Design and Photocatalytic Properties of Semiconductor/Dye/Polymer thin Film Photocatalysts

• Published in: Chemical Engineering of Polymers Vol. 1; pp. 345 - 359
• Main Authors: Linnik, O., Nadtoka, O., Chorna, N., Smirnova, N., Syromyatnikov, V.
• Format: Book Chapter
• Language: English
• Published: Canada CRC Press 2018; Apple Academic Press, Incorporated
• Edition: 1
• Subjects: Industrial chemistry; Anatase TiO; polyepoxypropylcarbazole; Semiconductor Polymer; semiconductivity; Ultra Filtration; Visible Light Sensitivity; Visible Light Exposure; Lewis Surface Acidic Sites; Photo Catalytic Activity; DSC; Ay; Double Beam Spectrophotometer; Central Nervous System Alterations; Nanostructured TiO; photo catalysis; Apparent Crystallite Size; Tetracycline Degradation; Composite; XRD Spectrum; Mesoporous Thin Films; Ground Tire Rubber; dye; Polymethine Dyes; titania; TC Concentration; Lewis Acidic Sites; Mesoporous TiO; Charge Carrier Transfer; Polymer Ceramic Nanocomposites; Acidic Surface Sites
• ISBN: 1771884452; 9781771884457
• DOI: 10.1201/9781315365985-28

The semi conductive films contained 10 and 30% of TiO2 in titania/silica nanocomposite were synthesized by sol-gel method using concentrated anatase titania colloid. Acridine Yellow (AY) was adsorbed onto the surface from its aqueous solution. The film with adsorbed AY was covered by polyepoxypropylcarbazole(PEPC) dissolved in benzene. The semiconduc- tor/dye/polymer composites were tested for the stability in several solvents (water, ethanol/water mixtures and pure ethanol). The amount of adsorbed AY as well the concentration of PEPC influenced on the level of desorbed AY from the composites. Photo catalytic performance in the process of dichromate ions reduction and tetracycline degradation under UV and visible light was performed. Among tested materials, the most perspective photo catalytic system was the composite containing 10% TiO2/SiO2/AY/PEPC. Surface modification of titania or other semiconductors places a key role on the yield of photo induced electron transfer processes. Since 1980s, the photovoltaic investigation of nanostructured TiO2 observing the efficient charge injection from dyes into a conduction band of the semiconductor has been reported. Several polymethine dyes with indoline end groups were used to saturate Degussa P-25 titania with the following coating by polyepoxypropyl-carbazole to protect the dye molecules to be removed from the surface of titania. The active surface area and adsorption capacity to the molecular sensitizer are greatly increased in such systems resulting in an effective light absorption. The TiO2/SiO2/Acridine Yellow/polyepoxypropylcarbazole films can be used as the new type of photo catalytic systems in Ecological Photo catalysis as the significant increase in the photo activity under visible light for both reduction and destruction processes.