Journal ArticleDOI
Enhancement of the rate of solar photocatalytic mineralization of organic pollutants by inorganic oxidizing species
TLDR
In this article, a solar photocatalytic plant for the treatment of commercial pesticide rinsates found in the wastewater produced by a pesticide container recycling plant, which includes the correct treatment of this highly contaminating effluent.Abstract:
Particulate suspensions of TiO2 irradiated with natural solar light in a large experimental plant catalyze the oxidation of a typical organic contaminant: pentachlorophenol (PCP). The addition of oxidants, concentration of which is kept constant during treatment, such as hydrogen peroxide, peroxymonosulphate (oxone) and peroxydisulphate increases the rate of photodegradation of PCP in the following order: S2O2−8>Oxone>H2O2. Peroxydisulphate (10 mM), selected as the best oxidant studied, has been applied to the development of a solar photocatalytic plant for the treatment of commercial pesticide rinsates found in the wastewater produced by a pesticide container recycling plant, which includes the correct treatment of this highly contaminating effluent. The first results, without process or hardware optimisation, show that peroxydisulphate enhances the photocatalytic mineralization rate at least five times.read more
Citations
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TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations A review
TL;DR: In this article, the photocatalytic degradation of azo dyes containing different functionalities has been reviewed using TiO2 as photocatalyst in aqueous solution under solar and UV irradiation.
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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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Degradation of organic contaminants in water with sulfate radicals generated by the conjunction of peroxymonosulfate with cobalt.
TL;DR: The advantage of Co/PMS compared to the traditional Fenton Reagent is attributed primarily to the oxidizing strength of the radicals formed, since sulfate radicals are stronger oxidants than hydroxyl and the thermodynamics of the transition-metal-oxidant coupling.
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Parabolic-trough solar collectors and their applications
TL;DR: An overview of the parabolic-trough collectors that have been built and marketed during the past century, as well as the prototypes currently under development can be found in this paper.
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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.
References
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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.
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Photocatalysis on TiO2 Surfaces - Principles, Mechanisms, and Selected Results
TL;DR: In this article, the authors focus on interfacial processes and summarize some of the operating principles of heterogeneous photocatalysis systems, including the electron transfer and energy transfer processes in photocatalytic reactions.
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Water-purification by semiconductor photocatalysis
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Photocatalyzed destruction of water contaminants
TL;DR: Heterogeneous photocatalysis is a process in which the illumination of an oxide semiconductor, usually the anatase form of titanium dioxide, produces photoexcited electrons (e{sup {minus}}) and holes (h{sup +}). These can migrate to the oxide surface and participate in halfcell reactions that are part of a closed, catalytic cycle as mentioned in this paper.
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Rate constants and mechanism of reaction of sulfate radical anion with aromatic compounds
TL;DR: In this paper, the exact rate constants for.SO/sub 4/sup -/ with substituted benzenes and benzoates have been determined by pulse radiolysis.