Photoreduction of iron oxyhydroxides and the photooxidation of halogenated acetic acids

Article Abstract:

A study was conducted to investigate the behavior of ferrihydrite, lepidocrocite, goethite, hematite, maghemite and iron-containing aerosols when exposed to halogenated acetic acids. Results showed fast rates of photoreduction of Fe (III) to Fe (II) when ferrihydrite was the electron acceptor and flouroacetic acid as the electron donor. Photolytic reduction proceeded fastest in the presence of flouroacetic acid, at a moderate rate in the presence of monohaloacetic acids and the slowest rate in the presence of trihaloacetic acids.

Atmospheric chemistry, Oxidation-reduction reaction, Oxidation-reduction reactions, Iron compounds, Halogenation

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Simultaneous spectrophotometric measurement of Fe(II) and Fe(III) in atmospheric water

Article Abstract:

Researchers at W.M. Keck Laboratories have developed a new spectrophotometric method for detecting iron(II) and iron(III) in cloudwater. The technique uses di-2-pyridyl ketone benzoylhydrazone as a colorimetric chelating agent. Ascertaining the oxidation state of iron in cloudwater is important since iron may limit phytoplankton growth in oceans. Iron is also a catalyst in the autoxidation of SO2 to SO4 in clouds. Experimental procedures and results are described in detail.

Testing laboratories, Environmental aspects, Pollutants, Iron, Iron (Metal), Water vapor, Atmospheric, Atmospheric water

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Development and optimization of a TiO2-coated fiber-optic cable reactor: photocatalytic degradation of 4-chlorophenol

Article Abstract:

A fixed-bed photocatalytic reactor system that employs a fiber-optic cable was constructed to eliminate the problems encountered when using metal oxide semiconductors as photocatalysts. It improved light-utilization efficiencies, increased degree of light absorption by the support matrix, minimized heat buildup and eliminated delamination problems in the coating.

Management, Usage, Innovations, Equipment and supplies, Pollution, Heterogeneous catalysis, Photochemistry, Metal oxide semiconductors

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