Sorption Model for Dissolved Aluminium in Freshwaters

Upadhyay, S.; Liss, Peter S.; Jickells, Tim

doi:10.1023/b:aqua.0000003822.15914.1f

Cited by 15 publications

(15 citation statements)

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“…As a simplified illustration of a mechanism by which this may occur under laboratory conditions, the specific case of surface alumina is now considered. Evidence of adsorption of aluminium ions on titania, prepared like the rutile used in this study by hydrolysis of TiCl 4 , was systematically generated in a series of studies by Healy and co-workers and facilitates this consideration [8][9][10][11]. TiO 2 particles in aqueous suspension carry a pH dependent surface charge.…”

Section: The Implications Of These Results For Practical Treatment Ofmentioning

confidence: 99%

“…The rutile used for the majority of the studies described in this paper was prepared by the aqueous hydrolysis of TiCl 4 and supplied by the Solaveil business of Uniqema (now Croda Chemicals). The characterization of similar particles has been described more fully elsewhere [14,15].…”

Section: Preparation Of Alumina and Silica Coatings On High Area Rutilementioning

confidence: 99%

“…Instead they are very different. Consideration of the chemical shifts [25] 4 is much less in the coating than in the aerosil. The possibility that the reduced cross-linking was because of the low temperature at which the coating silica had been deposited was excluded by the negligible difference between spectra of a 3% coated sample before and after 450 °C heat-treatment, Figure 2B.…”

Section: Rutilementioning

confidence: 99%

“…Although many studies have highlighted the potential of TiO 2 photocatalysis for the degradation of organic pollutants, especially dye residues in aqueous effluent [1][2][3], any practical application must consider the influence of other chemicals, of either natural or anthropogenic origin, in the water to be treated. Aluminium may be introduced as a flocculant in water treatment systems or as a mordant in dyehouses and although the concentrations of naturally occurring aluminium in the world's major rivers are highly variable they may be as high as 100 μM [4][5][6][7]. Classical colloid studies on model systems, summarized in the discussion section below, have shown significant adsorption of aluminium species on titania surfaces at these concentrations [8][9][10][11] and this paper considers the influence on photocatalytic activity of hydrous oxides of aluminium deliberately deposited on the TiO 2 surface.…”

Section: Introduction and Scopementioning

confidence: 99%

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The Influence of Surface Alumina and Silica on the Photocatalytic Degradation of Organic Pollutants

Egerton

2013

Catalysts

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Practical photocatalysis for degradation of organic pollutants must take into account the influence of other chemicals. Significant Al deposition on titania can occur at naturally occurring concentrations of dissolved Al. This paper reviews the author's work on the influence of deliberately deposited hydrous oxides of aluminium on the behavior of a ~130 m 2 g −1 rutile TiO 2 , and then compares the behavior of deposited alumina with that of deposited silica. On rutile some adsorbed nitrogen is infrared-active. Alumina and silica deposited on the rutile reduce, and ultimately eliminate, this infrared-active species. They also reduce photocatalytic oxidation of both propan-2-ol and dichloroacetate ion and the photocatalytic reduction of diphenyl picryl hydrazine. The surface oxides suppress charge transfer and may also reduce reactant adsorption. Quantitative measurement of TiO 2 photogreying shows that the adsorbed inorganics also reduce photogreying, attributed to the capture of photogenerated conduction band electrons by Ti 4+ to form Ti 3+ . The influence of adsorbed phosphate on photocatalysis is briefly considered, since phosphate reduces photocatalytic disinfection. In the context of classical colloid studies, it is concluded that inorganic species in water can significantly reduce photoactivity from the levels that measured in pure water.

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Section: The Implications Of These Results For Practical Treatment Ofmentioning

confidence: 99%

Section: Preparation Of Alumina and Silica Coatings On High Area Rutilementioning

confidence: 99%

Section: Rutilementioning

confidence: 99%

Section: Introduction and Scopementioning

confidence: 99%

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The Influence of Surface Alumina and Silica on the Photocatalytic Degradation of Organic Pollutants

Egerton

2013

Catalysts

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“…This makes it useful as a biogeochemical tracer of water masses to indicate the level of interaction the target water mass has had with terrestrial sources of trace nutrients (such as windblown dust depositing into the ocean [Measures and Edmond 1989], although this relationship is limited to surface waters due to sedimentary resuspension [Middag et al 2009;Moran and Moore 1991]). Aluminum is ≈8% of the earth's crust (Taylor 1964), yet is present in natural waters at trace levels, with reported values ranging from ≈2.5 µM in rivers (Upadhyay et al 2002) to < 1 nM in the open ocean (Measures and Edmond 1990;Middag 2010;Orians and Bruland 1985). The extremely low levels in the open ocean are due to the very low solubility of aluminum in the highly complex seawater matrix and geographic isolation from continental sources of alu- Tomas Remenyi 1,2,3 , Pavel Nesterenko 1 *, Andrew Bowie 2,3 , Edward Butler 1 , and Paul Haddad minum.…”

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confidence: 99%

Reversed phase high performance liquid chromatographic determination of dissolved aluminium in open ocean seawater

Remenyi

Nesterenko

Butler

et al. 2012

Limnology & Ocean Methods

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Popular shipboard techniques to determine dissolved aluminium in open ocean seawater have two major disadvantages: relative to HPLC techniques, they require large sample volumes; and, in practice they are are only semi-automated. To address these two issues, the application of a reversed-phase high performance liquid chromatographic (RP-HPLC) method for the determination of the aluminium in open ocean seawater was developed. With this method, dissolved aluminium in the sample was complexed with lumogallion at pH 5.5 by the addition of a reagent, producing the fluorescent aluminium-lumogallion complex. This complex was concentrated onto a Chromolith ® RP-18e Guard (10 × 4.6 mm) column and eluted with 95% methanol into a fluorescence detector (λ ex = 505 nm, λ em = 574 nm). Sample pre-treatment required 10 h (>100 samples can be prepared simultaneously) and sample analysis required 375 mL of sample per vial analysed, with 10 mL and 2.7 min per injection. Total required sample volume (including rinses) was 1.5 mL. Limit of detection was 0.13±0.05 nM, with precision of 2.7% at 1 nM on SAFe reference samples. Agreement with SAFe reference samples was within 4.6±4.6% (n = 13). The technique is robust, inherently automated and could easily be applied shipboard for open ocean analyses. It provides improvements in sample efficiency, operational robustness and automation relative to popular shipboard techniques, especially when applied to samples with dissolved aluminium concentrations that approach the limit of detection. This project was a contribution to the GEOTRACES program.

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Geochemical behavior of dissolved manganese in the East China Sea: Seasonal variation, estuarine removal, and regeneration under suboxic conditions

Wang

Ren

Jiang

et al. 2016

Geochem Geophys Geosyst

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To better understand the geochemical cycle of dissolved manganese (Mn) in the East China Sea (ECS), the distribution of dissolved Mn across the ECS was investigated during three field studies in 2011 (May, August, and November). The concentration of dissolved Mn decreased across the ECS with distance from the coast. Mn‐rich ECS shelf waters could export to the Kuroshio Waters, and had the potential to influence the northwest Pacific Ocean as well as the Japan Sea. The Kuroshio Waters were devoid of dissolved Mn, so its incursion could be tracked as it entered the ECS continental shelf region (approximately 50 m isobath). Seasonal variations of dissolved Mn in the ECS were significant, with the highest concentrations occurring in summer. Dissolved Mn in the Changjiang Estuary was nonconservative, and significant quantities were removed by net sorption onto suspended particulate matter. A model describing the sorption processes was applied to data for the Changjiang Estuary. Regeneration of dissolved Mn took place in near‐bottom waters of the suboxic zone in August 2011, following extensive consumption of oxygen. The benthic flux of dissolved Mn was estimated based on Mn concentrations in the overlying waters and the near‐bottom waters. A preliminary box model was established to develop a dissolved Mn budget for the ECS. Based on the dissolved Mn content in the ECS and the total input flux, a residence time of 76–350 days for dissolved Mn in the ECS was inferred.

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Sorption Model for Dissolved Aluminium in Freshwaters

Cited by 15 publications

References 55 publications

The Influence of Surface Alumina and Silica on the Photocatalytic Degradation of Organic Pollutants

The Influence of Surface Alumina and Silica on the Photocatalytic Degradation of Organic Pollutants

Reversed phase high performance liquid chromatographic determination of dissolved aluminium in open ocean seawater

Geochemical behavior of dissolved manganese in the East China Sea: Seasonal variation, estuarine removal, and regeneration under suboxic conditions

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