Photocatalytic Behavior of Water-Based Styrene-Acrylic Coatings Containing TiO2 Sensitized with Metal-Phthalocyanine Tetracarboxylic Acids

Abstract

Abstract:The study presents the results regarding the photocatalytic behavior of some water-based styrene-acrylic coatings containing TiO 2 nanoparticles sensitized with metal-phthalocyanine tetracarboxylic acids. Coating materials have been studied in terms of color characteristics, photocatalytic behavior, and resistance to self-degradation depending on the structure of phthalocyanine sensitizers. Coatings that were exposed to Xenon light showed degradation of the organic sensitizer rather than of the binder. Photocatalytic tests using methylene blue as a standard contaminant indicated that the coating containing TiO 2 nanoparticles sensitized with Fe(III) phthalocyanine tetracarboxylic acids showed the highest efficiency both in ultraviolet or visible light. In this case, the UV light induced a photodegradation rate that was greatly increased of about fifty times comparatively with that induced by LED light and was determined by two different mechanisms, but side reactions like methylene blue and sensitizer self destruction are possible to occur simultaneously. Photocatalytic materials of this type are suitable to be used as decorative coatings especially for indoor applications.

Influence of the Micro-Nanostructuring of Titanium Dioxide Films on the Photocatalytic Degradation of Formic Acid under UV Illumination

“…Its main advantages are its optical properties (a high refractive index, and transparency in the visible and NIR range) and its mechanical, physical and chemical properties (photocatalytic properties). The advantages of depositing TiO 2 coatings in the form of thin films have been demonstrated in many fields, including energy [ 11 ], photocatalysis [ 12 , 13 , 14 , 15 , 16 , 17 ], electronics [ 18 , 19 ], health [ 20 ], and optics [ 21 , 22 , 23 ]. Additionally, the coatings can be micro-nanostructured, thereby giving them new functionalities and properties, e.g., improved absorption efficiency [ 24 ], hydrophobicity and enhanced tribological properties [ 25 ].…”

Remediation of Fouling on Painted Steel Roofing via Solar Energy Assisted Photocatalytic Self‐Cleaning Technology: Recent Developments and Future Perspectives

“…Surface modification of photocatalytic particles is also used to control the photodegradation rates of binders and internal paint components to obtain long‐lasting performance. [ 140–142 ] Incorporation of an additional protective layer in between the underlying paint and photocatalytic top layer is another efficient approach of reducing photodegradation of underlying paint components that have been discussed in the later of this chapter.…”

Iron Oxide/Phosphatic Materials Composites with Potential Applications in Environmental Protection

“…The potential towards obtaining photocatalytic coatings using the synthesized materials was determined by a generally accepted method, namely UV-vis spectrometry, using methylene blue (MB) as a contaminant. For this experiment, the composite material (MnHAP-M) and the phosphatic material without the magnetic phase (MnHAP, used as reference to study the influence of the magnetic phase) were mixed separately with a styrene-acrylic film-forming material, prepared as previously described [27], using an automatic pigment muller machine (J. Engelsmann AG, Ludwigshafen am Rhein, Germany) in a ratio 1:19 (by weight), to a total weight of three grams [28]. The resulted materials were deposited on glass slides, having a thickness approximatively 50 ± 1 µm, then dried for 48 h. The glass slides were immersed in 30 mL of 1 g/L solution of MB, followed by drying for 2 h at 120 • C and underwent a light fastness testing procedure using a xenon discharge lamp with controlled irradiation (Atlas Xenotest 150S+, Atlas Material Testing Solutions, Mount Prospect, IL, USA).…”