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Mesoporous silica-supported titanium pillared clay photocatalyst and its preparation method and application

A technology of mesoporous silica gel and photocatalyst, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, silicon compounds, etc., can solve the collapse between clay layers, reduce the specific surface area and adsorption capacity of titanium pillared clay, and weaken titanium pillars Supporting clay to remove organic pollutants and other issues, to achieve the effect of enhancing reaction rate and efficiency, broad environmental protection application potential, and avoiding post-disposal and secondary pollution problems

Inactive Publication Date: 2011-12-14
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-supported titanium pillared clay photocatalyst and its preparation method and application
  • Mesoporous silica-supported titanium pillared clay photocatalyst and its preparation method and application
  • Mesoporous silica-supported titanium pillared clay photocatalyst and its preparation method and application

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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 belongs to the technical field of adsorption catalytic materials, and discloses a mesoporous silica gel-supported titanium pillared clay photocatalyst, a preparation method and application thereof. In the present invention, the titanium sol is added dropwise into the sodium-based clay, stirred, and the acid-pretreated activated silica gel is added after fully supporting the reaction, and the stirring is continued. After the silica gel in the mixed system is fully precipitated, the supernatant is filtered off, and the precipitate The titanium pillared clay photocatalyst supported by mesoporous silica gel is obtained after drying and calcining. The photocatalyst of the present invention not only has strong adsorption performance for organic pollutants, but also has strong photocatalytic activity, thereby realizing the integration of adsorption of organic pollutants and photocatalytic oxidation, so that the hydroxyl radicals generated on the surface of the catalyst It can effectively mineralize and degrade the organic pollutants adsorbed and enriched by the adsorption material in situ, greatly enhance the reaction rate and efficiency of photocatalytic degradation of organic pollutants, and can be used as an adsorbent or photocatalyst in the field of environmental protection.

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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Patent Type & Authority Patents(China)
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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