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Mesoporous silica gel loading titanium pillared clay photocatalyst, preparation method and application thereof

A technology of mesoporous silica gel and photocatalyst, applied in chemical instruments and methods, physical/chemical process catalysts, silicon compounds, etc., can solve the collapse of clay layers, weaken the removal efficiency of titanium pillared clay for organic pollutants, reduce titanium The specific surface area and adsorption capacity of pillared clay can be improved to enhance the reaction rate and efficiency, have a broad potential for environmental protection applications, and avoid the problems of post-processing and secondary pollution.

Inactive Publication Date: 2010-06-02
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation process of titanium pillared clay, due to high temperature calcination, the clay will undergo a considerable degree of interlayer collapse, which greatly reduces the specific surface area and adsorption capacity of titanium pillared clay, thereby weakening the effect of titanium pillared clay on organic pollution. removal efficiency

Method used

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  • Mesoporous silica gel loading titanium pillared clay photocatalyst, preparation method and application thereof
  • Mesoporous silica gel loading titanium pillared clay photocatalyst, preparation method and application thereof
  • Mesoporous silica gel loading titanium pillared clay photocatalyst, preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Soak 100-mesh silica gel with 0.3mol / L nitric acid for 1 hour, then filter and wash with water until the pH of the washing solution is 7, and dry the washed precipitate at 100°C to obtain activated silica gel.

[0028] (2) The clay and deionized water are prepared into a suspension mixing system with a mass fraction of 1%, and fully swelled for 24 hours to obtain a swollen suspension mixing system.

[0029] (3) Dilute titanium sol by molar ratio of titanium ions (Ti 4+ ): cation exchange capacity (CEC) = 80: 1 was slowly added to the swollen suspension mixing system obtained in step (2), and a mixed solution was obtained after stirring for 8 hours.

[0030] Among them, the titanium sol is TiO 2 Sol, using the sol-gel method, using acetic acid as the catalyst to inhibit the hydrolysis, butyl titanate as the precursor, Ti in molar ratio 4+ :H + =1:3 ratio was stirred for 8 hours to prepare;

[0031] (4) Add 80 g of the activated silica gel obtained in step (1) to ...

Embodiment 2

[0041] (1) Soak 50-mesh silica gel with 0.04mol / L hydrochloric acid for 3 hours, then filter and wash with water until the pH of the washing solution is 3, and dry the washed precipitate at 50°C to obtain activated silica gel.

[0042] (2) The clay and water are prepared into a suspension mixing system with a mass fraction of 2%, and the swelling is fully swollen for 12 hours to obtain the swollen suspension mixing system.

[0043] (3) Dilute titanium sol by molar ratio of titanium ions (Ti 4+ ): cation exchange capacity (CEC) = 10: 1 was slowly added to the swollen suspension mixing system obtained in step (2), and a mixed solution was obtained after stirring for 20 hours.

[0044] Among them, the titanium sol is TiO 2 Sol, using the sol-gel method, using acetic acid as the catalyst to inhibit the hydrolysis, butyl titanate as the precursor, Ti in molar ratio 4+ :H + =1:2 ratio and stirred for 1 hour to prepare;

[0045] (4) Add 100g of activated silica gel obtained in st...

Embodiment 3

[0047] (1) Soak 100-mesh silica gel with 0.01mol / L nitric acid for 12 hours, then filter and wash with water until the pH of the washing solution is 10, and dry the washed precipitate at 150°C to obtain activated silica gel.

[0048] (2) The clay and deionized water are prepared into a suspension mixing system with a mass fraction of 10%, and fully swelled for 18 hours to obtain a swollen suspension mixing system.

[0049] (3) Dilute titanium sol by molar ratio of titanium ions (Ti 4+ ): cation exchange capacity (CEC) = 50: 1 was slowly added to the swollen suspension mixing system obtained in step (2), and stirred for 2 hours to obtain a mixed solution.

[0050] Among them, the titanium sol is TiO 2 Sol, using the sol-gel method, using acetic acid as the catalyst to inhibit the hydrolysis, butyl titanate as the precursor, Ti in molar ratio 4+ :H + = 1:10 ratio was stirred for 8 hours to prepare;

[0051] (4) Add 40 g of activated silica gel obtained in step (1) to 300 mL ...

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Abstract

The invention discloses a mesoporous silica gel loading titanium pillared clay photocatalyst, a preparation method and application thereof, belonging to the technical field of adsorptive and catalytic material. In the invention, titanium sol is dripped into sodium-based clay to be stirred, after adequate pillaring reaction, activated silica gel processed by acid is added for continuous stirring, after the silica gel is the mixture system is fully deposited, the supernate is filtered out, the deposit is dried and roasted to obtain the mesoporous silica gel loading titanium pillared clay photocatalyst. The inventive mesoporous silica gel loading titanium pillared clay photocatalyst has stronger adsorptivity to organic pollutants and stronger photocatalytic activity, thus realizing integration of absorption to organic pollutants and photocatalytic oxidation, causing the hydroxyl radical generated on the surface of catalyst to efficiently mineralize and degrade the enriched organic pollutants absorbed by adsorptive material in situ, and greatly enhancing reaction rate and efficiency of photocatalytic degradation of organic pollutants. The invention can be applied as adsorbent or photocatalyst in environment protection field.

Description

technical field [0001] The invention relates to the technical field of adsorption-type catalytic materials, in particular to a mesoporous silica-supported titanium pillared clay photocatalyst, a preparation method thereof, and an application in the fields of water body and atmospheric environment protection. Background technique [0002] Semiconductor photocatalysis technology has shown good application prospects in the treatment of toxic organic pollutants. Under suitable conditions, semiconductor photocatalytic technology can non-selectively and completely mineralize organic pollutants in water and gas phases into CO 2 , water and inorganic salts, thereby eliminating or reducing the impact of organic pollutants on the environment without causing secondary pollution. Due to the advantages of low cost, non-toxicity and high catalytic activity, semiconductor TiO 2 Photocatalysts have great application potential in the environmental field, so they have been extensively studi...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J21/06B01J20/10
Inventor 安太成陈江耀李桂英
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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