Removal of cationic dyes from aqueous solutions by kaolin: Kinetic and equilibrium studies

Nandi, Barun Kumar; Goswami, A.; Purkait, Mihir Kumar

doi:10.1016/j.clay.2008.03.015

Cited by 438 publications

(170 citation statements)

References 24 publications

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“…Due to the low-cost and large availability, the use of clays like kaolin becomes the adsorption process an attractive and promising technology. Although there are several works in literature reporting the removal of different classes of dyes onto kaolin [41][42][43][44] , no studies were found reporting the application of a natural kaolin sample from the Rio Grande do Sul State (Brazil) for the removal of Malachite Green dye.…”

Section: Introductionmentioning

confidence: 99%

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

et al. 2017

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This study investigated the potential of Brazilian kaolin as a low-cost adsorbent for the removal of Malachite Green (MG) from colored effluents. The morphology, chemical structure and surface properties of the adsorbent were investigated by characterization techniques such as X-ray diffraction, N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy, X-ray fluorescence spectrometry, scanning electron microscopy, thermogravimetric analysis and particle size distribution. A possible technological application of raw kaolin is the MG removal from aqueous media, which was investigated using batch adsorption experiments. The adsorption kinetics was studied using the pseudo-first order, pseudo-second order and Elovich models. The adsorption isotherms were studied using the Langmuir, Freundlich and Sips models. The Elovich model was the more adequate to represent the adsorption kinetic, while the equilibrium was well represented by the Langmuir model. The maximum adsorption capacity, at pH of 6.3 and temperature of 25ºC, was 128 mg g -1 , and this satisfactory result may be associated with some adsorbent properties. Therefore, the results revealed that raw kaolin can be utilized as a promising low-cost adsorbent to remove MG from colored effluents.

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Section: Introductionmentioning

confidence: 99%

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

et al. 2017

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“…The pseudo second-order proposed by Ho and Mckay, 57 based on the assumption that "the rate limiting step are chemisorption involves forces by sharing or exchanging electrons between the adsorbent and the adsorbate" 20,38,56 and is given as:…”

Section: Kinetic Studymentioning

confidence: 99%

“…According to this model, the change in rate of the solute uptake with time is directly proportional to the difference in saturation concentration and the solute uptake with time. 20,56 The linearized integral form of the pseudo first-order model can be expressed as follows: (2) Where q e (mg/g) and q t (mg/g) are the amounts of dyes adsorbed by organoclay at equilibrium and time t (min) respectively. k 1 (min -1 ) is the equilibrium rate constant of pseudo first-order adsorption.…”

Section: Kinetic Studymentioning

confidence: 99%

Adsorption Kinetics of Malachite Green and Methylene Blue from Aqueous Solutions Using Surfactant-modified Organoclays

Ullah

Nafees²,

Iqbal

et al. 2017

ACSi

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The main objective of this research is to study the adsorption behaviour of malachite green and methylene blue dyes onto the surfactant modified natural clays. The results of SEM, XRD, IR, and thermal analysis confirms the intercalation of organic moiety in to the clay. The adsorption results show that pseudo-first order kinetics best fitted for both the dyes adsorbed on organo-clay. The data also reveals that both dyes are in a good agreement with Langmuir isotherm in both types of modified clays. The value of separation factor, R L , from Langmuir equation and Freundlich constant, n, give an indication of favourable adsorption. The maximum adsorption capacity q m based on Langmuir model was found to be 294-303 mg/g at 25 °C, is in good agreement with the experimental values.

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“…Generally, adsorptive characterics of the adsorbent below and above pH of the dye solution appear to change as a function: of surface charge of the adsorbent, a degree of ionization of adsorptive molecules and a degree of dissociation of functional groups at active adsorbent points [12].…”

Section: Resultsmentioning

confidence: 99%

The removal of the textile basic dye from the water solution by using natural zeolite

Amin¹,

Djordjević²,

Konstantinović³

et al. 2017

Adv Techol

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The use of natural zeolite for elimination of the textile basic dye from the water solution was researched in this paper. The practical simulation of purification of waste water from the textile industry was done. Zeolite was characterized by physical and chemical analysis. SiO 2 dominates the chemical structure of the adsorbent, followed by: Al 2 O 3 , CaO, Fe 2 O 3 , K 2 O. The used natural adsorbent -zeolite is a relatively fine bulk material with heterogenic porous particles, generally smaller than 45 µm. The effect of the initial dye concentration, pH and mixing time was investigated. In lower concentrations, the percentage of the removed dye is higher, but generally observed, a larger amount od dye is absorbed onto zeolite at higher initial concentrations. Longer adsorption time with a higher initial concentration results in a larger amount of the dye adsorbed by the adsorbent. The results confirm that all varied input parameters influence the efficiency of the basic dye adsorption and that the used natural zeolite, as adsorbent, has fulfilled the expectations considering the dye level after adsorption (the amount of the removed dye >82% at pH 4).

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Removal of cationic dyes from aqueous solutions by kaolin: Kinetic and equilibrium studies

Cited by 438 publications

References 24 publications

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

Use of Brazilian Kaolin as a Potential Low-cost Adsorbent for the Removal of Malachite Green from Colored Effluents

Adsorption Kinetics of Malachite Green and Methylene Blue from Aqueous Solutions Using Surfactant-modified Organoclays

The removal of the textile basic dye from the water solution by using natural zeolite

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