Effects of solar ultraviolet radiation on biogeochemical dynamics in aquatic environments : report of a workshop, Marine Biological Laboratory, Woods Hole, Massachusetts, October 23-26, 1989

Blough, Neil V.; Zepp, Richard G.

doi:10.1575/1912/1001

Cited by 6 publications

(4 citation statements)

References 178 publications

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“…Relationship between Organic Chromium and UV Absorbance. Humic substances usually constitute the major fraction of the naturally occurring dissolved organic carbon in natural waters (19,20). They are also the primary fluorophores and chromophores in a majority of natural waters between 200 and 500 nm (19)(20)(21).…”

Section: Resultsmentioning

confidence: 99%

“…Humic substances usually constitute the major fraction of the naturally occurring dissolved organic carbon in natural waters (19,20). They are also the primary fluorophores and chromophores in a majority of natural waters between 200 and 500 nm (19)(20)(21). A measurement of the absorbance of a water sample at 300 nm will give an indication of the amount of humic material present (27).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hydrophobic C18 Bound Organic Complexes of Chromium and Their Potential Impact on the Geochemistry of Cr in Natural Waters

Kaczynski¹,

Kieber²

1994

Environ. Sci. Technol.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hydrophobic C18 Bound Organic Complexes of Chromium and Their Potential Impact on the Geochemistry of Cr in Natural Waters

Kaczynski¹,

Kieber²

1994

Environ. Sci. Technol.

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“…Another important pathway entails the generation of reactive oxygen species (ROS), among which hydroxyl radicals comprise the main player in degradation of natural organic compounds, in part because they have the highest oxidative potential and can persist in a variety of chemical environments . In addition to production by direct solar photolysis of organics, hydroxyl radicals can be produced by hematite nanoparticles by coupling photocatalyzed iron reduction at their surfaces to reaction with the near-ubiquitous presence of hydrogen peroxide . Heterogeneous Fenton reactions then ensuesometimes referred to as the heterogeneous photo-Fenton pathwayfollowing a general reaction scheme of …”

Section: Introductionmentioning

confidence: 99%

“…18 In addition to production by direct solar photolysis of organics, hydroxyl radicals can be produced by hematite nanoparticles by coupling photocatalyzed iron reduction at their surfaces to reaction with the near-ubiquitous presence of hydrogen peroxide. 19 Heterogeneous Fenton reactions then ensuesometimes referred to as the heterogeneous photo-Fenton pathwayfollowing a general reaction scheme of 20…”

Section: ■ Introductionmentioning

confidence: 99%

Facet-Specific Photocatalytic Degradation of Organics by Heterogeneous Fenton Chemistry on Hematite Nanoparticles

Huang

Chen

Walter

et al. 2019

Environ. Sci. Technol.

115

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Hematite nanoparticles are abundant in the photic zone of aquatic environments, where they play a prominent role in photocatalytic transformations of bound organics. Here, we examine the photocatalytic degradation of rhodamine B by visible light using two different structurally well-defined hematite nanoparticle morphologies. In addition to detailed solid characterization and aqueous kinetics measurements, we also exploit species-selective scavengers in electron paramagnetic resonance spectroscopy to sequester specific reaction channels and thereby assess their impact. The photodegradation rates for nanoplates dominated by {001} facets and nanocubes dominated by {012} facets were 0.13 and 0.7 h–1, respectively, and the turnover frequencies for the active sites on {001} and {012} were 7.89 × 10–3 and 3.07× 10–3 s–1, yielding apparent activation energies of 17.13 and 24.94 kcal/mol within the energetic span model, respectively. Facet-specific differences appear to be directly not linked with the simple aerial cation site density but instead with their extent of undercoordination. By establishing this linkage, the findings lay a foundation for predicting the photocatalytic degradation efficiency for the myriad of possible hematite nanoparticle morphologies and more broadly help unveil key reactions at the interface that may govern photocatalytic organic transformations in natural and engineered aquatic environments.

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Spatial and Temporal Distribution of Coloured Dissolved Organic Matter (CDOM) in Narragansett Bay, Rhode Island: Implications for Phytoplankton in Coastal Waters

Keith

Yoder

Freeman

2002

Estuarine, Coastal and Shelf Science

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Effects of solar ultraviolet radiation on biogeochemical dynamics in aquatic environments : report of a workshop, Marine Biological Laboratory, Woods Hole, Massachusetts, October 23-26, 1989

Cited by 6 publications

References 178 publications

Hydrophobic C18 Bound Organic Complexes of Chromium and Their Potential Impact on the Geochemistry of Cr in Natural Waters

Hydrophobic C18 Bound Organic Complexes of Chromium and Their Potential Impact on the Geochemistry of Cr in Natural Waters

Facet-Specific Photocatalytic Degradation of Organics by Heterogeneous Fenton Chemistry on Hematite Nanoparticles

Spatial and Temporal Distribution of Coloured Dissolved Organic Matter (CDOM) in Narragansett Bay, Rhode Island: Implications for Phytoplankton in Coastal Waters

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