Study Of The Absorption And Advanced Oxidation Processes(AOPs) Treatment Of Organic Dye Pollution On Activated Carbon Fiber (ACF) Electrode

The absorption and advanced oxidation processes (AOPs) treatment of dye, one of the organic pollutants, using activated carbon fiber (ACF) electrode were reported in this thesis. Firstly, the absorption and desorption behavior of Direct deep blue L-3RB (DDBL-3RB) on ACF were studied. Secondly, the mineralization of DDBL-3RB was studied by advanced electrochemical oxidation processes (AEOPs) using ACF electrodes. Finally, TiO₂ was anchored on the ACF surface and the photocatalytic reactivity of the photocatalyst was tested by the degradation experiments of methylene blue (MB), XPS (X-ray photoelectron spectroscopy), XRD (X-ray diffraction), SEM (Scanning electron microscopy) and UV-vis diffuse reflectance spectrosopy were used to characterize the TiO₂ film and detect the morphologies of the photocatalyst. The results indicate that the photocatalyst combined the ability of ACF absorption and TiO₂ photocatalysis and show a high photocatalytic reactivity to degrade MB. The main contents are shown as follows:1. The absorption behaviors of direct deep blue (DDBL-3RB) on active carbon fiber (ACF) were studied using infrared and visible spectroscopy. The electrochemical regeneration possibility of ACF saturated with DDBL-3RB was certified in this work. The result shows that the optimal acidity is pH=5. Meanwhile, Cu and graphite stick served as cathode and anode to desorb ACF, using 2% NaCl as the electrolyte. We found the regeneration efficiency of ACF in cathode area can reach up to 95%. The absorption and desorption mechanism of DDBL-3RB on ACF were also discussed during the experiment.2. The mineralization of direct deep blue L-3RB (DDBL-3RB) was studied by advanced electrochemical oxidation processes (AEOPs) using active carbon fiber (ACF) electrodes. Two different processes— electro-Fenton and photoelectro-Fenton were involved. A solution of 60ppm DDBL-3RB containing 0.05mol/L Na₂SO₄ was used for the mineralization. It was found that the photoelectro-Fenton process showed higher total organic carbon (TOC) and color removal ratio. It is concluded that the degradation mechanism of these AEOPs is due to the hydroxyl radicals produced by the reaction between Fe²⁺ and electrogenerated H₂O₂.3. TiO₂ film loaded on activated carbon fibers (ACF) was prepared by a pasting treatment. The properties of resulting materials were characterized by XRD, XPS, SEM and UV-visdiffuse reflectance spectra. Its photocatalytic degradation ability was studied using methylene blue (MB) as the target pollution. It was found that the crystalline pattern of immobilized UO2 was still anatase-form after calcinations. The degradation experiments of MB and cycling usage of photocatalyst indicate that the conbined photocatalyst has better photocatalytic reactivity.