Fabrication of CdSe Nanoparticles Sensitized Long TiO₂ Nanotube Arrays for Photocatalytic Degradation of Anthracene-9-carbonxylic Acid under Green Monochromatic Light

Abstract

CdSe nanoparticles with well dispersion were decorated on inner and outer surfaces of 4 μm long TiO2 nanotubes through a simple direct current electrotechnique, resulting in a composite functional material with a perfect construction. The applied depositing voltage plays a determinative role during the CdSe nanoparticles formation process, getting through the breakdown potential of TiO2 and providing intense active sites for the CdSe crystal growth on the TiO2 nanotubes. The CdSe/TiO2 composite nanotube arrays exhibit high absorption in the visible light region due to the narrow band gap of CdSe, and depict sensitive photoelectrochemical response under visible light illumination. Photocatalytic degradation of anthracene-9-carbonxylic acid (ACA), one of the derivants of persistent organic pollutants (POPs), was successfully achieved on CdSe/TiO2 nanotubes when exposed to the 550 nm green monochromatic light.

A facile synthesis of CdSe quantum dots-decorated anatase TiO2 with exposed {0 0 1} facets and its superior photocatalytic activity

“…Especially for semiconductor quantum dots (QDs) decorated T001, the fast diffusion of charge carriers across the interface will cause the rapid charge transfer between QDs and T001, leading to the greatly enhanced photocatalytic activity [24][25][26]. Due to the obvious quantum size effect, strong capability for visible light absorption and well matched energy band position with TiO 2 , CdSe QDs has been extensively employed to couple with TiO 2 in the field of photoelectrochemical devices, solar cells and photocatalysis [27][28][29][30][31][32][33][34]. However, to the best of our knowledge, the work on coupling T001 with CdSe QDs in photocatalytic field has not been reported up to now.…”

Uniformly dispersed CdS/CdSe quantum dots co-sensitized TiO2 nanotube arrays with high photocatalytic property under visible light

“…Electrodeposition of CdSe QDs: CdSe QDs were deposited on the samples by electrochemical method [16] using a three-electrode with the CdS/TiO 2 -NTAs as working electrode, a Ag/AgCl electrode as reference electrode, and a graphite plate counter electrode in electrolyte solution containing 0.02 M CdCl 2 , 2 mM SeO 2 , and 0.02 M Na 2 SO 4 . Electrodeposition was carried out at a voltage of À 0.7 V for 500 s. After deposition the samples were washed several times with ultrapure water then dried in air, annealed in Ar atmosphere at 350 1C for 2 h with heating and cooling rate of 1 1C/min.…”

Fabrication of high-performance CuInSe2 nanocrystals-modified TiO2 NTs for photocatalytic degradation applications

“…The former is a widely used herbicide/pesticide [5] with a high level of toxicity [6]. The latter is toxic to the epithelium, inhibiting transport that in turn increases the permeability of the paracellular pathway [7]. It is difficult to remove them due to its high chemical stability.…”