Organic Pillared Clays

Meier, Lorenz; Nueesch, Rolf; Madsen, Fritz T.

doi:10.1006/jcis.2001.7498

Cited by 90 publications

(40 citation statements)

References 19 publications

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“…As seen in Table 1, the difference in totally sorbed amount was attributed to the clay minerals present, while S1 sediment contained more montmorillonite and kaolinite in the clay minerals (than S2 sediment) which can increase the extent of BPA sorption. One explanation is that montmorillonite, whose structure permits a significant swelling by intercalation of pollutants, is characterized by preferential sorption processes on the mineral surfaces (Meier et al 2001). Shareef et al (2006) reported that BPA could be sorbed by montmorillonite and kaolinite; furthermore, montmorillonite had a significantly greater capacity to sorb BPA than goethite or kaolinite (nonexpanding minerals) especially at above pH 8.…”

Section: Sorption Isothermsmentioning

confidence: 98%

Sediment–Water Interactions of Bisphenol A Under Simulated Marine Conditions

Tian

Wang

Song

2008

Water Air Soil Pollut

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The sorption behavior of bisphenol A (BPA) on marine sediments treated using different methods was investigated in batch equilibrium experiments. Adsorption isotherms were well fitted to Freundlich model and the model parameters, K F and n, had been evaluated. When temperature decreased from 308 to 288 K, Freundlich constant (K F ) increased about 200%. K F increased by approximately 92.6% with increase of salinity from 1:2 artificial seawater (1:2 ASW) to ASW conditions. The plateau sorption capacity was around 0.8579 mg/g in the pH range 7.46-8.34, whereas the adsorption capacity decreased from 0.8579 to 0 mg/g when pH from 8.34 to 8.91, suggesting that the undissociated species were adsorbed more readily and that electrostatic repulsion may inhibit sorption as pH increases. The increase of K F value between the two media from natural seawater to ASW was around 25.3%, indicating the presence of dissolved organic matter appeared to have a significant effect on sorption. Mineral surface of sediment, together with microporosity of sediment, showed to be primarily responsible for the sorption of BPA.

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Section: Sorption Isothermsmentioning

confidence: 98%

Sediment–Water Interactions of Bisphenol A Under Simulated Marine Conditions

Tian

Wang

Song

2008

Water Air Soil Pollut

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“…Another modification process is based on the exchange of the inorganic cations by organic ones, especially alkylammonium cations, which keep apart the aluminosilicate layers, resulting flexible pillars due to the mobility of the alkyl chains. 19 This modification aims to increase the hydrophobic character of the mineral surface, enhancing the affinity by organic compounds. Depending on the organic cation structure and its uptake into the clay gallery, the organoclay may have different hydrophobic properties.…”

Section: +mentioning

confidence: 99%

Sorption of atrazine, propazine, deethylatrazine, deisopropylatrazine and hydroxyatrazine onto organovermiculite

Abate

Masini

2005

J. Braz. Chem. Soc.

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hexadeciltrimetil-amônio (HDTMA-VT) no espaço interlamelar. A VTK bruta teve interação desprezível com AT, PROP e DEA, interação moderada com DIA e forte interação com HAT. No caso do material HDTMA-VT as porcentagens de remoção em meio aquoso (concentrações iniciais entre 0,05 a 1,00 mg L -1 ) foram: 56 -63% para AT, 43 -45% para DEA, 30 -24% para DIA, 12 -19% para HAT e 77 -78% para PROP. As taxas de sorção de AT, DEA e PROP em HDTMA-VT foram significativamente aumentadas com relação a VTK. Força iônica e pH tiveram pouca influência na sorção. A dessorção dos compostos previamente sorvidos sobre os minerais HDTMA-VT variou de 20 a 30% após um tempo de contacto de 24 h.The interaction of atrazine (AT), propazine (PROP), deethylatrazine (DEA), deisopropylatrazine (DIA) and hydroxyatrazine (HAT) was studied with the clay mineral vermiculite saturated with K + (VTK), and with the mineral modified by insertion of hexadecyltrimethyl-ammonium (HDTMA-VT) in the interlayer of VTK. The crude VTK exhibited negligible interaction with AT, PROP and DEA, moderate interaction with DIA and strong interaction with HAT. For the HDTMA-VT materials, removal percentages from aqueous medium for initial concentrations between 0.05 and 1.00 mg L -1 were 56 to 63% for AT, 43 to 45% for DEA, 12 to 19% for HAT and 77 to 78% for PROP. Sorption of AT, DEA and PROP onto HDTMA-VT was significantly enhanced in comparison to VTK. Ionic strength and pH had no significant influence on the sorption process. Desorption of all compounds from HDTMA-VT after 24 h of contact time was between 20 and 30% of the amount initially adsorbed.

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“…Organoclays (OC) synthesized by intercalating alkylammonium ions into clay minerals interlayer spaces have shown excellent adsorption capability toward hydrophobic organic compounds, and attracted great interest in various pollution control fields such as soil remediation and wastewater treatment (Bergaya et al, 2006;Meier et al, 2001;Sheng et al, 1998;Stockmeyer and Kruse, 1991;Zhu et al, 2008b). Previous studies have demonstrated that the adsorption capacity of OC is strongly affected by the interlayer surfactant loading amount and structures (Boyd et al, 1988a(Boyd et al, , 1988b(Boyd et al, , 1988cBoyd, 1991a, 1991b).…”

mentioning

confidence: 99%