Investigation of Enhancement of Spinning Disk Reactor on the Degradation of Phenol Wastewater by Photocatalytic System

Abstract

In this paper, TiO₂ and Fe doped TiO₂ (Fe–TiO₂) photocatalysts were prepared by a sol–gel method, and the catalyst was immobilized on the surface of a spinning disk reactor (SDR) turntable by a dip-immobilizing method. The synthesized TiO₂ film and Fe–TiO₂ film were characterized using X-ray diffraction, Raman spectra, ultraviolet and visible spectra and scanning electron microscopy. The results proved that the prepared TiO₂ and Fe–TiO₂ nanoparticles were anatase phase and the average crystallite sizes were 20 nm and 10 nm, respectively. The effect of rotational speed and flow rate on the photocatalytic efficiency of TiO₂ and the degradation performance of phenol wastewater by three systems of TiO₂, Fe–TiO₂ and TiO₂/H₂O₂ were investigated. The results showed that the rotational speed and flow rate are the main factors affecting the thickness and residence time of the surface of the turntable, and then the degradation efficiency of phenol wastewater was affected; in the three catalytic systems, the degradation rate of TiO₂ was 41%, Fe–TiO₂ increased to 70%, and TiO₂/H₂O₂ reached 99%.