Adsorption of p-nitrophenol on organoclays

Park, Yuri; Frost, Ray L.; Ayoko, Godwin A.; Morgan, Dana L.

doi:10.1007/s10973-011-2103-7

Cited by 17 publications

(8 citation statements)

References 18 publications

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“…Zeta potential of the organoclays For many applications, the sign and magnitude of the zeta potential must be known [43][44][45]. Na-Mt has a highly negative zeta potential (−34.2 mV), whereas organoclays have slightly negative or positive zeta potentials.…”

Section: Specific Surface Area Measurementsmentioning

confidence: 99%

Adsorption behavior and mechanism of chlorophenols onto organoclays in aqueous solution

Zhang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

118

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Section: Specific Surface Area Measurementsmentioning

confidence: 99%

Adsorption behavior and mechanism of chlorophenols onto organoclays in aqueous solution

Zhang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

118

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“…In the present study, we investigated thermal degradation of sorption products to elucidate the mechanism of interaction between the surfactant and the bentonite matrix. There is relatively little research concerning thermal analysis of HDTMA-bentonite [10][11][12][13][14][15][16][17]; however, this problem has received sufficient scrutiny in the works concerning the analog of bentonite, montmorillonite [18][19][20][21][22]. The introduction of phosphate ions to a sorption system is a new problem, and there is a dearth of research concerning thermal analysis of HDTMA-P(V)-bentonite and its modifications with U(VI).…”

Section: Introductionmentioning

confidence: 99%

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

Sternik

Gładysz–Płaska

Grabias

et al. 2017

J Therm Anal Calorim

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The influence of phosphate ions on the thermal stability of complexes obtained by adsorption of uranium(VI) on organobentonite was determined. Organoclay samples were prepared by the reaction of hexadecyltrimethylammonium bromide with bentonite. The isotherms of sorption/desorption of U(VI) from aqueous solutions containing phosphate ions onto different forms of bentonite were measured using the batch method. The highest amount of uranium was absorbed on HDTMAbentonite in the presence of phosphates. This may have been associated with the complexing of U(VI) ions by phosphate ions, which interacted with surfactant cations probably via electrostatic forces. A TG-DSC-MS study showed that the thermal decomposition of the surfactant sorbed on bentonite proceeded in two stages: at 200-400 and at 600-800°C. The first stage involved defragmentation and oxidation of surfactant cations present in the interior and on the surface of the mineral. The second stage involved oxidation of charcoal and simultaneous dehydroxylation of the sorbent. The oxidation of surfactant cations and the dehydroxylation of the mineral were suppressed in the presence of phosphates.

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“…However, PILCs do not efficiently remove the hydrophobic organic compounds from water because of the hydrophilic surface. In contrast, OMts show excellent hydrophobicity and can be used as efficient adsorbents for organic pollutants [17][18][19][20] and appropriate fillers in synthesis of claybased nanocomposites [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

Zhou

Tian

et al. 2013

J Therm Anal Calorim

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For combining the properties of organoclays and pillared clays, inorganic-organic clays have attracted much attention in recent years. In this study, Al Keggin cation pillared montmorillonites (Al-Mts) were first prepared and parts of Al-Mts were calcined at different temperatures (C-Al-Mts). The inorganic-organic montmorillonites were synthesized by intercalating Al-Mts and C-Al-Mts with the cationic surfactant, hexadecyltrimethyl ammonium bromide (HDTMAB). The products were characterized by X-ray diffraction, X-ray fluorescence, and simultaneous thermogravimetric analysis. For HDTMAB-modified uncalcined Al Keggin cation pillared montmorillonites (H-Al-Mts), the basal spacing increased with the increment of surfactant loading level, but the Al content of H-Al-Mts decreased simultaneously, indicating that the intercalated surfactant replaced some Al Keggin cations in the interlayer space. However, in the case of C-Al-Mts, the interlayer spaces could not be further expanded after surfactant modification, implying that the neighboring montmorillonite layers were ''locked'' by the aluminum pillars which were formed by dehydroxylation of Al Keggin cation pillars during thermal treatment. The thermal stability of HDTMAB-modified C-Al-Mts (H-C-Al-Mts) was much better than that of H-AlMts. The major mass loss of H-C-Al-Mts occurred at ca. 410°C, corresponding to decomposition of intercalated surfactant cations. In contrast, H-Al-Mts displayed two mass loss temperatures at ca. 270 and 410°C, corresponding to the evaporation of surfactant molecules and the decomposition of surfactant cations in the interlayer space, respectively.

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Adsorption of p-nitrophenol on organoclays

Cited by 17 publications

References 18 publications

Adsorption behavior and mechanism of chlorophenols onto organoclays in aqueous solution

Adsorption behavior and mechanism of chlorophenols onto organoclays in aqueous solution

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

Investigation of structure and thermal stability of surfactant-modified Al-pillared montmorillonite

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