Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7834793 | Applied Surface Science | 2018 | 36 Pages |
Abstract
We report herein a means of transforming TiO2 nanotube arrays (TNAs) from an amorphous state to an anatase crystal state (denoted as âTNAs), and present a single-step synthetic route for preparing CdS quantum dots (CdS QDs) as well as reduced graphene oxide (rGO) through gamma-ray irradiation. The as-prepared âTNAs, CdS QDs, and rGO, which had all been subjected to gamma-ray irradiation, were then assembled together to produce the desired heterojunction (denoted as CdS QDs/rGO-âTNAs). X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), ultraviolet/visible diffuse-reflectance spectroscopy (UV/Vis DRS), Fourier-transform infrared spectroscopy (FTIR), micro-Raman spectrometry (RS), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) have been applied to characterize the appearance and performance of this photocatalyst. The photocatalytic activity of CdS QDs/rGO-âTNAs towards ethylene degradation has been measured by placing it in a simulated cold-storage environment, the temperature and humidity of which were set at about 3â¯Â±â¯1â¯Â°C and 75-90%, respectively. The results showed that the rate constant (K) of ethylene degradation could reach up to 1.07â¯Ãâ¯10â3â¯minâ1 with CdS QDs/rGO-âTNAs, as compared to 2.30â¯Ãâ¯10â4â¯minâ1 with âTNAs and 6.25â¯Ãâ¯10â4â¯minâ1 with CdS QDs-âTNAs, indicating that the constructed CdS QDs/rGO-âTNAs constitutes a promising photocatalyst for ethylene removal in a cold storage environment.
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Authors
Quan Zhang, Shengying Ye, Xianliang Song, Shucan Luo,