Photocatalytic Degradation of Acetone Wastewater by Novel Catalysts

With the acceleration of industrialization, acetone, as an important industrial raw material, is widely used in medicine, cosmetics, electronics and other fields, but the wastewater produced in the production process has caused serious pollution to the environment. As a green, efficient and sustainable pollution control method, photocatalytic technology has been widely concerned in recent years. This paper will deeply discuss the research of new catalysts for photocatalytic degradation of acetone wastewater, and analyze its principle, difficulties and future development direction.

1. PHOTOCATALYTIC DEGRADATION PRINCIPLES

Photocatalysis is a technology that uses semiconductor materials to undergo electronic transitions under light to initiate chemical reactions. The core of the photocatalytic reaction is the semiconductor catalyst, in the light, the electron from the valence band to the conduction band, the formation of electron-hole pair. These electron-hole pairs can undergo redox reactions with pollutants in wastewater, ultimately converting the pollutants into harmless substances (such as CO₂ and H₂ O). Photocatalytic technology is considered to be an ideal method for the treatment of acetone wastewater because of its high efficiency and no secondary pollution.

2. acetone wastewater characteristics and treatment difficulties

Acetone is a flammable and volatile organic compound, which is a refractory organic pollutant. The characteristics of acetone wastewater include high concentration, high toxicity and easy biological inhibition. Traditional treatment methods such as biodegradation and chemical oxidation are often ineffective and have high treatment costs. Photocatalytic technology has become an important means of treating acetone wastewater by virtue of its efficient degradation of organic pollutants.

At present, the commonly used photocatalysts (such as TiO₂) have some limitations: the rapid recombination of electron-hole pairs leads to low photocatalytic efficiency; the limited light absorption range makes it difficult to make full use of sunlight; the stability and reusability of the catalyst also need to be improved. Therefore, the development of efficient and stable new photocatalyst is the key to the application of photocatalytic technology in the treatment of acetone wastewater.

3. New Photocatalyst Design and Research Progress

1. Load metal or non-metal cocatalyst

By loading metal (such as Pt, Ag, Au) or non-metal (such as N, S, P) promoters on the surface of the photocatalyst, the photocatalytic activity can be significantly improved. These promoters can not only reduce the recombination rate of electron-hole pairs, but also increase the light absorption range, thereby improving the photocatalytic efficiency. For example, the efficiency of Pt-loaded TiO₂ catalyst in degrading acetone wastewater is about 40% higher than that of unloaded TiO₂.

2. Heterostructure design

Constructing heterostructures is another effective method to improve the photocatalytic efficiency. By combining two semiconductor materials with different energy band structures, the optical absorption range can be extended and the recombination of electron-hole pairs can be reduced. For example, the efficiency of the heterostructure of Ag₂ CrO₂ and TiO₂ in the photocatalytic degradation of acetone wastewater is significantly improved. This is because the energy band structures of the two materials are complementary, which effectively inhibits the recombination of electron-hole pairs.

3. Co-sensitization strategy

The co-sensitization strategy is to expand the light absorption range of the photocatalyst by introducing a co-sensitizer. The co-sensitizer can capture light of different wavelengths and convert it into visible light range, thereby improving the utilization rate of light energy. For example, by using a dye or an organic molecule as a co-sensitizer, the light absorption range of the photocatalyst can be extended to the visible light region, and the degradation efficiency can be significantly improved.

4. experiment and result analysis

In the experiment, the degradation efficiency of acetone wastewater was significantly improved under the condition of light. Through comparative experiments and spectral analysis, it is found that the new catalyst has a wider light absorption range and a higher utilization efficiency of electron-hole pairs. The new catalyst still maintains high catalytic activity after repeated recycling, showing good stability and reusability. These results show that the new catalyst has broad prospects in acetone wastewater treatment.

5. Future Research Directions

Although the new photocatalyst has made remarkable progress in the treatment of acetone wastewater, there are still some problems that need to be further studied: how to further improve the light absorption efficiency of the catalyst and the utilization efficiency of electron-hole pairs; how to solve the stability and cost of the catalyst The balance between; how to achieve the combination of photocatalytic degradation and resource utilization. Future research can focus on the design of multifunctional photocatalysts, the engineering amplification of catalysts and the resource utilization of photocatalytic reactions.

6. summary

The study of new catalysts for photocatalytic degradation of acetone wastewater is one of the key directions in the field of environmental science. The photocatalytic efficiency and stability of the new catalyst have been significantly improved by loading the catalyst, constructing the heterostructure and co-sensitization strategy. In order to realize its efficient and stable operation in the actual industrial application, further research and exploration are still needed. With the continuous progress of technology, photocatalytic technology will play a greater role in the treatment of acetone wastewater and make important contributions to environmental protection and sustainable development.