Nano/microsized TiO₂ composite photocatalysts for environmental purification

Abstract

TiO 2 photocatalyst is one of the most important photocatalysts for practical use owing to its low toxicity, high chemical stability, natural abundance, and strong oxidation power. However, its low quantum efficiency which is derived from fast electron-charge recombination and its low decomposition rate against organic compounds in low concentration and/or low affinity for TiO 2 surface is problematic for environmental purification. To overcome these problems, functionalized photocatalysts that have a nano/microsized structure were prepared by combining TiO 2 and other materials in our study. A Z-scheme photocatalyst thin film, a TiO 2 -coated porous glass composite with high adsorption capacity, and a TiO 2 -coated stainless mesh for electric field-assisted photocatalysis were prepared using liquid and colloidal processes. This study reports the photocatalytic properties of these composites in air and water environments and their decomposition mechanisms.

TiO2 based nanopowder coatings over stainless steel plates for UV‐C photocatalytic degradation of methylene blue

“…UV/photocatalyst assisted AOP is a heterogeneous photocatalysis process, which relies on five independent steps: (a) transportation of reactants; (b) reactants adsorption on catalyst; (c) reaction itself; (d) desorption of the products; and (e) and the removal of the products . As the adsorption step is vital, research has been focused on how to increase the photocatalyst surface area . Higher surface roughness, or increased surface wettability, may help; however, this may also result in adverse microgeometry or morphology for light absorption, since UV lights have a diffusive emission character (ie, direction and strength change with distances) …”

A machine learning-based nano-photocatalyst module for accelerating the design of Bi2WO6/MIL-53(Al) nanocomposites with enhanced photocatalytic activity

“…Photocatalysis technology has been applied in many frontier elds, such as environmental purication, 11,12 self-cleaning materials, 13 advanced new energy, 14,15 cancer treatment, 16 high-efficiency antibacterial agents, 17 etc. Especially, the visiblelight photocatalysts have become part of mainstream research in the environmental protection eld [18][19][20] because they can utilize approximately 50% solar energy, well above the nanosemiconductor materials.…”

Platinum Decorated Titanium Dioxide Nanosheets for Efficient Photoelectroca-talytic HER

“…Over the past decades, anatase titanium dioxide has been proven to be a prospective candidate for photoelectric catalysis, considering its relatively high catalytic preference, low toxicity, excellent stability, cost-effectiveness and appropriate band gap [6][7][8][9] . Meanwhile, many researchers demonstrated that the morphology characteristics of titania have a significant or even decisive impact on its catalytic performance.…”