Abstract
As a new and emerging technology, photocatalytic oxidation is widely used in the fields of sewage treatment and organic pollution control. In this study, CdS nanoparticles were prepared at room temperature by an innovative preparation method, then TiO2 nanorod–CdS nanoparticle heterojunction photocatalysts were prepared using the solvothermal method, with TiCl3 used as the precursor for TiO2 nanorods. This study mainly took advantage of the small size of the CdS nanoparticles in combination with TiO2 nanorods, and the resultant heterojunctions had large specific surface areas, thereby increasing the contact area between the catalysts and the contaminants. In addition, due to the lower band gap energy (2.4 eV) of CdS, the photo response range of the heterojunction photocatalysts was also increased. In an experimental study, through photocatalytic performance tests of the catalysts with different weight ratios, it was found that the TiO2(40%)@CdS composite had the best photocatalytic performance and the highest catalytic rate. BET, SEM, and other tests showed that the specific surface area of the TiO2(40%)@CdS composite was the largest. TiO2 nanorods and CdS particles were uniformly distributed in the composite, and the optical response range was extended to the visible light region.
Highlights
The photocatalytic activity of titanium dioxide (TiO2 ) was discovered in 1972 [1]; since TiO2 as a novel photocatalytic material has attracted extensive attention
This paper describes the preparation of a heterojunction catalyst consisting of TiO2 nanorods with CdS nanoparticles
TiO2 (40%)CdS was added to 50 mL of methyl orange (MO) solution (50 mg/L), and the photocatalytic degradation reaction was conducted as the method described above, and the reaction time for each run was set to
Summary
The photocatalytic activity of titanium dioxide (TiO2 ) was discovered in 1972 [1]; since TiO2 as a novel photocatalytic material has attracted extensive attention. Many excellent characteristics have been discovered by researchers, such as its non-toxicity, non-polluting behavior, low cost, and high catalytic efficiency [2] Because of these excellent properties, TiO2 is widely applied in various areas related to environmental protection [3,4,5,6,7]. Fabricated a TiO2–CdS photocatalyst with nano heterostructures via the hydrothermal method and the catalyst TiO2–CdS 10, with 10 wt% CdS content, acquired a higher photocatalytic activity towards the degradation of methyl orange (MO) than that of the bare TiO2 [24]. In the present study we prepared the TiO2 nanorod/CdS nanoparticle heterojunction photocatalyst with excellent photocatalytic performance. It maintained a high recycling performance with the repeated degradation of methyl orange over 10 times, with the degradation rate remaining at 100%
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