Adsorption of an anionic dye from aqueous medium by organoclays: equilibrium modeling, kinetic and thermodynamic exploration

Bhatt, Adarsh S.; Sakaria, Praful L.; Vasudevan, Mukund; Pawar, Radheshyam R.; Sudheesh, N.; Bajaj, Hari C.; Mody, Haresh M.

doi:10.1039/c2ra20347b

Cited by 220 publications

(116 citation statements)

References 42 publications

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“…15,29,[33][34][35] In the current work, the unmodified MMt has a d-spacing of 1.23 nm, which expanded when the intercalated ions were exchanged with surfactants small particle size, smooth and micro-porous surface with fluffy appearance due to the closely packed flakes. The BET surface area of unmodified MMt clay was found to be 58 m /g for HDT-MA and HDPy surfactant respectively.…”

Section: Xrdmentioning

confidence: 99%

“…As depicted by the Figure 6 that adsorption of both dyes onto the organoclays increases with the increase of contact time, which is consistent with the previous studies. 14,29,34 At first, the adsorption of dyes occurs through boundary layer adsorption and the adsorptions rates were high because of the accessibility of the higher surface area for the rapid attachment of these dyes to the external exposed surfaces of the organoclays and backs off step by step in the dye onto the organoclay shows opposite trends by varying the concentration of dye solution. Several researchers also found the same adsorption results as function of MB and MG dye concentration.…”

Section: 2 Effect Of Timementioning

confidence: 99%

“…25,26,29 In this work, the Langmuir and Freundlich isotherm models were used to showing the relationship between the amount of adsorbed MG and MB dyes and their concentration in solution at constant pH at room temperature. Langmuir isotherm model suggests that the adsorption of adsorbate molecules by the adsorbent materials takes place on a homogenous surface by monolayer without any interaction with adjacent adsorbed molecules.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

“…24 Literature review shows the number of models which govern adsorption equilibrium, out of them the Langmuir and the Freundlich isotherm models are the most commonly used, others include modified Freundlich, Sips, Redlich-Peterson, Dubnin-Radushkevich constants, Tempkin constants etc. 24,29 Several steps can be used to study the controlling mechanism of adsorption process such as chemical reaction, diffusion control, and mass transfer; kinetic models are used to the experimental data from the adsorption process. 28 The kinetic parameters are useful for the prediction of adsorption rate, and gives valuable information for designing and modelling the adsorption processes.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Xrdmentioning

confidence: 99%

Section: 2 Effect Of Timementioning

confidence: 99%

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…At 50 °C, the removal was enhanced to 85 % and a maximum of amount removed of 90 mg/g was achieved for a Ci of 900 ppm. These results were due to a higher partitioning rate of dye molecules in organophilic silicates, similar to that of organoclays and organo-kenyaites [33,48], or to the temperature activation of other sites (a function of the intercalated C16TMA) that started to fix eosin molecules and led to the increase of the amount removed. This fact indicated that the removal of eosin was an endothermic process [61].…”

Section: Effect Of Removal Temperaturementioning

confidence: 86%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Kooli¹,

Liu²,

Abouddi³

et al. 2018

Preprint

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Na-magadiite exchanged with cetyl-trimethylammonium cations provided organophilic silicate materials that allowed the effective removal of the acidic dye "eosin". The organic cations were intercalated into the interlayer spacing of the layered silicate via an exchange reaction between the organic cations from their bromide salt and the solid Na-magadiite at room temperature. Different techniques were used to characterize the effect of the initial concentration of the surfactant on the structure of the organo-magadiites. The C, H, N analysis indicated that a maximum of 2 organic cations of 1.03 mmol/g was achieved at initial concentrations higher than 0.25 mmol/g and was accompanied by an expansion of the basal spacing of 3.15 nm, with a tilted angle of 64.5° to the silicate layers. The conformation of the organic surfactants was probed using solid-state 13 C, finding mainly the trans conformation similar to that of the starting cetyl trimethylammonium bromide salt (C16TMABr).Thermal gravimetric analysis was carried out to study the thermal stability of the resulting organo-magadiites. The intercalated surfactants started to decompose at 200 °C, with a mass loss percentage of 8 % to 25 %, depending on the initial loading of the surfactant, and was accompanied by a decrease of the basal spacing from 3.20 nm to 2.51 nm, as deduced from the in situ X-ray diffraction studies. At temperatures below 220 °C, an expansion of the basal spacing from 3.15 to 3.35 nm occurred.These materials were used as a removal agent for the anionic dye "eosin". The maximum amount of the dye removed was related to the organic cation content and to the initial concentration of eosin, with an improvement from 2.5 mg/g to 98 mg/g. This value decreased when the organo-magadiite was preheated at temperatures above 200 °C. The regeneration tests indicated that an 85 % removal efficiency was maintained after 6 cycles of use for the organo-magadiites.

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Inner‐coated highly selective thin film nanocomposite hollow fiber membranes for the mixture gas separation

Ingole

2022

J of Applied Polymer Sci

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Polyamide-based thin film nanocomposite (TFN) membranes were prepared by incorporating nanoparticles in an aqueous phase containing mphenylenediamine (MPD) and an organic phase containing trimesoyl chloride (TMC) by interfacial polymerization (IP) method. The 3-aminopropyltrimethoxy silane grafted mesoporous synthetic hectorite (APTMSH) was synthesized and added in an aqueous monomer solution while the IP. In this work, the TFN layer interfacial compatibility has been enhanced by building the covalent bond between APTMSH and other two monomers by IP method. The coating of the TFN selective layer was done on the inner surface of polysulfone hollow fiber membranes. The interesting results were obtained for the binary mixture gas separation containing water vapor/N 2 and CO 2 /CH 4 . Improved gas permeance and selectivity have been obtained using APTMSH-incorporated TFN membranes. The developed TFN membranes have been characterized using several physicochemical methods. The results show that with the addition of APTMSH in MPD solution up to 0.5 w/w% the best water vapor permeance 2485 GPU and CO 2 permeance 22.3 GPU were obtained along with water vapor/N 2 selectivity 725.5 and CO 2 /CH 4 selectivity 26.

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Adsorption of an anionic dye from aqueous medium by organoclays: equilibrium modeling, kinetic and thermodynamic exploration

Cited by 220 publications

References 42 publications

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

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

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Inner‐coated highly selective thin film nanocomposite hollow fiber membranes for the mixture gas separation

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