The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Wojciech Macyk - One of the best experts on this subject based on the ideXlab platform.
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photosensitized tio2 films on polymers titania polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafal Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
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Photosensitized TiO2 films on polymers – Titania-polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafał Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
Anna Wach - One of the best experts on this subject based on the ideXlab platform.
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photosensitized tio2 films on polymers titania polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafal Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
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Photosensitized TiO2 films on polymers – Titania-polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafał Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
Marta Buchalska - One of the best experts on this subject based on the ideXlab platform.
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photosensitized tio2 films on polymers titania polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafal Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
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Photosensitized TiO2 films on polymers – Titania-polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafał Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
Piotr Kuśtrowski - One of the best experts on this subject based on the ideXlab platform.
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photosensitized tio2 films on polymers titania polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafal Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
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Photosensitized TiO2 films on polymers – Titania-polymer interactions and visible light induced photoactivity
Applied Surface Science, 2019Co-Authors: Rafał Sadowski, Anna Wach, Marta Buchalska, Piotr Kuśtrowski, Wojciech MacykAbstract:Abstract Photocatalytic coatings at polymers, showing a visible light induced photoactivity, can be synthesized using a low temperature oxygen plasma treatment of the polymer (PP) followed by deposition of TiO2 nanoparticles and their sensitization with organic ligands. The whole process consists of three major steps: Surface activation involving its partial oxidation, immobilization of TiO2 nanoparticles and photosensitization of titania film by impregnation with the solution of organic ligands Forming Surface Ti(IV) charge transfer complexes. XPS and IR analysis revealed the formation of oxygen-containing groups at the polymer Surface upon plasma treatment. These groups participate in the formation of Ti O C bonds which ensure a very good adhesion of titania films to polymeric Surface. The dip-coating process using an aqueous colloidal solution of TiO2 nanoparticles allows to synthesize a compact coating with a thickness of 100–300 nm. Coordination of catechol-like ligands to Surface Ti(IV) centers results in formation of colored charge transfer complexes responsible for absorption of visible light and an effective photoinduced charge separation. Photogenerated electrons and holes can take part in Surface redox reactions responsible for degradation of pollutants. Tests with various organic ligands (catechol, 2,3-naphthalenediol, pyrogallol and rutin) revealed, that the titanium dioxide coating modified with catechol was the most photoactive one when visible light irradiation was applied. Presented photocatalytic coatings can be effectively used as self-sterilizing Surfaces activated by visible light.
J. Pablo - One of the best experts on this subject based on the ideXlab platform.
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Uranium speciation in river sediments contaminated by phosphate ores
Environmental Chemistry Letters, 2012Co-Authors: S. Meca, J. Giménez, I. Casas, V. Martí, J. PabloAbstract:Large amounts of phosphate ores with high concentrations of uranium were dumped by a phosphate plant into the Flix water reservoir in the Ebre River, Catalonia, NE Spain. These phosphate wastes have been mixed over the years with effluents from other industries as well as with the sediments of the river, resulting in a complex mixture of solid wastes and sediments. No investigations on uranium speciation in such sediments were made because of the complexity of the sediments composition as well as the relatively low uranium content. However, these studies are necessary in order to predict the release of the uranium to the river waters. Here, we studied uranium speciation in sediments from two sampling points of the Flix water reservoir and at depths from 5 to 113 cm. We used room temperature time-resolved laser fluorescence spectroscopy and a three-step sequential extraction procedure described by the Standards, Measurements, and Testing Programme of the European Union. We found that uranium was mainly present in the sediment samples as meta-autunite [Ca(UO_2)_2(PO_4)_2·10–12H_2O], whose low solubility will result in a low release of uranium to the river waters. In addition, we found that some uranium was linked to sediments by Forming Surface complexes. We therefore made the first study of uranium speciation in the sediments of the Flix water reservoir.