Organofunctionalized Amazon smectite for dye removal from aqueous medium—Kinetic and thermodynamic adsorption investigations

Guerra, Denis L.; Silva, Weber L.L.; Oliveira, Hellen Cristine Prata de; Viana, Rúbia Ribeiro; Airoldi, Cláudio

doi:10.1016/j.jhazmat.2010.11.054

Cited by 9 publications

(2 citation statements)

References 32 publications

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“…The time-course profile of the adsorbed amount of caffein is shown in Figure S8. Governed by pseudo-second-order kinetics, the adsorption equilibrium was reached after ∼3 h. − The pseudo-second-order model has been fitted to the kinetic data of diverse systems involving (ad)sorption on 2D materials. − From the time-course profile we calculated the effective diffusion coefficient D = 2 x 2 / t f , where x is the thickness (size) of the adsorbents and t f is the completion time of the adsorption. Although the D of caffeine intercalation was not precisely determined, its order of magnitude was estimated as 10 –12 m 2 /s referring to intercalation of an organic molecule into a hydrated smectite with x = 65 ± 20 μm .…”

Section: Resultsmentioning

confidence: 99%

Important Roles of Water Clusters Confined in a Nanospace as Revealed by a Synchrotron X-ray Diffraction Study

Okada¹,

Izumi²,

Kawaguchi

et al. 2021

Langmuir

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States of water molecules confined in a nanospace designed by montmorillonite (negatively charged silicate layer) and charge compensating benzylammonium were investigated. Caffeine was used as a probe because of its compatibility for the fine structure of the interlayer water. Powder synchrotron radiation X-ray diffraction (SXRD) and adsorption isotherms of the water vapor revealed a metastable structure of bimolecular water layers (2WLs) in the interlayer space. Water molecules readily penetrated to expand the interlayer space to 0.56 nm. The interlayer space did not increase further even in the presence of excess water. According to the isosteric heat of water, the expansion was limited because of moderate hydration as forming 2WLs. Caffeine molecules replaced a part of the water molecules in the 2WLs to expand the interlayer space to 0.65 nm. Time-resolved SXRD with an accumulation time of 500 ms revealed that the interlayer expansion reached a steady state within a few minutes. The caffeine intercalation proceeded, involving a change in the molecular orientation that increased the contact area of the caffeine molecules. The interlayer expansion was limited in all the solvents examined (mixtures of water with methanol, ethanol, acetone, and tetrahydrofuran), while the packing density of the incorporated caffeine was maximized in the absence of an organic solvent. The water molecules confined in the interlayer space acted as an actuator to accommodate a large quantity of amphiphilic molecules by adapting the nanostructure, which was achieved by releasing the confined water molecules.

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Section: Resultsmentioning

confidence: 99%

Important Roles of Water Clusters Confined in a Nanospace as Revealed by a Synchrotron X-ray Diffraction Study

Okada¹,

Izumi²,

Kawaguchi

et al. 2021

Langmuir

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“…These results may be explained by the increase of the mobility of large dye molecules depending on the temperature and the subsequent interacting of these molecules with adsorption sites. Moreover, the alteration of temperature up to 328 K may induce a swelling effect within the internal structure of the fish bone enabling the same molecules to penetrate further [50][51][52]. …”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Optimization, kinetics, equilibrium, and thermodynamic investigation of cationic dye adsorption on the fish bone

Ebrahimi

Pajootan

Arami

et al. 2015

Desalination and Water Treatment

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The present study evaluates the thermodynamic, kinetic, and isotherm parameters of the adsorption of two cationic dyes as well as the optimization of their removal process using fish bone as the adsorbent. The determination of isoelectric pH (pH ZPC ) of the adsorbent demonstrated that the surface of the fish bone was negatively charged at high pH values, which could adsorb cationic dye molecules. The Langmuir, Freundlich, and Tempkin adsorption isotherms were investigated and the results showed that the removal of both dyes followed Tempkin isotherm. Adsorption kinetic studies indicated that the dye removal conformed to pseudo-second-order kinetic model; and calculation of the thermodynamic parameters revealed that the adsorption process was spontaneous (ΔG < 0) and endothermic (ΔH > 0). Also, the response surface methodology was employed for the design of experiments in binary systems using the mixture of both dyes; and the effect of operating parameters (pH, initial dye concentration, adsorbent dosage, and time) was investigated and the removal process was optimized. Eventually, the results indicated that the fish bone can be used as a proper adsorbent for the removal of cationic dyes from multi-component colored wastewaters.

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Preparation of the cotton fabric with ultraviolet resistance and antibacterial activity using nano attapulgite colloidal particles

Lee

Wang

2012

Fibers Polym

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Organofunctionalized Amazon smectite for dye removal from aqueous medium—Kinetic and thermodynamic adsorption investigations

Cited by 9 publications

References 32 publications

Important Roles of Water Clusters Confined in a Nanospace as Revealed by a Synchrotron X-ray Diffraction Study

Important Roles of Water Clusters Confined in a Nanospace as Revealed by a Synchrotron X-ray Diffraction Study

Optimization, kinetics, equilibrium, and thermodynamic investigation of cationic dye adsorption on the fish bone

Preparation of the cotton fabric with ultraviolet resistance and antibacterial activity using nano attapulgite colloidal particles

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