Interactions of Monovalent Organic Cations with Pillared Clays

Mishael, Yael G.; Rytwo, Giora; Nir, Shlomo; Crespin, M.; Annabi-Bergaya, Faïza; Damme, H. Van

doi:10.1006/jcis.1998.5896

Cited by 45 publications

(27 citation statements)

References 31 publications

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“…This behaviour in the presence of salt, of cationic dye through negatively porous medium, is in agreement with the works reported by other authors [31][32][33][34][35]. More recently, Bilgic¸ [36], found that the adsorption capacities of MB dye on bentonite and sepiolite decrease with increasing ionic strength.…”

Section: Effect Of the Ionic Strengthsupporting

confidence: 92%

Adsorption and Removal of Organic Dye at Quartz Sand-Water Interface

Jada

Akbour

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvellesRe´sume´-Adsorption et de´sorption d'un colorant organique a`l'interface sable de quartz-eauNous avons e´tudie´le transport, la sorption et la de´sorption d'un cation organique (bleu de me´thyle`ne (BM)), a`travers un milieu poreux constitue´de particules de sable de quartz charge´es ne´gativement. Nous avons examine´l'influence des parame`tres, tels que : la force ionique de la solution aqueuse, la vitesse de circulation, le pH de la phase aqueuse, la tempe´rature du milieu et la nature des cations divalents me´talliques pre´sents en solution, sur le transport et le de´poˆt du BM à travers le milieu poreux. Les mesures de la re´tention du colorant ont e´te´re´alise´es en utilisant la technique d'injection-e´chelon. Les re´sultats obtenus ont montre´une diminution de la quantite´de BM adsorbe´sur le quartz lorsque le pH de la phase aqueuse diminue de 9,5 a`4. Une baisse de la quantite´de BM adsorbe´a e´te´e´galement observe´e lorsque la force ionique ou le de´bit augmente. Cependant, l'augmentation de la tempe´rature a conduit a`une augmentation de la quantite´de BM adsorbe´e, ce qui laisse supposer que l'adsorption du BM sur la surface de quartz est de nature endothermique. En pre´sence de cations divalents en solution (Ca 2+ , Cu 2+, Zn 2+ et Ba 2+ ), la quantite´retenue du colorant de´pend de la nature du cation. L'ensemble de ces re´sultats, montre que l'adsorption du colorant basique est controˆle´e par les interactions e´lectrostatiques entre la surface ne´gative du quartz et le polluant organique cationique.Abstract -Adsorption and Removal of Organic Dye at Quartz Sand-Water InterfaceWe studied the transport, sorption and desorption of organic cation (Methylene Blue, MB) through a porous medium consisting of quartz sand particles negatively charged. We examined various parameters such as the ionic strength of the aqueous solution, the flow velocity, the pH of the aqueous phase, the temperature of the medium and the nature of the divalent metal cations present in solution, which affect the transport and the deposition of MB through the porous medium.Step-input experiments were carried out to measure the dye retention. The data showed a decrease in the MB adsorbed amount on the quartz, when the pH of the aqueous phase, or the temperature, decreases, or when the flow rate, or the affinity of the divalent cation (Ca 2+ , Cu 2+ , Zn 2+ and Ba 2+) toward the quartz surface increases. The increase in ionic strength leads to a small decrease in the MB adsorbed amount. However, the increase in temperature leads to an increase in the retained MB amount, which suggests that the adsorption of MB on the surface of quartz is endothermic in nature. The overall data indicate that, at ambient temperature, electrostatic interaction forces, which occur between the cationic organic pollutant and the negative surface of the quartz substrate, mainly control the adsorption process.

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Section: Effect Of the Ionic Strengthsupporting

confidence: 92%

Adsorption and Removal of Organic Dye at Quartz Sand-Water Interface

Jada

Akbour

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…(Madrid, Spain), and an aluminapillared montmorillonite (ALFULCAT 2C) (Jones et al, 1997;Mishael et al, 1999) supplied by the National Technical University of Athens, Greece. Analytical and technical grade norflurazon, 99.9 and 97.8% purity, respectively, were kindly supplied by Novartis A. G. (Basel, Switzerland).…”

Section: Methodsmentioning

confidence: 99%

Organo-Clay Formulations of the Hydrophobic Herbicide Norflurazon Yield Reduced Leaching

Undabeytia

Nir

Rubin

2000

J. Agric. Food Chem.

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The study aimed to reduce leaching of the hydrophobic herbicide norflurazon (4-chloro-5-methylamino-2-(R,R,R)-trifluoro-m-tolylpyridazin-3-(2H)-one) by adsorbing it on clays or organoclays. The surface of the clay mineral montmorillonite was modified from hydrophilic to hydrophobic by preadsorbing it with organic cations, of which thioflavin-T (TFT) at a loading corresponding to 5 / 8 of the cation-exchange capacity of the clay mineral yielded the highest affinity of adsorption of norflurazon. Pillared clay (PC) used without organic cations exhibited enhanced affinity for norflurazon adsorption, much higher than that of montmorillonite or sepiolite. Fourier transform infrared (FTIR) results showed interactions between aromatic moieties of preadsorbed TFT and the herbicide. Stronger interaction of the herbicide with a clay mineral or organo-clay corresponded to its slower release. Formulations prepared on the basis of montmorillonite-TFT and PC were more effective in reducing herbicide leaching in soil columns in comparison to the commercial formulation, whereas the herbicidal efficiencies were comparable.

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“…The pH of the dye-clay suspension directly affects the nature of the surface charge of adsorbent 30,31 and thus, the degree of ionization and the uptake of RR 120. The amount of dye adsorbed decreased when the final pH increased from 2 to 11 at room temperature (Fig.…”

Section: Initial Ph and Ionic Strength Effects On The Adsorption Of Rmentioning

confidence: 99%