Integrated catalysis system based on TiO2 nanotube photocatalyst and degrading treatment method of integrated catalysis system

Abstract

The invention discloses an integrated catalysis system based on a TiO2 nanotube photocatalyst. The TiO2 nanotube photocatalyst-based integrated catalysis system comprises TiO2 nanotubes, a visible light source or sunlight, an electrocatalysis device and an oxygenating pump, wherein the electrocatalysis device uses the TiO2 nanotubes as an anode and fibrous graphite felt as a cathode, and the anodeand the cathode are inserted into organic wastewater and are respectively connected to positive and negative electrodes of a voltage-stabilized power supply; the visible light source or sunlight correspondingly irradiates the anode; Fe<2+> is added into the organic wastewater; the oxygenating pump is positioned at the cathode. The invention further discloses a degrading treatment method of the integrated catalysis system based on the TiO2 nanotube photocatalyst. An external electric field environment is formed through application of external bias voltage to the TiO2 nanotubes so as to form acombination of TiO2 photocatalysis and electrocatalysis, and a Fenton reaction is further introduced to form the integrated catalysis system having a coupled and synergistic effect of a TiO2 nanotubevisible light catalysis reaction, an electrocatalytic reaction and the Fenton reaction, so that the degradation efficiency of toxic and refractory organic pollutants is greatly improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a TiO-based 2 Integrated catalytic system of nanotube photocatalyst and its degradation treatment method. Background technique [0002] Advanced Oxidation Technology is an effective method to treat dye wastewater. The mechanism of this technology is the process of generating hydroxyl radicals (HO·) through different channels. Once HO· is formed, it will induce a series of free radical chain reactions and attack each pollutants until degraded into carbon dioxide, water and other small molecule inorganic substances. Fenton as the founder of Advanced Oxidation Technology invented Fe 2+ / H 2 o 2 system, which can completely mineralize and degrade almost all organic matter into small inorganic molecules such as carbon dioxide and water. The reaction mechanism is as follows: [0003] h + +Fe 2+ +H 2 o 2 → Fe 3+ +HO· [0004] TiO 2 The photocatalytic reaction al...

AI Technical Summary

Problems solved by technology

However, due to the serious loss of intensity after the light enters the nanotube, the utilization rate of the inner surface of the tube in the catalysis is greatly reduced, and the TiO 2 Nanotube arrays grown on conductive metallic titanium substrates, TiO 2 The photogenerated electrons and holes generated under light excitation are also easier to recombine, so the quantum efficiency is low, and its photocatalytic efficiency is far from meeting the requirements of practical applications; and, due to the narrow spectral response range, TiO 2 The semiconductor has a forbidden band width of 3.2eV and can only respond to ultraviolet light with a wavelength below 390nm, so the utilization rate of sunlight is extremely low

[0006] Therefore, the current existing technologies have poor treatment effects on organic pollutants, especially those that are highly toxic and difficult to degrade, and it is difficult to achieve high-efficiency degradation. It is still necessary to develop new treatment systems and catalytic materials to effectively improve the performance of toxic and difficult to degrade organic pollutants. Degrade the degradation efficiency of organic pollutants, promote the progress and development of wastewater treatment technology

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