A visible light catalyst for efficiently degrading organic dye wastewater and its preparation method

Abstract

The invention relates to a visible light catalyst for high-efficiently degrading organic dye waste water and a preparation method thereof, which belong to the technical field of environment and energy source. The preparation method is characterized by comprising the steps of mixing zinc ferrite and chitosan, cross-linking the mixture through glutaraldehyde so as to obtain a cross-linked chitosan / zinc ferrite compound, growing cuprous oxide on the surface of the cross-linked chitosan / zinc ferrite compound under the low-temperature hydrothermal condition so as to obtain the cuprous oxide / cross-linked chitosan / zinc ferrite triplet composite visible light catalyst. By adopting the novel triplet composite visible light catalyst, multiple coordination functionality of the chitosan, the zinc ferrite and the cuprous oxide can be played, the composite possibility of an electron and an electron hole can be effectively reduced, the apparent band-gap energy of the composite catalyst can be reduced, the spectrum range can be enlarged, the utilization rate of the visible light can be greatly improved, and the treatment effect of the waste water can be enhanced; the visible light catalyst is stable in performance, has no residue, has magnetism and is easily recycled; the waste water treatment process is simple, the cost can be greatly reduced, and the visible light catalyst and the preparation method thereof are an environment-friendly and high-efficient novel material and a novel method respectively.

Description

technical field [0001] A visible light catalyst for efficiently degrading organic dye wastewater and a preparation method thereof, the invention belongs to the technical field of environment and energy, and specifically relates to the preparation of a three-way composite visible light catalyst of cuprous oxide / cross-linked chitosan / zinc ferrite and its use in treatment organic dye wastewater. Background technique [0002] With the rapid development of modern industry, the discharge of industrial wastewater is increasing. Among all kinds of industrial wastewater, dye wastewater is a kind of difficult-to-use wastewater due to its deep color, high COD, and a large amount of teratogenic and carcinogenic azo compounds, which seriously endanger the ecological environment and pose a threat to people's life and health. The treated wastewater urgently needs new green and efficient treatment technologies. [0003] As a green energy technology, photocatalysis has attracted widespread...

AI Technical Summary

Problems solved by technology

However, the band gap energy (3.2eV) of titanium dioxide is too wide, and its excitation wavelength is 387.5nm, which belongs to the ultraviolet region

For the solar spectrum, the main energy is concentrated in the wavelength range of 460nm to 600nm, and the proportion of ultraviolet light is less than 4%, so the utilization efficiency of titanium dioxide to sunlight is extremely low; the recombination probability of photogenerated carriers (electrons and holes) in titanium dioxide High, resulting in a decrease in quantum efficiency and affecting photocatalytic efficiency; in addition, when treating wastewater, titanium dioxide nanoparticles suspended in the system are prone to agglomeration and inactivation, and it is difficult to recover after the reaction and difficult to recycle

However, cuprous oxide is easy to agglomerate, which greatly reduces the catalytic specific surface area and affects the photocatalytic efficiency; it is difficult to recycle and easy to remain; the recombination probability of electron and hole pairs is high, etc.

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