Monodisperse-porous titania microspheres and their gold decorated forms as new photocatalysts for dye degradation in batch fashion

3D Printed Hydrogel-Based Sensors for Quantifying UV Exposure

“…The change in color of the printed sensors as a result of UV exposure was assessed by measuring the intensity of images taken using a mobile phone (Samsung Galaxy). To study the effect of UV exposure on the printed sensors, optimized sensors were placed under the mercury lamp, and images were taken at the following time intervals: 0, 2, 4, 6, 8, 10, 14,18,22,26,30,34,38,42,44,48,60,90, and 120 min. The change in color due to photodegradation of the dye was assessed by taking a picture of the sensors every minute.…”

“…The hydrogel uses biocompatible materials, alginate, and gelatin as a dispersion medium with optimized viscosity to enable one-step fabrication of compact, flexible, and mechanically stable constructs by printing. TiO 2 nanoparticles are known for their high photocatalytic activity, low cost, and nontoxicity. − TiO 2 is a commonly used ingredient in sunscreen formulations, self-cleaning surfaces, paint, and for water and air purification. ,− The TiO 2 photocatalytic abilities have been investigated as a possible treatment for wastewater, especially in waters with heavy dye pollution. − ,− TiO 2 decomposes organic materials by a series of photocatalytic reduction-oxidation chain reactions involving oxygen and hydroxyl radical generation, which are ultimately responsible for the oxidative degradation of the dye. ,,, Here, we explore a scaled-down version of this mechanism and use TiO 2 nanoparticles to initiate photocatalytic decomposition of strongly colored dyes [malachite green (MG), methyl orange (MO) and methylene blue (MB)] encapsulated within biocompatible hydrogels. The photocatalytic degradation mechanism of these dyes by TiO 2 is shown in the Supporting Information in Figure S1. − Although the photocatalytic degradation of dyes by TiO 2 is known, these have never been used in printable hydrogel formulations for portable UV sensing.…”

Au and AuCu Nanoparticles Supported on SBA-15 Ordered Mesoporous Titania-Silica as Catalysts for Methylene Blue Photodegradation

“…Although titania is, by far, one of the best photocatalysts, not only for its outstanding photocatalytic activity, but also because it is a widely spread, economical material, greatly thermal and chemically stable, and with no toxicity [ 10 , 11 , 12 ], its wide band gap (3.2 eV for the most active phase, anatase [ 13 ]) has limited its use to the UV region, which accounts for only ca. 5% of the total incident solar spectrum [ 14 ].…”