting, and the maximum monolayer adsorption capacity of MgO was 36.11 mg·g −1 . In addition, experimental kinetic data interpretations were attempted for the pseudo-first-order kinetic model and pseudo-second-order kinetic model. e results show that the pseudo-second-order kinetic model provides the best fit. Such result suggests that the adsorption process seems to occur in two stages due to the two straight slopes obtained through the application of the pseudo-first-order kinetic model, which is confirmed by the adjustment of the results to the pseudo-second-order model. e calculated activation energy (E a ) was 45.5 kJ·mol −1 , and the values calculated for ∆G°, ∆H°, and ∆S°were −4.16 kJ·mol 1 , 21.7 kJ·mol −1 , and 87.3 kJ·mol −1 , respectively. ese values confirm the spontaneous and endothermic nature of the adsorption process and indicated that the disorder increased at the solid-liquid interface. e results indicate that the controlling step of boron adsorption process on MgO is of a physical nature.

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Use of Dyes for Specific Surface Measurement

Cited by 26 publications

References 8 publications

Kinetics and thermodynamics of the adsorption of some dyestuffs and p-nitrophenol by chitosan and MCM-chitosan from aqueous solution

Kinetics and thermodynamics of the adsorption of some dyestuffs and p-nitrophenol by chitosan and MCM-chitosan from aqueous solution

Preparation and evaluation of kinetics and thermodynamics studies of lead adsorption onto chemically modified banana peels

Study of the Equilibrium, Kinetics, and Thermodynamics of Boron Removal from Waters with Commercial Magnesium Oxide

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