Bromate removal from drinking water by semiconductor photocatalysis

The semiconductor photocatalyst, platinised titanium dioxide, Pt/TiO2, is used to promote the destruction of bromate ions to bromide and oxygen by 254 nm ultraviolet light. The kinetics of bromate removal are first order with respect to [BrO3-] and are inhibited, although not completely, by competitive adsorption by other anions, including bromide and sulfate ions. The Pt/TiO2 can be used not only as a powder dispersion, but also as a thin film in a flow reactor for the destruction of bromate ions. Copyright (C) 1996 Elsevier Science Ltd

ACTIVATION-ENERGIES IN SEMICONDUCTOR PHOTOCATALYSIS FOR WATER-PURIFICATION - THE 4-CHLOROPHENOL TIO2 O-2 PHOTOSYSTEM

The variation in the activation energy for the initial stage of photomineralization of 4-chlorophenol (4-CP), sensitized by Degussa P25 TiO2 was investigated as a function of P-O2 and [4-CP]. A model was developed based on the incorporation of Arrhenius-type functions in a general rate equation for the initial stage of photomineralization. Values of the essential constants in the model were derived from a few simple experiments. Positive, negative and zero apparent activation energies were predicted using the model, and verified experimentally, under moderate reaction conditions. The general applicability of the model is briefly discussed.

WATER-PURIFICATION BY SEMICONDUCTOR PHOTOCATALYSIS

The basic principles of the photooxidative mineralization of organic pollutants by O2, sensitized by TiO2, are described. The kinetics of this process as a function of [TiO2], [organic pollutant], [O2], light intensity, temperature, pH, and the type of anion present are discussed, and a general kinetic model is presented. Standard test and demonstration systems for water purification by TiO2 photocatalysis are described and other novel applications of semiconductor photocatalysis are outlined.

Draft Genome Sequence of an Antibiotic-Resistant Propionibacterium acnes Strain, PRP-38, from the Novel Type IC Cluster

Propionibacterium acnes, a non-spore-forming, anaerobic Gram-positive bacterium, is most notably recognized for its association with acne vulgaris (I. Kurokawa et al., Exp. Dermatol. 18:821–832, 2009). We now present the draft genome sequence of an antibiotic-resistantP. acnesstrain, PRP-38, isolated from an acne patient in the United Kingdom and belonging to the novel type IC cluster. Copyright © 2012, American Society for Microbiology. All Rights Reserved.