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Method for preparing photocatalytic material with multi-component porous classification structure

A hierarchical structure, multi-component technology, applied in the field of photocatalysis, can solve the problems of limited popularization and application, and the application scope is not expanded to treat organic pollutants, and achieve the effects of low cost, excellent performance, simple and flexible process

Inactive Publication Date: 2012-10-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Although this technology has successfully prepared noble metal-doped metal oxide semiconductors, its application range has not been extended to the treatment of organic pollutants.
And described titanium dioxide is only the titanium dioxide powder with common appearance, therefore has limited the popularization and use of this technology greatly

Method used

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  • Method for preparing photocatalytic material with multi-component porous classification structure
  • Method for preparing photocatalytic material with multi-component porous classification structure
  • Method for preparing photocatalytic material with multi-component porous classification structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, the natural corn leaves were cleaned to remove surface dust, and then soaked in a freshly prepared PBS buffer solution (pH 7.2-7.4) at 4°C for 12 hours, washed with distilled water, and stored at 0°C until use. After taking it out, put it at room temperature and soak it in 5% HCl solution for 3 hours until the green leaves turn yellowish brown completely, and its scanning electron micrograph is as follows: figure 1 shown.

[0033] After cleaning the surface of the natural plant leaves, soaking in the metal precursor impregnation solution, hydrolyzing, and then calcining to obtain a metal oxide nanomaterial with a porous hierarchical structure; then, using the metal oxide nanomaterial as a matrix, the matrix material Further impregnating, drying and calcining in the noble metal precursor solution to obtain a composite material with a multi-component porous hierarchical structure.

[0034] Vacuum soak the above pretreated blades in 5% TiCl 3 24 hours in the aqueo...

Embodiment 2

[0038] Natural corn leaves were washed to remove surface dust, then soaked in freshly prepared PBS solution at 4°C for 12 hours, washed with distilled water, and stored at 0°C until use. After being taken out, the fixed leaves were further soaked in 5% HCl solution for 4 hours to carry out pickling treatment.

[0039] Under vacuum conditions, the leaves after the above pretreatment were soaked in 5% TiCl 3 Dehydration in the air after 24 hours in the aqueous solution; Afterwards, the leaves were placed in tetra-n-butyl titanate / absolute ethanol / acetylacetone solution (volume ratio: Ti(OBu) 4 :EtOH:acac=1.8:120:0.09) in vacuum impregnation for 12 hours, then hydrolyzed in air, and then dried in air; finally, the sample was sintered to 550°C to obtain porous graded TiO 2 .

[0040] Add 0.2 g of TiO to 10 mL of chloroauric acid aqueous solution (5 mmol / L, adjusted to pH 6 by NaOH) 2 , magnetically stirred at 70 °C for 2 h. Then, the obtained powder was centrifuged, washed wit...

Embodiment 3

[0043] First, the natural corn leaves were cleaned to remove surface dust, and then soaked in freshly prepared PBS solution at 4°C for 12 hours, washed with distilled water, and stored at 0°C until use. After taking it out, put it at room temperature and soak it in 5% HCl solution for 3 hours until the green leaves turn yellow completely. Under vacuum conditions, the pretreated leaves were treated in 5% TiCl 3 Soak in water for 24 hours. After the above immersion, the leaves were dehydrated in gradients, that is, they were sequentially soaked in 15%→30%→50%→70%→85%→95%→100% absolute ethanol for 30 minutes respectively. Then the blade after dehydration is in tetra-n-butyl titanate / dehydrated alcohol / acetylacetone solution (volume ratio is: Ti(OBu) 4 :EtOH:acac=1.8:120:0.09) after vacuum impregnation for 12 hours, placed in air for hydrolysis and drying. Finally the blades are sintered at 550°C.

[0044] Add 0.3g of TiO to 10mL of chloroauric acid aqueous solution (5mmol / L, ...

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Abstract

The invention discloses a method for preparing a photocatalytic material with a multi-component porous classification structure. The method includes firstly, cleaning and treating surfaces of natural plant leaves, and soaking the natural plant leaves in metal precursor steeping liquor to obtain a metal oxide base material with a nanometer structure via hydrolysis and calcination; and secondly, steeping, drying and calcining the base material in precious metal precursor liquor to obtain the composite material with the multi-component porous classification structure. The invention further relates to photocatalytic composite material with the multi-component porous classification and application of the photocatalytic composite material. The method is simple and flexible in process and low in cost, precious metal is doped into the metal oxide intrinsic conductor nanometer material with the porous classification structure so as to obtain the photocatalyst material with excellent performances, and the photocatalyst material can effectively catalytically decompose organic pollutant in visible light.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic material, in particular to a preparation method of a photocatalytic composite material with a multi-component porous hierarchical structure with plant structure characteristics. It belongs to the field of photocatalysis. Background technique [0002] Effective detection, separation and degradation of organic pollutants has become an urgent problem to be solved in sewage treatment. Metal oxide semiconductor materials are often used as photocatalytic oxidants to decompose refractory organic pollutants in water. Compared with the traditional water treatment technology that focuses on the separation, concentration and transfer of pollutants, this method of photocatalytic degradation of organic pollutants in water has obvious advantages such as energy saving, high efficiency, and recyclability. Therefore, it is a very promising method for treating organic pollutants in wastewater, which is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/10C02F1/30C02F101/30
CPCY02W10/37
Inventor 苏慧兰王冬舒陈建军张荻纳铭钰
Owner SHANGHAI JIAO TONG UNIV
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