Broadband Photocatalytic Activity of Mesoporous Cd(II)‐Doped TiO₂

Abstract

Mesoporous Cd(II)‐doped TiO2 nanoparticles are prepared with various Cd contents through a micelle‐mediated hydrothermal method. The as‐prepared 5 %‐Cd(II) doped TiO2 photocatalysts possess highly organized crystallites with large surface area of 389.05 m2/g, and further display the broadband absorption capability extended toward visible region. The involving photocatalytic phenomena of degrading two kinds of non‐biodegradable azo dyes, Remazol Black 5 and Remazol Brilliant Orange 3R, were kinetically modeled, manifesting the fact that the involving photo‐degradation of these different dyes is in accordance with the second‐order kinetic model. With the optimized doping of Cd ions, the photocatalysts possess the tailored mesoporous architectures, leaving the substantially active sites in photocatlytic processs, along with efficient charge separation of photogenerated carriers due to additional trap levels in TiO2 band structures, further provide the improved capability of dye removal.

Hydrothermally Treating High-Ti Cinder for a Near Full-Sunlight-Driven Photocatalyst toward Highly Efficient H2 Evolution

“…However, a large band gap (3.2 eV) of anatase TiO 2 restricts its use in a narrow light-response range of ultraviolet (only about 3–5% of total sunlight) . The need for effective utilization of solar energy stimulates the ongoing research toward visible-light responsive TiO 2 . , One strategy to prepare visible light-activated TiO 2 is to dope with metal elements such as Cu, Sn, Ni, Cr, Mn, Mo, Nb, V, Fe, Ti 3+ , Cd, Gd, Ce, Ru, Au, Ag, Pt, and so on. − Most metal-ion doped TiO 2 photocatalysts have been used for photocatalytic degradation. Nevertheless, from the viewpoint of the Gibbs free energy change, photocatalytic water splitting and photocatalytic degradation reactions are totally different from each other .…”