Mechanisms for aqueous photolysis of adsorbed benzoate, oxalate, and succinate on iron oxyhydroxide (goethite) surfaces

Cunningham, Kirkwood M.; Goldberg, Marvin C.; Weiner, Eugene R.

doi:10.1021/es00174a015

Cited by 66 publications

(52 citation statements)

References 31 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are in agreement with a previous study in which the formation of Fe(II) was observed in irradiated lepidocrocite suspensions at pH 4 and 0.01 M ionic strength (Waite and Morel, 1984). The ability of some iron (hydr)oxides to form Fe(II) by intrinsic photoreductive mechanisms has been reported in recent years (Waite and Morel, 1984;Graetzel et al, 1985;Cunningham et al, 1988;Siffert and Sulzberger, 1991). Photoelectrons and photoholes generated in the semiconducting bulk may be scavenged at the surface leading to reduction of surface Fe(III) and oxidation of coordinated water or hydroxyl groups to hydroxyl radicals ( Å OH).…”

Section: Proton-promoted (Photo)dissolution Of Lepidocrocitesupporting

confidence: 93%

Photodissolution of lepidocrocite (γ-FeOOH) in the presence of desferrioxamine B and aerobactin

Borer

Kraemer

Sulzberger

et al. 2009

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Section: Proton-promoted (Photo)dissolution Of Lepidocrocitesupporting

confidence: 93%

Photodissolution of lepidocrocite (γ-FeOOH) in the presence of desferrioxamine B and aerobactin

Borer

Kraemer

Sulzberger

et al. 2009

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

“…Dicarboxylate complexes with iron are of outstanding sensitivity to destruction by photolyzation (Eder, 1880(Eder, , 1906Weller et al, 2014;Zhu et al, 1993): photolysis reduces Fe(III) to Fe(II) by producing H 2 O 2 and oxidation of the organic complex compounds. Then Fe(II) is reoxidized to Fe(III) by H 2 O 2 in the Fenton reaction by the generation of q OH (Cunningham et al, 1988). Due to their elevated polarity, oxidation products containing hydroxyl and carboxyl groups have increased wettability, are more water soluble and are thus rapidly washed out from the atmosphere.…”

Section: Oxidation Of Organic Aerosol Particles Containing Black and mentioning

confidence: 99%

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

et al. 2017

View full text Add to dashboard Cite

Abstract. Power stations, ships and air traffic are among the most potent greenhouse gas emitters and are primarily responsible for global warming. Iron salt aerosols (ISAs), composed partly of iron and chloride, exert a cooling effect on climate in several ways. This article aims firstly to examine all direct and indirect natural climate cooling mechanisms driven by ISA tropospheric aerosol particles, showing their cooperation and interaction within the different environmental compartments. Secondly, it looks at a proposal to enhance the cooling effects of ISA in order to reach the optimistic target of the Paris climate agreement to limit the global temperature increase between 1.5 and 2 • C.Mineral dust played an important role during the glacial periods; by using mineral dust as a natural analogue tool and by mimicking the same method used in nature, the proposed ISA method might be able to reduce and stop climate warming. The first estimations made in this article show that by doubling the current natural iron emissions by ISA into the troposphere, i.e., by about 0.3 Tg Fe yr −1 , artificial ISA would enable the prevention or even reversal of global warming. The ISA method proposed integrates technical and economically feasible tools.

show abstract

“…It was found that oxalic acid decomposes in the presence of Fe under the UV radiation in the laboratory experiment but it is stable in the absence of Fe (Pavuluri and Kawamura, 2012). Oxalic acid can form a complex with Fe (III) (iron (III)-oxalato complex) under aqueous conditions, which can photolyze under an irradiation of UV-A to visible regions to result in CO 2 and Fe (II) (Cunningham et al, 1988;Zuo and Hoigne, 1992;Deguillaume et al, 2005). Malonic acid could also decompose in the presence of Fe (III) although the decomposition rate of its Fe-complex is 4734 K. Kawamura et al: Low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls ca.…”

Section: Depletion Of Oxalic Acid: a Possible Aqueous Phase Degradatimentioning

confidence: 99%

“…In contrast, diacids and related compounds can serve as organic tracers to understand photochemical processing of WSOC possibly in aqueous aerosol phase (e.g., Sorooshian et al, 2006;Ervens et al, 2011). Because photochemical processing of organics in wet aerosols can alter the organic aerosol mass and properties, the studies of diacids and related compounds can represent proxies that are routinely measured for a possibly larger fraction of the aerosols and thus such studies can lead to better understanding of the underlying processes in aqueous aerosols (Cunningham et al, 1988;Faust and Zepp, 1993;Ervens et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer

et al. 2012

View full text Add to dashboard Cite

Abstract. Oxalic and other small dicarboxylic acids have been reported as important water-soluble organic constituents of atmospheric aerosols from different environments. Their molecular distributions are generally characterized by the predominance of oxalic acid (C 2 ) followed by malonic (C 3 ) and/or succinic (C 4 ) acids. In this study, we collected marine aerosols from the Arctic Ocean during late summer in 2009 when sea ice was retreating. The marine aerosols were analyzed for the molecular distributions of dicarboxylic acids as well as ketocarboxylic acids and α-dicarbonyls to better understand the source of water-soluble organics and their photochemical processes in the high Arctic marine atmosphere. We found that diacids are more abundant than ketoacids and α-dicarbonyls, but their concentrations are generally low (< 30 ng m −3 ), except for one sample (up to 70 ng m −3 ) that was collected near the mouth of Mackenzie River during clear sky condition. Although the molecular compositions of diacids are in general characterized by the predominance of oxalic acid, a depletion of C 2 was found in two samples in which C 4 became the most abundant. Similar depletion of oxalic acid has previously been reported in the Arctic aerosols collected at Alert after polar sunrise and in the summer aerosols from the coast of Antarctica. Because the marine aerosols that showed a depletion of C 2 were collected under the overcast and/or foggy conditions, we suggest that a photochemical decomposition of oxalic acid may have occurred in aqueous phase of aerosols over the Arctic Ocean via the photo dissociation of oxalate-Fe (III) complex. We also determined stable carbon isotopic compositions (δ 13 C) of bulk aerosol carbon and individual diacids. The δ 13 C of bulk aerosols showed −26.5 ‰ (range: −29.7 to −24.7 ‰), suggesting that marine aerosol carbon is derived from both terrestrial and marine organic materials. In contrast, oxalic acid showed much larger δ 13 C values (average: −20.9 ‰, range: −24.7 ‰ to −17.0 ‰) than those of bulk aerosol carbon. Interestingly, δ 13 C values of oxalic acid were higher than C 3 (av. −26.6 ‰) and C 4 (−25.8 ‰) diacids, suggesting that oxalic acid is enriched with 13 C due to its photochemical processing (aging) in the marine atmosphere.

show abstract

Mechanisms for aqueous photolysis of adsorbed benzoate, oxalate, and succinate on iron oxyhydroxide (goethite) surfaces

Cited by 66 publications

References 31 publications

Photodissolution of lepidocrocite (γ-FeOOH) in the presence of desferrioxamine B and aerobactin

Photodissolution of lepidocrocite (γ-FeOOH) in the presence of desferrioxamine B and aerobactin

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

Distributions of low molecular weight dicarboxylic acids, ketoacids and α-dicarbonyls in the marine aerosols collected over the Arctic Ocean during late summer

Contact Info

Product

Resources

About