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      Materials for selective photo-oxygenation vs. photocatalysis: preparation, properties and applications in environmental and health fields

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          Abstract

          Photosensitizing materials made of organic dyes embedded in various supports are compared to usual supported TiO 2-based photocatalysts.

          Abstract

          This perspective paper compares the properties and applications in the environmental and health fields of organic photosensitizers (embedded in solid organic or inorganic inert supports) and TiO 2-based photocatalysts. The basic principles of photosensitization and photocatalysis are recalled and the properties of the reactive oxygen species (ROS) produced under irradiation in both cases are reviewed. Various families of organic photosensitizers (PSs) and their immobilization on different supports are then described. The properties of these materials are summarized. A section is dedicated to their applications in fine chemistry, disinfection, photodynamic therapy (PDT), degradation of persistent pollutants in water and solvent-free oxygenation of selected chemicals. After a short reminder of the latest reviews on TiO 2-based photocatalysis, some selected applications of supported TiO 2materials are reported in the fields of water treatment, active photocatalytic indoor air remediation/disinfection and passive materials designed not only for self-cleaning but also for removal of air pollutants and microorganisms. Both types of materials are quite complementary and their advantages/drawbacks are highlighted. The selectivity and extended lifetime of singlet oxygen ( 1O 2) produced under visible light by PS-containing materials make them highly attractive for the selective oxygenation of persistent pollutants in wastewater containing complex matrices or for PDT. On the other hand, TiO 2-based photocatalysts have been devoted to the complete mineralization of pollutants. However, their use in a large field under visible irradiation is still to be developed.

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          Semiconductor-based photocatalytic hydrogen generation.

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            Understanding TiO2 photocatalysis: mechanisms and materials.

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              Recent advances in semiconductors for photocatalytic and photoelectrochemical water splitting.

              Photocatalytic and photoelectrochemical water splitting under irradiation by sunlight has received much attention for production of renewable hydrogen from water on a large scale. Many challenges still remain in improving energy conversion efficiency, such as utilizing longer-wavelength photons for hydrogen production, enhancing the reaction efficiency at any given wavelength, and increasing the lifetime of the semiconductor materials. This introductory review covers the fundamental aspects of photocatalytic and photoelectrochemical water splitting. Controlling the semiconducting properties of photocatalysts and photoelectrode materials is the primary concern in developing materials for solar water splitting, because they determine how much photoexcitation occurs in a semiconductor under solar illumination and how many photoexcited carriers reach the surface where water splitting takes place. Given a specific semiconductor material, surface modifications are important not only to activate the semiconductor for water splitting but also to facilitate charge separation and to upgrade the stability of the material under photoexcitation. In addition, reducing resistance loss and forming p-n junction have a significant impact on the efficiency of photoelectrochemical water splitting. Correct evaluation of the photocatalytic and photoelectrochemical activity for water splitting is becoming more important in enabling an accurate comparison of a number of studies based on different systems. In the latter part, recent advances in the water splitting reaction under visible light will be presented with a focus on non-oxide semiconductor materials to give an overview of the various problems and solutions.
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                Author and article information

                Journal
                CSTAGD
                Catalysis Science & Technology
                Catal. Sci. Technol.
                Royal Society of Chemistry (RSC)
                2044-4753
                2044-4761
                2016
                2016
                : 6
                : 6
                : 1571-1592
                Affiliations
                [1 ]IPREM UMR CNRS 5254
                [2 ]Université de Pau et des Pays de l'Adour
                [3 ]64053 Pau Cedex
                [4 ]France
                Article
                10.1039/C5CY01929J
                dff66c16-7d7c-4196-b277-87127d9d8051
                © 2016
                History

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