Effect of the sonication and coating time on the photocatalytic degradation of TiO₂, TiO₂-Ag, and TiO₂-ZnO thin film photocatalysts

Development of Multifunctional Coatings for Protecting Stones and Lime Mortars of the Architectural Heritage

“…In this way, the water vapor is not accumulated in the treated masonry, and protection is achieved without sealing. The active nanoparticles of the photocatalyst are heterostructures of TiO 2 -ZnO, 50/50 and 10/90 (synthesised by Flame Spray Pyrolysis, FSP), which are expected to be more active than TiO 2 under UV and visible radiation as well (literature provides many examples of the effectiveness of heterojunction photocatalysts, synthesized by the combination of two or more oxides (Wang et al 2014;Liu et al 2017;Low et al 2017;Thakur et al 2018;Lee et al 2019;Šutka, Järvekülg and Gross 2019;Ungan and Tekin 2019). Besides, different dispersing agents were also used to modify the nature of the coatings in order to avoid the foreseeable agglomeration of the photocatalytic nanoparticles which would have a negative impact on their effectiveness.…”

Synergistic Hybridization of Twin-Induced Red/Black Phosphorus and Tungsten Oxide as Homo–Hetero Dynamic Dual Junctions for Z-Scheme CO2 Photoreduction

“…It is noteworthy to mention that P-based and WO 3 photocatalysts possess high hydrophilicity; , hence, DMSO is a suitable solvent to increase the dispersion of RP/BP and WO 3 . The ultrasonic waves induced by acoustic cavitation in sonochemical synthesis allowed the photocatalyst particles to be uniformly dispersed in the DMSO solvent during the sonication process, leading to the formation of a homogeneous RP/BP and WO 3 photocatalyst mixture, and assisted in the reduction of agglomeration between the particles . Consequently, intimate interactions and new bonds between RP/BP and WO 3 were formed which successfully led to the development of RP/BP@WO 3 homo–hetero junction photocatalytic systems, as evidenced by the results obtained from several characterization assessments such as TEM, XRD, and XPS analysis, which are discussed in the succeeding sections.…”

“…18 The ultrasonic waves induced by acoustic cavitation in sonochemical synthesis allowed the photocatalyst particles to be uniformly dispersed in the DMSO solvent during the sonication process, leading to the formation of a homogeneous RP/BP and WO 3 photocatalyst mixture, and assisted in the reduction of agglomeration between the particles. 19 Consequently, intimate interactions and new bonds between RP/BP and WO 3 were formed which successfully led to the development of RP/BP@WO 3 homo− hetero junction photocatalytic systems, as evidenced by the results obtained from several characterization assessments such as TEM, XRD, and XPS analysis, which are discussed in the succeeding sections. The synthesis mechanism for RP/BP and the ternary RP/BP@WO 3 system by a facile solvothermal and sonochemical-assisted self-assembly route is schematically represented in Figure 1.…”

Photocatalytic Performance and Mechanism Research of Ag/HSTiO2 on Degradation of Methyl Orange

“…For the past few years, economic development and industrialization lead the rapid improvement of people’s living standards. − At the same time, they also expose serious environmental pollution problems, leading to environmental degradation, threatening human health and impeding sustainable development. − However, the development of science and technology results from the improvement of the semiconductor photocatalytic technology, which becomes a hot spot in research and can effectively solve these problems …”