Synthesis of Immobilized CdS/TiO2 Nanofiber Heterostructure Photocatalyst for Efficient Degradation of Toluene
2020
Zhang, Mengmeng | Liu, Meng | Jiang, Yan | Li, Jingying | Chen, Qinghua
The immobilized CdS/TiO₂ nanofiber (CdS/TiO₂ NF) heterostructure photocatalyst was fabricated via anodic oxidation and cyclic impregnation method. The microstructure of CdS/TiO₂ NF was characterized by SEM and TEM. The components of CdS/TiO₂ NF were identified by EDX, XPS, and Raman. The optical properties of CdS/TiO₂ NF were characterized by UV-vis DRS and PL. Results showed that CdS was loaded on the surface of TiO₂ NF in the form of particles with a diameter of about 10–80 nm. The Cd and S elements were detected on the surface of catalyst. CdS/TiO₂ NF improved the absorption performance in the ultraviolet and visible light regions and reduced the recombination of photogenerated electron-hole pairs. The performance of CdS/TiO₂ NF on degrading toluene was investigated. Results showed that the deposition of CdS enhanced the photocatalytic activity of TiO₂ NF. The toluene concentration, catalyst dosage, and flow rate had marked impact on the photocatalytic degradation efficiency of toluene. In this reaction system, the degradation ratio was 80.71% when the toluene concentration was 13 mg·L⁻¹, the photocatalyst area was 32 cm², the flow rate was 3 L·min⁻¹, and the illumination time was 100 min. The mineralization ratio after photocatalytic reaction for 100 min was about 45.02%. The immobilized CdS/TiO₂ NF photocatalyst is easy to be recycled, which can reduce the energy and material cost. This work not only highlights the intrinsical role of CdS materials in the enhanced photocatalytic performance of TiO₂ NF but also provides significant guidance on fabricating immobilized CdS/TiO₂ NF photocatalyst applied in environment remediation.
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