Nanocrystalline TiO2 Composite Films for the Photodegradation of Formaldehyde and Oxytetracycline under Visible Light Irradiation

Abstract

In order to effectively photodegradate organic pollutants, ZnO composite and Co-B codoped TiO2 films were successfully deposited on glass substrates via a modified sol-gel method and a controllable dip-coating technique. Combining with UV–Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL) analyses, the multi-modification could not only extend the optical response of TiO2 to visible light region but also decrease the recombination rate of electron-hole pairs. XRD results revealed that the multi-modified TiO2 film had an anatase-brookite biphase heterostructure. FE-SEM results indicated that the multi-modified TiO2 film without cracks was composed of smaller round-like nanoparticles compared to pure TiO2. BET surface area results showed that the specific surface area of pure TiO2 and the multi-modified TiO2 sample was 47.8 and 115.8 m2/g, respectively. By degradation of formaldehyde and oxytetracycline, experimental results showed that the multi-modified TiO2 film had excellent photodegradation performance under visible light irradiation.

Synthesis of TiO2 with Hierarchical Porosity for the Photooxidation of Propene

“…However, heterogeneous photocatalytic oxidation (PCO) is a novel way to eliminate this pollutant because it can be performed at room temperature and at atmospheric pressures [ 7 ]. A wide variety of semiconductors has been studied as photocatalysts, such as ZnO [ 8 ], CdS [ 9 ] and, most noticeably, TiO 2 [ 10 , 11 , 12 ].…”

A Novel Approach to Augment the Opto-Electronic Properties of Stannic Oxide (SnO2) Thin Films by Vanadium Doping

“…Its high chemical stability is considered to be an inherent advantage of SnO2 [10] and it makes SnO2 appreciably adoptable for applications in challenging atmosphere, for preparing transparent and strong-conductive electrode on photo enabled electrodes or as a selectively solar energy penetration coating [11,12]. Its applications include surface coatings, environmental and human health [13] gas sensors [14] organic pollutants and toxic water [15] and heterojunction catalysts [16], Tin dioxide (SnO2), having lattice parameters a = b = 4.737 Å and c = 3.826 Å with tetragonal Rutile structure is an important n-type semiconductor. Each tin atom at the corners of a regular octahedron is bounded to six oxygen atoms and three tin atoms surround each oxygen atom [17].…”

Effect of Vanadium on Structure and Morphology of SnO2 Thin Films

“…The process of doping metal oxides semiconductors with the transition metals of the second group in the periodic table or their ions is considered as an important and interesting subject in many fields of applications [1], such as gas sensors [2], surface coatings, environmental and human health [3], organic pollutants and toxic water [4], photocatalysis [5], probe reaction to evaluate the catalytic activity [6], and nanocomposite or heterojunction catalysts [7]. Where a small amount of material from the transition group can have a significant and a clear effect on the properties of surface electrical conductivity [8].…”