Fabrication of TiO₂/CdS Heterostructure by Soluble Solid-State Titanium-oxo-Clusters for Fast Photocatalytic Degradation of Tetracycline

Abstract

Dependent on the solubility of titanium-oxoclusters, the molar ratios of Ti/Cd in the composite can be adjusted precisely. Herein, a soluble solid-state titanium-oxocluster is employed as a Ti raw reactant to fabricate a TiO 2 /CdS photocatalyst with TiO 2 nanoparticles isolated on the surface of CdS nanorods for highly efficient degradation of tetracycline (TC). The comparative experiment shows that the composite with the Ti/Cd molar ratio at 0.5 exhibits the best photocatalytic performance, which can degrade 95% TC with an initial concentration of 10 mg/L under 12 min visible-light irradiation. The excellent photocatalytic ability of the TiO 2 /CdS composites made of soluble titanium-oxo-clusters is superior to those of the pure CdS and TiO 2 , which is attributed to not only the synergic effect of TiO 2 /CdS heterostructure on improvement of photogenerated electron−hole pairs' separation and lifetime but also the ideal dispersion of the isolated TiO 2 nanoparticles on the surface of CdS nanorods. This work presents a facile way to achieve a highly active catalyst with controllable TiO 2 -involved heterostructure for photocatalytic degradation.

Donor–Acceptor-Conjugated Porous Polymer for Photopromoted N–H Formylation of Secondary Amines: Efficient In Situ N-Heterocyclic Carbene Catalysis in Radical Manner

“…Acetaldehyde, a 2B carcinogen, is one of the third-class disinfection byproducts of drinking water, and the presence of acetaldehyde pollutants also can be observed in industrial wastewater, exhaust gas, automobile exhaust, and decorative wood . Photodegradation is a prevalent technique for the removal of acetaldehyde pollutants, utilizing semiconductor metal oxides (such as TiO 2 , , WO 3 , and CeO 2 ) as catalysts. Unfortunately, the degradation products primarily consist of CO 2 , HX, and water, and the value-added utilization of acetaldehydes remains unrealized .…”

Urchin-like TiO2/CdS Nanoparticles Forming an S-scheme Heterojunction for Photocatalytic Hydrogen Production and CO2 Reduction

“…To investigate the photocatalytic mechanism, the Mott–Schottky curves of samples T and CE were tested, and it can be found that the slopes of the MS curves of T versus CE are positive at different frequencies (500, 1000, and 1500 Hz), which indicates that our prepared TiO 2 with CdS is a typical n-type semiconductor. The flat-band potentials of T and CE were obtained from the tangent intercepts of the MS curves on the x -axis as −0.53 and −0.73 V (vs Ag/AgCl, pH = 7) (Figure c,d), and the conduction-band (CB) potentials of the n-type semiconductors in general are lower than the flat-band (FB) potentials by 0.1–0.3 eV; it is then based on eqs and : E ( NHE ) = E ( Ag / Ag Cl ) + 0.197 E CB = E VB − E g …”

Promoting water-splitting reaction on TiO2/gCN with Pd/SrO cocatalysts: H2 evolution in the absence of a sacrificial reagent

“…Several methodologies have been developed to address this challenge, e.g., metal oxide coating, 33 manufacturing of core-shell microspheres, 34 neutral network construction, 35 layering visible spectrum active photosensitizers, 36 and fabrication of heterostructures. 37 The loading/doping of metallic and non-metallic elements increases the charge separation and enhances the hydrogen production efficiency of photocatalysts by generating active sites. 38 Graphitic carbon nitride (gCN) is a 2D metal-free polymeric material 39 consisting of tris-triazine-based patterns (sp 2 hybridized, C/N = 3/4) with a sophisticated band gap (E g = 2.67 eV).…”