Thermally stable SiO₂@TiO₂ core@shell nanoparticles for application in photocatalytic self-cleaning ceramic tiles

Abstract

Photocatalyst-coated self-cleaning ceramic tiles are in high demand for indoor and outdoor applications aimed at keeping a clean environment. Their industrial processing, however, often re-quires firing at temperature (1000–1200 °C)...

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

“…3). The support or core material can be (photo)active [17,[24][25][26] or inert [27][28][29][30], inorganic or organic/polymeric [17,29,[31][32][33][34], and even magnetic [35,36]. The different methods used to immobilize TiO 2 on various supports have been reviewed in Ref.…”

“…Once suitable supports are used, the supported nanostructured photocatalyst systems offer several advantages, including better dispersion and reduced agglomeration, enhanced surface area, easy handling and recovery, and improved recyclability of the photocatalyst particles [30,33]. Moreover, as discussed in the following sections, the supported photocatalytic materials' optical, thermal, and photocatalytic properties can be modified, and often improved, owing to different support-photocatalyst interactions [27,29,[38][39][40][41]. While the improved physiochemical properties of supported nanostructured photocatalyst arising from support-photocatalysts interactions have been the subject of many studies [12,27,29,38,[40][41][42], comprehensive reviews highlighting the important supportphotocatalysts interactions are uncommon in published literature.…”

“…Moreover, as discussed in the following sections, the supported photocatalytic materials' optical, thermal, and photocatalytic properties can be modified, and often improved, owing to different support-photocatalyst interactions [27,29,[38][39][40][41]. While the improved physiochemical properties of supported nanostructured photocatalyst arising from support-photocatalysts interactions have been the subject of many studies [12,27,29,38,[40][41][42], comprehensive reviews highlighting the important supportphotocatalysts interactions are uncommon in published literature. This review article thus provides an updated viewpoint on the photocatalyst-support interactions and the resulting unique physiochemical properties significant for diverse photochemical applications and the design of practical devices.…”

Photocatalytic Activity in the In-Flow Degradation of NO on Porous TiO2–Coated Glasses from Hybrid Inorganic–Organic Thin Films Prepared by a Combined ALD/MLD Deposition Strategy

“…Previously, the glasses were washed with water and soap and dried on an absorbent paper. The SiO 2 coating plays a multifaceted role, as it inhibits the diffusion of alkaline ions from the glass substrate to the photocatalytic coating during the annealing process [45,52], provides thermal stability to the supported TiO 2 via the formation of covalent Ti-O-Si bonds [22], while it prevents agglomeration, phase transformation and assist the adsorption process, increasing optical path length [53].…”

“…The physical and chemical properties of TiO 2 depend on the structural parameters of each polymorph, which determines the photocatalytic activity of the material. TiO 2 -anatase shows better catalytic performance than TiO 2 -rutile due to (i) its higher electron mobility [22], (ii) greater number of active sites (oxygen vacancies), and (iii) the broader band-gap of anatase (3.20 eV for anatase and 3.02 eV for rutile), which results in a slightly superior redox capability [23]. The photocatalytic activity of TiO 2 -anatase may be improved by increasing the porosity of the material [24].…”