Sorption of tannic acid, phenol, and 2,4,5-trichlorophenol on organoclays

Dentel, Steven K.; Bottero, Jean‐Yves; Khatib, K.; Demougeot, H.; Duguet, J.P.; Anselme, C.

doi:10.1016/0043-1354(94)00277-e

Cited by 139 publications

(80 citation statements)

References 21 publications

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“…The modification of clay surfaces with surfactant is a method to obtain organoclay by transforming organophobic to strongly organophilic surfaces and therefore increases the adsorption capacity for adsorption of organic pollutants. This kind of surfactant-modified organobentonite has been used extensively for a wide variety of environmental applications [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Organobentonite as Efficient Textile Dye Sorbent

et al. 2008

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Domestic bentonite clay was modified using cationic surfactant -hexadecyltrimethylammonium bromide (HDTMA-bromide) in order to obtain more efficient sorbent. Removal of Acid Orange 10 from aqueous solution at different dye concentrations, adsorbent doses, and pH was studied. These studies were carried out under unaltered pH value in order to prove that adjusting pH as an additional operation in wastewater treatment is not entirely necessary. The results obtained confirmed the adsorption capacity is significant even for unaltered pH. The adsorption isotherm data were well fitted with both the Freundlich and Langmuir model and the latter was shown as more appropriate. Dynamical data were well represented with the pseudo second-order kinetic model. The results indicate that HDTMA-bentonite could be employed as low-cost sorbent in textile dye wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Organobentonite as Efficient Textile Dye Sorbent

et al. 2008

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“…The comparatively lower sorption by Ca 2+ -montmorillonite is attributed to the larger enthalpy of hydration of Ca 2+ as compared with Na + . Larger hydration sphere around Ca 2+ obscured a greater portion of the neutral siloxane surface, thereby reducing hydrophobic interactions between these surfaces and phenol [44]. For HDTMA-exchanged montmorillonites, Na + -montmorillonite sorbed more HDTMA than Ca 2+ -montmorillonite due to its higher CEC (89.6 cmol kg −1 for Na + -montmorillonite and 72.4 cmol kg −1 for Ca 2+ -montmorillonite), thus more phenol was partitioned into the surfactant derived organic matter.…”

Section: Sorption Isotherms Of Phenolmentioning

confidence: 99%

Effect of lead on the sorption of phenol onto montmorillonites and organo-montmorillonites

Yan

Shan

Wen

et al. 2007

Journal of Colloid and Interface Science

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The effect of lead (Pb) on the sorption of phenol onto montmorillonite-based sorbents was studied using a batch equilibration method when phenol and Pb were sorbed simultaneously and either Pb or phenol was previously sorbed. The sorbents were Na + -, Ca 2+ -, hexadecyl trimethylammonium (HDTMA)-Na + -, and HDTMA-Ca 2+ -montmorillonites. Pb diminished the sorption of phenol largely onto Na + -or Ca 2+ -montmorillonites, while phenol had little effect on the sorption of Pb onto all sorbents. Pb had no effect on the sorption of phenol onto HDTMA-Na + -or HDTMA-Ca 2+ -montmorillonites either. The sorption capacity of phenol followed the order HDTMA-Na + -> HDTMA-Ca 2+ -> Na + -> Ca 2+ -montmorillonites. The pseudo-second-order equation described the kinetics of phenol sorption well. Sorption isotherms of phenol followed the Freundlich equation. Phenol sorption on HDTMA-Na + -and HDTMA-Ca 2+ -montmorillonites was linear, while that on Na + -and Ca 2+ -montmorillonites was nonlinear.

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“…The organic surfactant-modified clays, or organoclays, have attracted much interest because of their wide applications in the environmental and material sciences [1][2][3][4][5][6]. In the past two decades, cation surfactant-modified montmorillonites may have been the most widely studied organoclays.…”

Section: Introductionmentioning

confidence: 99%