Method for preparing SO42-/TiO2 through supercriticalo exsiccation

A supercritical drying, sulfuric acid technology, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve the problems of decreased catalytic activity, shedding of catalyst surface, unusable catalyst, etc., and achieves long service life, The effect of high photocatalytic activity

Inactive Publication Date: 2005-01-12
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, catalysts such as solid acids are prepared by impregnating titanium oxide into acid, but this type of catalyst cannot be used under liquid phase conditions. The reason is that the interaction between the acid radical and the surface of the catalyst is not strong. will fall off the surface of the catalyst
leading to a decrease in catalytic activity
And about the preparation of doped SO by supercritical drying method 4 2- new SO 4 2- / TiO 2 Photocatalysts have not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0020] Slowly drop 10 mL of butyl titanate into 40 mL of absolute ethanol to obtain solution A. Prepare a 1:5 (V / V) sulfuric acid solution with double distilled water to obtain solution B.

[0021] Take 1.0mL, 1.5mL, 2.0mL, 2.5mL of B solution and mix it with 10mL of absolute ethanol, then slowly drop it into A solution and stir vigorously, and continue stirring for 40min after the drop is completed to obtain a uniform and transparent TiO 2 sol.

[0022] The obtained sol was aged at 318±1K for 72 hours to obtain a wet gel.

[0023] Transfer the wet gel to a 500mL autoclave, add 250mL absolute ethanol, and then pass N into the autoclave 2 Gas in the kettle for 20 minutes to exchange the air in the kettle, then gradually increase the temperature to 333K, keep the pressure at 110MPa, let it stand for 2 hours, then slowly release the gas in the kettle to normal pressure at the original temperature, and finally inject N 2 and naturally cooled to room temperature. TiO will be ob...

Embodiment

[0029] Molar ratio (m 2 / g) (cm 3 / g) (nm) (nm)

[0030] 1 0.020 93.254 0.472 1.5-170.6 16.283

[0031] 2 0.025 105.445 0.518 1.8-173.8 19.670

[0032] 3 0.028 103.261 0.640 2.1-185.4 25.526

[0033] 4 0.032 100.138 0.764 2.3-191.9 30.520

Embodiment 5～8

[0038] The catalysts of Examples 1 to 4 and Comparative Example 1 were applied to the photocatalytic degradation reaction of phenol in liquid phase, the temperature was 305.0K and the time was 3h or 4h; the initial concentration of phenol was 0.1 g / L, and the volume was 30 mL; the amount of catalyst was 0.05 g; the light source was Mixed light (254, 310, 365nm each, power average 8W). The results are shown in Table 2.

[0039] Table 2

[0040] Degradation of Phenol by Catalysts with Different Sulfur Content

[0041] Example S / Ti measured ratio Degradation rate (3h) Degradation rate (4h)

[0042] Comparative Example 1 0.15 61.7% 76%

[0043] 1 0.020 81% 96%

[0044] 2 0.025 85% 100%

[0045] 3 0.028 74% 97%

[0046] 4 0.032 68% 94%

[0047] The relationship between the number of reused catalysts and the degradation rate is shown in Table 3.

[0048] table 3

[0049] The relationship between the n...

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Abstract

A process for preparing the catalyst SO4/TiO2 by supercritical drying method includes slowly dropping the sulfuric acid-alcohol-water solution in butyl titanate-alcohol solution to obtain TiO2 sol, ageing to obtain wet gel, mixing it with alcohol, staying in inertial atmosphere and supercritical condition for 0.5-8 hr, cooling and calcining. Its adantages are high specific surface area and photocatalytic activity, and long service life.

Description

technical field [0001] The present invention relates to a kind of SO 4 2- / TiO 2 A method for preparing a photocatalyst, in particular a method for preparing the photocatalyst under supercritical conditions. Background technique [0002] In recent years, the use of semiconductor photocatalysts to treat various pollutants in the environment has attracted worldwide attention, and photocatalytic degradation of organic matter is of great significance in environmental governance. TiO 2 With its advantages of non-toxicity, high catalytic activity, good chemical stability, cheap and easy to obtain, and direct use of sunlight, it has attracted people's attention, and has become a typical photocatalyst. 2 The general method of photocatalyst is to use Sol-gel method to prepare the catalyst precursor state, then heat treatment, then direct drying and high temperature calcination to obtain ultrafine TiO 2 particles. The disadvantage of the direct heating method is that the sample ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/053B01J37/03
Inventor 李和兴李贵生王明辉
Owner SHANGHAI NORMAL UNIVERSITY
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