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TiO2-CaTaO2N composite photocatalyst and preparation method thereof

A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as low catalytic efficiency, achieve simple preparation methods, reduce recombination probability, and improve photocatalysis active effect

Inactive Publication Date: 2015-06-03
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, TiO 2 Photocatalysts are easy to recombine photogenerated electrons and holes during the photocatalytic process, and the catalytic efficiency is low

Method used

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  • TiO2-CaTaO2N composite photocatalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Add tantalum pentachloride, calcium carbonate and citric acid with the amount of 0.01mol, 0.01mol and 0.1mol respectively to 100mL of anhydrous methanol to form a mixed solution A, and add it to the mixed solution A under the condition of stirring Add 0.5 mol of ethylene glycol to obtain a mixed solution B, then keep the mixed solution B in a water bath at 30°C for 2 hours to obtain a wet gel, and dry the wet gel at 120°C to obtain a dry gel;

[0013] (2) Calcining the xerogel obtained in step (1) at 500°C for 2 hours in an air atmosphere, and then calcining at 1000°C for 10 hours in an ammonia atmosphere to obtain CaTaO 2 N powder;

[0014] (3) Mix 21.1 mL (0.06 mol) of tetrabutyl titanate and 0.01 mol of CaTaO obtained in step (2) under stirring conditions 2 N powder was added to 42.2mL absolute ethanol to form mixed solution C;

[0015] (4) Mix 42.2mL of absolute ethanol and 42.2mL of citric acid solution with a mass concentration of 40% to form a mixed solutio...

Embodiment 2

[0019] (1) Add tantalum pentachloride, calcium carbonate and citric acid with the amount of 0.01mol, 0.01mol and 0.1mol respectively to 50mL of anhydrous methanol to make a mixed solution A, and add it to the mixed solution A under the condition of stirring Add 0.5 mol of ethylene glycol to obtain a mixed solution B, then keep the mixed solution B in a water bath at 30°C for 2 hours to obtain a wet gel, and dry the wet gel at 120°C to obtain a dry gel;

[0020] (2) Calcining the xerogel obtained in step (1) at 500°C for 2 hours in an air atmosphere, and then calcining at 1000°C for 10 hours in an ammonia atmosphere to obtain CaTaO 2 N powder;

[0021] (3) Mix 35.2 mL (0.1 mol) of tetrabutyl titanate and 0.01 mol of CaTaO obtained in step (2) under stirring conditions 2 N powder was added to 70.4mL of absolute ethanol to form a mixed solution C;

[0022] (4) Mix 70.4mL of absolute ethanol and 70.4mL of citric acid solution with a mass concentration of 40% to form a mixed solu...

Embodiment 3

[0026] (1) Add tantalum pentachloride, calcium carbonate and citric acid with the amount of 0.01mol, 0.01mol and 0.1mol respectively to 25mL of anhydrous methanol to make mixed solution A, and add it to mixed solution A under the condition of stirring Add 0.5 mol of ethylene glycol to obtain a mixed solution B, then keep the mixed solution B in a water bath at 30°C for 2 hours to obtain a wet gel, and dry the wet gel at 120°C to obtain a dry gel;

[0027] (2) Calcining the xerogel obtained in step (1) at 500°C for 2 hours in an air atmosphere, and then calcining at 1000°C for 10 hours in an ammonia atmosphere to obtain CaTaO 2 N powder;

[0028] (3) Mix 56.4 mL (0.16 mol) of tetrabutyl titanate and 0.01 mol of CaTaO obtained in step (2) under stirring conditions 2 N powder was added to 112.8mL of absolute ethanol to form a mixed solution C;

[0029] (4) Mix 112.8mL of absolute ethanol and 112.8mL of 40% citric acid solution to form mixed solution D;

[0030] (5) Add the mix...

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Abstract

The invention discloses a TiO2-CaTaO2N composite photocatalyst and a preparation method thereof, belonging to the field of inorganic functional materials. The technical scheme is as follows: the TiO2-CaTaO2N composite photocatalyst is compounded from TiO2 powder and CaTaO2N powder in a mole ratio of (6-16):1. The invention also discloses a preparation method of the TiO2-CaTaO2N composite photocatalyst. The compounding of the TiO2 and CaTaO2N can greatly widen the spectral response range of TiO2, so that the TiO2 has favorable absorptivity in the visible light region, thereby enhancing the utilization ratio of solar energy; and besides, the compounding of the TiO2 and CaTaO2N can effectively reduce the compound probability between photogenerated electrons and holes, and enhance the photocatalytic activity of the TiO2.

Description

technical field [0001] The invention belongs to the technical field of inorganic environmental protection photocatalytic materials, in particular to a TiO 2 -CaTaO 2 N composite photocatalyst and preparation method thereof. Background technique [0002] With the progress of industry and social development, the discharge of industrial wastewater is also increasing day by day, which has posed a major threat to human survival and sustainable social development, and has become the world's number one environmental governance problem. As an advanced oxidation technology, semiconductor photocatalysis technology can completely mineralize many refractory organic substances in wastewater, and has the advantages of fast reaction speed, high degradation efficiency, simple operation and no secondary pollution, etc., which has opened up new opportunities for the treatment of industrial wastewater. new way. Among many semiconductor photocatalytic materials, TiO 2 Photocatalysts have ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
Inventor 刘玉民吕华李紫金汤海波丁志伟李爽
Owner HENAN NORMAL UNIV
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