Preparation Process of Fluorine-Tungsten Co-Doped Photocatalyst

As a new type of wastewater treatment technology, photocatalysis can be widely used in the building decoration market and indoor vehicles. The photocatalytic process has almost no selectivity for the degradation of organic matter, and can completely mineralize organic pollutants without secondary pollution.  The unique advantages of simple equipment, low investment and good effect.

 The traditional photocatalytic oxidation technology uses TiO2 as a catalyst, but due to the wide band gap of the TiO2 (about 3.2 ev), the utilization of sunlight is low.  Therefore, people have further studied composite catalysts with better performance.

 It has been found that tungsten catalysts have good catalytic properties, among which WO3 is favored for its low cost and easy availability. WO3 has a narrow band gap (2.4eV-2.8eV), which can fully utilize visible light, but its redox  The ability is weak, and the light response range and photocatalytic performance can be further improved by changing the structure of WO3 and supporting other metals.  Recently, researchers are paying attention to a new type of fluorine-tungsten co-doped photocatalyst, in order to solve the problems of unstable photocatalytic materials and limited photocatalytic effects.

 A method for preparing a fluorine-tungsten co-doped photocatalyst, the steps of which include:

 Step 1: Select 50 g of titanium source hexafluorotitanate to be dissolved in a 500 ml beaker, add 10 ml of HBO3 scavenger to the beaker, then transfer to a muffle furnace, warm and preheat, and preheat the temperature at 90 °C.

 Step 2: Take out the beaker and heat it in a microwave oven, then transfer it to a reflux device for reflux, and return it once and return it twice.  The preheating temperature was controlled at 80 ° C and then refluxed.  For example, two refluxes are used, wherein the first reflux time is 25 min, the temperature is 45 ° C, the second reflux time is 1.5 h, and the temperature is 80 °C.

 Step 3: Transfer the refluxed solution to a three-necked flask, and add 10 ml of ammonium dihydrogen phosphate, 10 ml of phosphotungstic acid, and 10 ml of nitric acid (all analytically pure) to form a uniform stable tungsten-titanium solution, and then heat-collecting at a constant temperature.  The stirrer was stirred slowly for 1 h.

 Step 4: Weigh 10 ml of ammonia water and CO (NH 2 ) 2 mixture into the above agitator, and uniformly precipitate, and the solution will slowly form a stable colloidal solution.

 Step 5: Polyacrylic acid was dispersed with 10 ml of an aqueous phase dispersing agent and slowly dropped into the colloidal solution at a dropping rate of 1 ml/s.

 Step 6: Solution Transfer: The mixed liquid obtained in the step 5 was transferred to a tetrafluoroethylene reactor.

 Step 7: Photoelectrocatalytic treatment: The solution in the tetrafluoroethylene reactor was transferred to the prepared electrochemical reaction electromagnetic, the catalytic time was 35 min, and the light intensity was 50 w ultraviolet lamp.

 Step 8: The photocatalytic reaction solution is transferred to a muffle furnace for drying, preheated at 90 ° C, preheating time is 20 min, and then transferred to a high temperature calcining furnace for calcination, the calcination temperature is 500 ° C, and the calcination time is 2 h.  .

 Step 9: After the completion of the calcination, the temperature is lowered, washed, and water (attached water) and crystal water are removed to increase the crystallinity.

 Step 10: Add 500 ml of deionized water to dissolve, then acidify

 Step 11: Finally form a fluorine-tungsten co-doped quantum-scale photocatalyst F-WO3-TiO2 high-fine grain powder

 By adding a tungsten source to form a binary composite photocatalyst, the particle structure is improved by means of photosensitization, photoelectrocatalysis or chemical modification, micro-mesoporous particles are formed, the surface state of the particles is improved, and the surface-capture efficiency of photons is enhanced.  The photocatalytic performance of the final product is greatly improved.

• < Prev
• Next >