Nano titanium dioxide photocatalyst capable of degrading phenolic pollutants in wastewater

Abstract

The invention belongs to the technical field of degrading organic pollutants in wastewater by multiphase photocatalytic oxidation technology, and particularly relates to a nano titanium dioxide photocatalyst capable of degrading phenolic pollutants in the wastewater, and a preparation method of the nano titanium dioxide photocatalyst comprises preparation of a composite material containing graphite oxide powder, processing of nano titanium dioxide particles and synthesis of the nano titanium dioxide photocatalyst. Compared with the prior art, the nano titanium dioxide photocatalyst has the following advantages: doping levels can be formed by effective compounding, effective charge separation is increased, the energy band width of the titanium dioxide is reduced, light transmittance is increased, light utilization rate of the catalyst is increased, photo-corrosion phenomenons can be avoided, the pollutants can be quickly adsorbed, due to a larger specific surface area and a high-void structure of the nano titanium dioxide photocatalyst, more pollutant molecules can be adsorbed, and degradation effect of the phenolic pollutants in the wastewater can be improved.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous photocatalytic oxidation technology for degrading organic pollutants in wastewater, in particular to a nano-titanium dioxide photocatalyst capable of degrading phenolic pollutants in wastewater. Background technique [0002] Industrial wastewater and urban residents' domestic water are the main sources of water pollution in China. With the rapid development of industry and economic growth in recent years, the pollution of high-concentration organic wastewater has become increasingly serious. Organic wastewater mainly comes from industrially produced textile dyes, surface Active agents, antifouling compounds, etc., antibiotics, steroids and other drugs produced in hospitals, and pesticides and herbicides in agricultural production, etc. However, the traditional natural adsorption, reverse osmosis, coagulation and biodegradation capabilities are far from enough, and only transfer pollutants Go...

AI Technical Summary

Problems solved by technology

[0002] Industrial wastewater and urban residents' domestic water are the main sources of water pollution in China. With the rapid development of industry and economic growth in recent years, the pollution of high-concentration organic wastewater has become increasingly serious. Organic wastewater mainly comes from industrially produced textile dyes, surface Active agents, antifouling compounds, etc., antibiotics, steroids and other drugs produced in hospitals, and pesticides and herbicides in agricultural production, etc. However, the traditional natural adsorption, reverse osmosis, coagulation and biodegradation capabilities are far from enough, and only transfer pollutants Going to another place or another stage will easily cause secondary pollution and pose a serious threat to human health. Phenol pollutants are a typical representative. If you drink water contaminated by phenol for a long time, chronic poisoning will occur, causing headaches and dizziness. , fatigue, insomnia, tinnitus, anemia, and nervous system disorders, and even cause cancer, so the treatment of phenolic wastewater is becoming increasingly important; at present, the treatment methods for phenolic wastewater mainly include physical, chemical, biochemical and combined technologies, but none There are some defects; heterogeneous photocatalytic oxidation technology has been proven to properly handle different persistent organic pollutants in wastewater, remove or mineralize into CO2 and H2O, TiO2, as a typical oxide semiconductor material, has high activity and photostable Good performance, non-toxic to the human body, low cost, simple application process, easy control of operating conditions, no secondary pollution and other superior properties, it has become the most potential green catalyst, but because of its wide energy band width, the light energy The utilization rate is low. On the other hand, the high recombination rate of photo-generated electrons on the conduction band and photo-generated holes on the valence band of TiO2 leads to low photoelectron efficiency; for the defects of TiO2, the existing technology usually uses noble metals, transition metals and transition metal oxides. Doping is improved, but the scarcity and high price of precious metal resources limit its application range