Adsorption of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) on alumina: Influence of solution pH and cations

Wang, Fei; Shih, Kaimin

doi:10.1016/j.watres.2011.03.007

Cited by 343 publications

(190 citation statements)

References 27 publications

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“…PFOS has been recognized as a global contaminant and was designated as a new member of persistent organic pollutants (POPs) under the Stockholm Convention in 2009 [4]. Different from other POPs, PFOS are highly water-soluble and thus are easy to transport in the aquatic environment [5]. Therefore, the solidwater interfacial process is believed to be a critical factor determining the toxicity and environmental fate of PFOS and has been subjected to intense investigation [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…However, macroscopic experiments provide little information about the surface-associated modes and self-assemble microstructures. In fact, the interaction processes of PFOS with the solidwater interface are complex, changes in the isotherm slope depend on the interactions between hydrophobic tails, repulsions between headgroups and interactions between surfactant molecules with the solid surface [5,8]. The mechanisms need to be further verified by atomic-molecular level technologies.…”

Section: Introductionmentioning

confidence: 99%

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Assembling structures and dynamics properties of perfluorooctane sulfonate (PFOS) at water–titanium oxide interfaces

He¹,

Pan²,

Zhang³

2013

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assembling structures and dynamics properties of perfluorooctane sulfonate (PFOS) at water–titanium oxide interfaces

He¹,

Pan²,

Zhang³

2013

Journal of Colloid and Interface Science

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“…Alumina surfaces have been found to be more reactive when compared with many other soil minerals, and this reactivity has been widely used for fabricating adsorbents (Al-Abadleh and Grassian 2003;Essington and Anderson 2007;Álvarez et al 2011;Wang and Shih 2011) and catalysts (Hass et al 1998;He et al 2005). Dried aluminas commonly chemisorb at least a monolayer of water when exposed to moisture at ambient conditions, and when the surfaces are hydrated, the top layer of oxide ions will be converted into a filled and square lattice of hydroxyl ions (Goldberg et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Dechlorinating transformation of propachlor through nucleophilic substitution by dithionite on the surface of alumina

et al. 2012

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Purpose The aim of this study was to evaluate the roles of aluminum-based minerals, especially their surface Lewis acid sites (LASs), on the transformation and fate of chloroacetanilide herbicide contaminants when nucleophilic reagents are present. Materials and methods Batch experiments were used to study propachlor transformation processes under different reaction conditions. The surface bonding of aluminas before and after interacting with propachlor and dithionite were characterized by Fourier transform infrared (FTIR) spectra. The LASs on different aluminas, acting as the key role for accelerating the propachlor transformation, were analyzed by pyridine adsorption/FTIR spectroscopic technique. Results and discussion Rates of dithionite-initiated propachlor dechlorination were increased in the presence of aluminas. Transformation efficiencies of propachlor on different aluminas were found to be as γ-Al 2 O 3 >γ-AlOOH>α-Al 2 O 3 . A higher reaction temperature, higher pH, and higher alumina dosage can further increase the propachlor dechlorination rate.The addition of citric acid may block the active sites on alumina and reduce propachlor transformation by dithionite. FTIR and pyridine adsorption/diffuse reflectance Fourier transform infrared spectroscopy indicated that Al-S and Al-O bonds on the LASs of alumna play a key role in accelerating propachlor transformation. Conclusions LASs on alumina surfaces can effectively accelerate the propachlor transformation by dithionite. The strong electron accepting ability of LASs gives dithionite a favorable affinity to form surface sulfur compounds, which are stronger reductants and nucleophilic reagents for propachlor dechlorination. The intensities of LASs on alumina surfaces can be used to control the rate of propachlor transformation by dithionite.

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“…Moreover, some researchers attribute this beneficial effect to the onset of specific bridging interactions between Ca 2þ and the sulfonate group of PFOS [57][58][59] in this circumstance using density functional theory calculations [17]. As shown in Fig.…”

Section: Effect Of Ionic Strength On Pfos Rejectionmentioning

confidence: 98%

Fabrication of novel poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane for effective removal of trace amount perfluorooctane sulfonate from water

Wang

Zhao

et al. 2015

Journal of Membrane Science

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a b s t r a c tThis study investigated the separation performance of a hollow fiber nanofiltration membrane, which was fabricated from poly(m-phenylene isophthalamide) (PMIA) using a dry-jet wet spinning technology, for sustainable water recovery from water containing trace amount of perfluorooctane sulfonate (PFOS) that was a persistent organic pollutant commonly existed in water. SEM spectra indicated that the cross section of the hollow fiber membrane had an asymmetrical structure that consisted of a dense outer surface acting as a selectively layer, a spongy-like transition layer, and finger-like microvoids close to the inner surface. The average pore size and molecular weight cut-off, which were estimated using the solute rejection method, were 0.404 nm and 904 Da, respectively. The PFOS rejection experiments were carried out at the trans-membrane pressures ranging from 4 Â 10 5 Pa to 1.0 Â 10 6 Pa and PFOS concentrations from 50 μg/L to 500 μg/L. In all cases, the PFOS rejections were found to be increased as the PFOS concentration increased. The impact of the pH value and Ca 2 þ concentration of the feed solution on the PFOS rejections was studied in detail. The PFOS rejections improved from 91.17% to 97.49% with an increase in pH from 3.2 to 9.5 at 4 Â 10 5 Pa. An increase of Ca 2 þ concentration from 0.1 mM to 2 mM enhanced PFOS rejection from 97.10% to 99.40% at a trans-membrane pressure of 4 Â 10 5 Pa. The sorption/desorption experiments indicated that the amount of PFOS adsorbed on the membrane surface was five times higher in the presence of Ca 2 þ (2 mM). AFM experiments also demonstrated that the membrane surface was rough with the addition of Ca 2 þ . Hence, the presence of Ca 2 þ enhanced the PFOS adsorption in the membrane surface and caused more pore blockage of the membrane. As such, the declination in the water flux and augmentation in the PFOS rejection were observed.

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Adsorption of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) on alumina: Influence of solution pH and cations

Cited by 343 publications

References 27 publications

Assembling structures and dynamics properties of perfluorooctane sulfonate (PFOS) at water–titanium oxide interfaces

Assembling structures and dynamics properties of perfluorooctane sulfonate (PFOS) at water–titanium oxide interfaces

Dechlorinating transformation of propachlor through nucleophilic substitution by dithionite on the surface of alumina

Fabrication of novel poly(m-phenylene isophthalamide) hollow fiber nanofiltration membrane for effective removal of trace amount perfluorooctane sulfonate from water

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