Journal ArticleDOI
Photocatalytic decomposition of triclopyr over aqueous semiconductor suspensions
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In this article, the photocatalytic degradation of trichloro-2pyridinyloxyacetic acid (Triclopyr), a pyridine analogue of the phenoxy herbicides, has been investigated in aqueous heterogeneous solutions containing TiO2 or ZnO as photocatalyst.Abstract:
The photocatalytic degradation of 3,5,6-trichloro-2-pyridinyloxyacetic acid (Triclopyr), a pyridine analogue of the phenoxy herbicides, has been investigated in aqueous heterogeneous solutions containing TiO2 or ZnO as photocatalyst. The disappearance of the organic molecule follows approximately a pseudo-first kinetic order according to the Langmuir-Hinselwood model. As mineralization products, CO2 and Cl− ions have been identified, whereas the nitrogen atom forms only NH4+ ions. Various commercial photocatalysts were compared with respect to their overall efficiency, as well as the production of CO2. The effect of pH and H2O2 on the reaction rate was ascertained. The photooxidation of Triclopyr has also been monitored with FTIR spectroscopy.read more
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Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends
TL;DR: In this article, the authors reviewed the use of sunlight to produce the OH radicals by TiO2 photocatalysis and photo-Fenton process and summarized most of the research carried out related to solar photocatalytic degradation of water contaminants and how it could significantly contribute to the treatment of persistent toxic compounds.
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Development of alternative photocatalysts to TiO2: Challenges and opportunities
TL;DR: In this article, the main achievements obtained with photocatalyst alternatives to TiO2 in the three main niches for this technology are summarized, with an historical perspective, in order to assess which of the photoactive materials are best for each particular application.
Journal ArticleDOI
A survey of photocatalytic materials for environmental remediation.
TL;DR: This review illustrates the efforts in the search of alternative photocatalysts that are not based on TiO(2), with some exceptions concerning particularly innovative modifications as nanoassembled TiO-based composites with active carbon, graphite and fullerene.
Journal ArticleDOI
Photocatalysis with solar energy at a pilot-plant scale: an overview
TL;DR: In this article, the experimental systems necessary for performing pilot-plant scale solar photocatalytic experiments are described, as well as the basic components of these pilot plants and the fundamental parameters related to solar photochemical reactions.
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Zinc oxide based photocatalysis: tailoring surface-bulk structure and related interfacial charge carrier dynamics for better environmental applications
TL;DR: In this article, the performance of zinc oxide (ZnO) has been improved by tailoring its surface-bulk structure and altering its photogenerated charge transfer pathways with an intention to inhibit the surfacebulk charge carrier recombination.
References
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Journal ArticleDOI
Environmental Applications of Semiconductor Photocatalysis
TL;DR: The slow pace of hazardous waste remediation at military installations around the world is causing a serious delay in conversion of many of these facilities to civilian uses as discussed by the authors, which is a serious problem.
Book
Infrared and Raman Spectra of Inorganic and Coordination Compounds
TL;DR: In this article, the normal modes of vibration are illustrated and corresponding vibrational frequencies are listed for each type, including diatomic, triatomic, fouratomic, five-atomic, six-atomic and seven-atomic types.
Journal ArticleDOI
Photocatalytic degradation of organic water contaminants: Mechanisms involving hydroxyl radical attack
Craig S. Turchi,David F. Ollis +1 more
TL;DR: In this article, it is proposed that the hydroxyl radical, OH·, is the primary oxidant in the photocatalytic system and four possible mechanisms are suggested, all based on OH· attack of the organic reactant.