CN-122006808-A - Method for preparing dopamine-coated titanium dioxide photocatalyst based on hydrothermal method

Abstract

The application provides a method for preparing a dopamine-coated titanium dioxide photocatalyst based on a hydrothermal method, which comprises the steps of dispersing titanium dioxide powder in deionized water and performing ultrasonic treatment to obtain a uniform titanium dioxide suspension, dissolving a buffer agent in the deionized water to prepare a buffer solution or directly adopting an alkaline solution to adjust the pH value of the titanium dioxide suspension to 7.5-10.0, adding dopamine hydrochloride into the titanium dioxide suspension with the pH value adjusted, stirring until dopamine is fully dispersed to obtain a mixed precursor solution, transferring the mixed precursor solution into a hydrothermal reaction kettle for reaction, naturally cooling to room temperature after the reaction is finished, collecting a reaction product, and performing centrifugation, washing and drying to obtain the polydopamine-coated titanium dioxide photocatalyst, and realizing coupling of adsorption enrichment and photocatalytic degradation by constructing a core-shell structure of polydopamine-titanium dioxide so as to improve the purification efficiency of the catalyst on volatile organic matters in a visible light environment in a seat cabin.

Inventors

• REN XIAONING
• WU HANMING
• LI WEI
• DONG ANQI
• ZHU XIANGLEI
• LV CHENG
• LI ZHENGUO
• SHAO YUANKAI
• LI QINGYANG
• LI JINGYUAN
• LI KAIXIANG
• YAN YAN
• LIU XI
• WANG MAOZHU

Assignees

• 中汽研汽车检验中心（天津）有限公司

Dates

Publication Date

20260512

Application Date

20251204

Claims (10)

1. 1. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method is characterized by comprising the following steps of: dispersing titanium dioxide powder in deionized water and performing ultrasonic treatment to obtain uniform titanium dioxide suspension; dissolving a buffering agent in deionized water to prepare a buffer solution, or directly adopting an alkaline solution to adjust the pH value of the titanium dioxide suspension to 7.5-10.0; adding dopamine hydrochloride into the titanium dioxide suspension after the pH value is regulated, and stirring until the dopamine is fully dispersed to obtain a mixed precursor solution; Transferring the mixed precursor liquid into a hydrothermal reaction kettle for reaction; And naturally cooling to room temperature after the reaction is finished, collecting a reaction product, and centrifuging, washing and drying to obtain the polydopamine coated titanium dioxide photocatalyst.
2. 2. The method for preparing the dopamine coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 1, wherein the titanium dioxide powder is nano anatase titanium dioxide.
3. 3. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 2, wherein the specific surface area of the nano anatase titanium dioxide is 50-300 m2/g.
4. 4. The method for preparing the dopamine coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 1, wherein the buffer is one of tris hydrochloride, phosphate or borate.
5. 5. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 1, wherein the molar ratio of the dopamine hydrochloride to the titanium dioxide powder is 1:20-3:1.
6. 6. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 1, wherein the temperature range of the hydrothermal reaction kettle is 120-180 ℃.
7. 7. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 6, wherein the temperature of the hydrothermal reaction kettle is 140-160 ℃.
8. 8. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 1, wherein the reaction time of the mixed precursor solution in the hydrothermal reaction kettle is 4-48 hours.
9. 9. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 8, wherein the reaction time of the mixed precursor solution in the hydrothermal reaction kettle is 6-10 hours.
10. 10. The method for preparing the dopamine-coated titanium dioxide photocatalyst based on the hydrothermal method according to claim 1, wherein the drying is vacuum drying or freeze drying.

Description

Method for preparing dopamine-coated titanium dioxide photocatalyst based on hydrothermal method Technical Field The application relates to the technical field of catalyst preparation, in particular to a method for preparing a dopamine-coated titanium dioxide photocatalyst based on a hydrothermal method. Background With the development of the automobile industry and the improvement of the driving experience requirements of consumers, the air quality in the automobile cabin has become a key index for measuring the quality and the safety of the automobile. New vehicle interior materials, such as instrument panels, seats, ceilings, carpets, and other plastics, leather, adhesives, continue to release a variety of volatile organic compounds (Volatile Organic Compounds, VOCs for short), most typically formaldehyde, acetaldehyde, benzene, toluene, xylene, and the like. These VOCs accumulate very easily in a confined and narrow cabin environment, and their release rates are significantly faster, especially in high temperature environments. Prolonged exposure to such mixed VOCs can pose a potential threat to the health of the occupants. Therefore, the efficient removal of various VOCs in the automobile cabin, especially formaldehyde which is difficult to degrade naturally, is a core problem to be solved in the field of automobile air purification. At present, the purification technology for the VOCs in the automobile cabin mainly comprises activated carbon adsorption, ozone oxidation, photocatalytic oxidation and the like. The activated carbon adsorption technology is most widely applied, but only adsorbs and enriches pollutants instead of thoroughly eliminates the pollutants, and has the inherent defects of easy saturation, frequent replacement, possible desorption when the temperature is increased, secondary pollution and the like. Ozone oxidation can decompose organic matters, but excessive ozone is a harmful pollutant and can stimulate the respiratory tract of a human body. In contrast, photocatalytic oxidation technology is capable of thoroughly mineralizing various VOCs into harmless CO 2 and H 2 O using ultraviolet light or visible light driven reactions at room temperature, and is the most potential radical solution to develop. Among the numerous photocatalysts, titanium dioxide (TiO 2) has been widely studied for its advantages of high activity, non-toxicity, stability, and low cost. However, the wide forbidden band characteristic of TiO 2 cannot effectively utilize the visible light band, and has poor adsorption capability to low-concentration, neutral VOCs molecules, and high photon-generated carrier recombination rate, so that it is difficult to meet the actual application requirements of the automobile cabin. Therefore, a catalyst that can effectively improve the purification efficiency is desired. Disclosure of Invention The present application has been made to solve the above-mentioned technical problems. The embodiment of the application provides a method for preparing a dopamine-coated titanium dioxide photocatalyst based on a hydrothermal method. The application provides a method for preparing a dopamine-coated titanium dioxide photocatalyst based on a hydrothermal method, which comprises the steps of dispersing titanium dioxide powder in deionized water and performing ultrasonic treatment to obtain uniform titanium dioxide suspension, dissolving a buffering agent in the deionized water to prepare a buffer solution or directly adopting an alkaline solution to adjust the pH value of the titanium dioxide suspension to 7.5-10.0, adding dopamine hydrochloride into the titanium dioxide suspension with the pH value adjusted, stirring until dopamine is fully dispersed to obtain a mixed precursor solution, transferring the mixed precursor solution into a hydrothermal reaction kettle for reaction, naturally cooling to room temperature after the reaction is finished, collecting a reaction product, and centrifuging, washing and drying to obtain the polydopamine-coated titanium dioxide photocatalyst. In one embodiment, the titanium dioxide powder is nano anatase titanium dioxide. In one embodiment, the specific surface area of the nano anatase titanium dioxide is 50-300 m2/g. In one embodiment, the buffer is one of tris hydrochloride, phosphate or borate. In one embodiment, the molar ratio of the dopamine hydrochloride to the titanium dioxide powder is 1:20-3:1. In one embodiment, the temperature range of the hydrothermal reaction kettle is 120-180 ℃. In one embodiment, the temperature range of the hydrothermal reaction kettle is 140-160 ℃. In one embodiment, the reaction time of the mixed precursor solution in the hydrothermal reaction kettle is 4-48 hours. In one embodiment, the reaction time of the mixed precursor solution in the hydrothermal reaction kettle is 6-10 hours. In one embodiment, the drying is vacuum drying or freeze drying. The application provides a method for preparing a dopamine-coated titan