Mechanism of adsorption of anionic dye from aqueous solutions onto organobentonite

Ma, Jianfeng; Cui, Bingying; Dai, Juan; Li, Dinglong

doi:10.1016/j.jhazmat.2010.12.073

Cited by 106 publications

(64 citation statements)

References 38 publications

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“…In Fig. 2, the AOH stretching region in 3700-3000 cm À1 is characterized by two bands, the sharp intense peak at 3624 cm À1 is assigned to the structural AOH group in the clays and the broad band at 3434 cm À1 is ascribed to hydrogen bonded water molecules adsorbed within the interlayer space of the clay, and the peaks at 1640 cm À1 are corresponding to HAOAH bending vibration [18]. The anti-symmetric stretching vibration v as (ACH 2 ) and symmetric stretching vibration v s (ACH 2 ) occurs at 2914 and 2842 cm À1 , respectively, which is not shown in the spectra of Na-Mt.…”

Section: Characterization Of Organo-montmorillonitesmentioning

confidence: 99%

The characterization of organo-montmorillonite modified with a novel aromatic-containing gemini surfactant and its comparative adsorption for 2-naphthol and phenol

Yang

Gao

Luo

et al. 2015

Chemical Engineering Journal

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Section: Characterization Of Organo-montmorillonitesmentioning

confidence: 99%

The characterization of organo-montmorillonite modified with a novel aromatic-containing gemini surfactant and its comparative adsorption for 2-naphthol and phenol

Yang

Gao

Luo

et al. 2015

Chemical Engineering Journal

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“…Several authors have informed the use of bentonite modified and organobentonite with a cationic surfactant for acidic dye elimination via high loading quantity of surfactant [20][21][22]. Preceding studies had shown that the main mechanism of the adsorption interpreted the acidic dye elimination is the anionic exchange between excessive anions and pollutants from the surfactant [23]. Hence, to obtain a high sorption capacity, modifications need surfactants at twice the CEC.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Acid Dyes onto Bentonite and Surfactant-modified Bentonite

Youssef¹,

MM²

2013

J Anal Bioanal Tech

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Adsorption of Congo red (CR) from water via batch adsorption experiments onto bentonite and CTAB-modified bentonite (CTAB-MBn) was investigated. Studies concerning the factors influencing the adsorption capacities of bentonite and CTAB-MBn, such as initial dye concentration, adsorbent dosage, pH, ionic strength, contact time and temperature were systematically investigated and discussed. The results revealed that CTAB-modified bentonite demonstrated high adsorption capacities toward acid dyes, while bentonite exhibited sorption capacities lower than CTAB-MBn. The kinetics data were analyzed using first order and pseudo-second order models. It was best described by the pseudo-second order model. The isotherm data were investigated accord¬ing to Langmuir and Freundlich equations. Thermodynamic parameters ΔG°, ΔH° and ΔS° were calculated for the adsorption of CR on bentonite and CTAB-MBn ; the value of ΔG° showed the spontaneous nature of adsorption for both sorbents.

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“…[19] A clay mineral modified with long-chain surfactant exhibited a higher removal capacity than did short-chain surfactant. For this purpose, cetyl trimethyl ammonium (C16TMA) was the most commonly used cation, obtained from the corresponding salt; the bromide form was used to prepare organo-clays or silicates [20,21].…”

Section: Introductionmentioning

confidence: 95%

“…The C16TMA + cations generated an organophilic phase partition in the interlayer spacing, and the partition occurred through the interaction of the dye with the cationic C16TMA + cations [58,59,60].…”

Section: Effect Of Organic Contentmentioning

confidence: 99%

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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Mechanism of adsorption of anionic dye from aqueous solutions onto organobentonite

Cited by 106 publications

References 38 publications

The characterization of organo-montmorillonite modified with a novel aromatic-containing gemini surfactant and its comparative adsorption for 2-naphthol and phenol

The characterization of organo-montmorillonite modified with a novel aromatic-containing gemini surfactant and its comparative adsorption for 2-naphthol and phenol

Adsorption of Acid Dyes onto Bentonite and Surfactant-modified Bentonite

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

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