Dye-sensitized photoelectrocatalytic degradation device and application thereof

Abstract

The invention provides a dye-sensitized photoelectrocatalytic degradation device which comprises a titanium dioxide film electrode component and an anode, wherein the titanium dioxide film electrode component comprises a glass substrate, a nano-sized titanium dioxide film, a dye-sensitized film, an electrolyte and a counter electrode; the nano-sized titanium dioxide film has two functional regions, namely the dye-sensitized film positioned in upper dye-sensitizing region and a degradation electrode positioned in a lower degradation region; the two ends of the dye-sensitized film and the two ends of the counter electrode are bonded and sealed with a sealing compound to form a sandwich structure which is full of the electrolyte in the middle; and the counter electrode and the anode are connected through a lead. The degradation device is used for degrading organic pollutants. The invention has the advantages that the degradation device has a novel structure and is easy to implement; the photocatalytic response range of titanium dioxide is widened to the visible light region, thereby increasing the utilization efficiency of solar energy; the sandwich structure prevents dye from being degraded to increase the service life of the dye; a constant-voltage DC power supply increases the efficiency of reducing and regenerating the oxidized dye through gaining electrons, thereby improving the degradation efficiency.

Description

technical field [0001] The invention belongs to industrial sewage treatment technology, in particular to a dye-sensitized photoelectric catalytic degradation device and its application. Background technique [0002] Many persistent organic pollutants are carcinogenic, teratogenic, and mutagenic, posing a serious threat to human survival, reproduction, and sustainable development. In recent years, the degradation of organic pollutants has attracted great attention, and how to improve the degradation of such substances has become one of the most active research fields in the world. Solar energy is a clean and renewable energy source, and the development of solar energy to degrade organic pollutants is an important issue in protecting the ecological environment on which human beings depend. [0003] Titanium dioxide (TiO 2 ) nanocrystal photolysis of organic pollutants has been favored by researchers. The main reason is that this nanomaterial has high photocatalytic reactivi...

AI Technical Summary

Problems solved by technology

One is that titanium dioxide has low efficiency in solar energy utilization, which is due to the fact that TiO 2 The gap between the conduction band and the valence band of a semiconductor is wide (E g =3.2eV), which determines that it can only absorb ultraviolet light with a wavelength below 385nm, while only 5% of the solar spectrum is ultraviolet light, so the utilization rate of solar energy is very low, which limits its use in photocatalytic degradation of organic pollutants use in

Second, the separation of titanium dioxide nanoparticles is difficult, which also limits the practical application.

Making titanium dioxide into a thin film is one of the effective methods to solve the separation of catalysts. In addition, the photocatalytic response range of titanium dioxide is extended to the visible light region by dye sensitization, but electrons are generated when the dye absorbs photons, and highly active hydroxyl radicals are generated. In the process of decomposing pollutants, the dye itself will also be degraded, eventually leading to sensitized TiO 2 Visible light catalytic system deactivation

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