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Method for preparing tantalum oxynitride photocatalytic material by using waste tantalum capacitor

A photocatalytic material and tantalum capacitor technology, which is applied in the field of waste tantalum capacitor recycling, can solve the problems of high-purity tantalum oxide being expensive, the industrial application limitation of TaON photocatalytic material, etc., achieve broad application prospects and economic benefits, reduce tantalum Ore needs, the effect of high photocatalytic activity

Active Publication Date: 2018-12-07
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-purity tantalum oxide is expensive, which limits the industrial application of TaON photocatalytic materials.

Method used

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  • Method for preparing tantalum oxynitride photocatalytic material by using waste tantalum capacitor
  • Method for preparing tantalum oxynitride photocatalytic material by using waste tantalum capacitor

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Effect test

Embodiment 1

[0031] The method for preparing a visible light-responsive TaON photocatalytic material with waste tantalum capacitors described in the application of the present invention comprises the following steps:

[0032] 1. Mechanical crushing: Take 10g of resin-encapsulated waste tantalum capacitors with a tantalum content of 35.9%. The analysis results are as follows: Ta: 35.9%, Ag: 0.3%, Ni: 2.08%, Fe: 3.85%. Use a ball mill to crush waste tantalum capacitors to obtain materials with an average particle size of 0.5-0.01mm;

[0033] 2. Electrostatically sort the crushed materials to separate metal and non-metal;

[0034] 3. Magnetically separate metal materials to separate nickel and iron; then sieve to obtain Ta-enriched powder;

[0035] 4. Put the Ta-enriched powder in a tube furnace for chlorination to obtain TaCl 5 . Control the flow rate of argon gas to 50ml / min, the mass ratio of Ta-enriched powder to chloride salt is 1:1, the reaction temperature is 500°C, and the reaction...

Embodiment 2

[0048] The method for preparing a visible light-responsive TaON photocatalytic material with waste tantalum capacitors described in the application of the present invention comprises the following steps:

[0049] 1. Mechanical crushing: Take 10g of resin-encapsulated waste tantalum capacitors with a tantalum content of 35.9%. The analysis results are as follows: Ta: 35.9%, Ag: 0.3%, Ni: 2.08%, Fe: 3.85%. Use a hammer crusher to crush waste tantalum capacitors to obtain materials with an average particle size of 0.5-0.01mm;

[0050] 2. The crushed material is subjected to hydrocyclone separation to separate metal and non-metal;

[0051] 3. Magnetically separate metal materials to separate nickel and iron; then sieve to obtain Ta-enriched powder;

[0052] 4. Put the Ta-enriched powder in a tube furnace for chlorination to obtain TaCl 5 . Control the flow rate of argon gas to 80ml / min, the mass ratio of Ta-enriched powder to chloride salt is 1:2, the reaction temperature is 60...

Embodiment 3

[0058] The method for preparing a visible light-responsive TaON photocatalytic material with waste tantalum capacitors described in the application of the present invention comprises the following steps:

[0059] 1. Mechanical crushing: Take 10g of resin-encapsulated waste tantalum capacitors with a tantalum content of 35.9%. The analysis results are as follows: Ta: 35.9%, Ag: 0.3%, Ni: 2.08%, Fe: 3.85%. Use a hammer crusher to crush waste tantalum capacitors to obtain materials with an average particle size of 0.5-0.01mm;

[0060] 2. Electrostatically sort the crushed materials to separate metal and non-metal;

[0061] 3. Magnetically separate metal materials to separate nickel and iron; then sieve to obtain Ta-enriched powder;

[0062] 4. Put the Ta-enriched powder in a tube furnace for chlorination to obtain TaCl 5 . Control the flow rate of argon gas to 100ml / min, the mass ratio of Ta-enriched powder to chloride salt is 1:3, the reaction temperature is 650°C, and the re...

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Abstract

Provided is a method for preparing an oxygen tantalum nitride photocatalytic material by means of waste tantalum capacitors. The method comprises the following steps that various waste tantalum capacitors are subjected to mechanical crushing and decladding; metal and nonmetal are separated; metal materials are subjected to magnetic separation, and ferro-nickel magnetic materials are separated; screening is conducted, and tantalum-containing powder is obtained; the tantalum-containing powder is subjected to chlorination treatment, and tantalum chloride is obtained; tantalum chloride is dissolved into an alcoholic solution, ammonia gas is introduced to separate ammonium chloride out, filtration is conducted, and an alcoholic solution of tantalum is obtained; the alcoholic solution of tantalum is hydrolyzed, tantalum oxide sol is obtained, drying is conducted, and tantalum oxide gel is obtained; the tantalum oxide gel is subjected to high-temperature calcination in ammonia gas atmosphere, and the oxygen tantalum nitride photocatalytic material is obtained. The method for preparing the oxygen tantalum nitride photocatalytic material by means of the waste tantalum capacitors has the advantages that the waste tantalum capacitors in the market are utilized, requirements of photocatalytic tantalum material preparation on tantalite ore are reduced, and nickel and iron electrodes in the waste tantalum capacitors are recycled.

Description

technical field [0001] The invention relates to the technical field of recycling waste tantalum capacitors, in particular to a method for preparing visible light-responsive tantalum oxynitride photocatalytic materials by using waste tantalum capacitors. Background technique [0002] At present, semiconductor photocatalysts have been widely used in the degradation of organic matter, water treatment, air purification, etc., but many semiconductors with stable chemical properties and excellent performance often have a wide band gap and can only absorb ultraviolet light in the region. 4% of sunlight. Therefore, the development of high-efficiency photocatalysts with visible light response has important theoretical significance and practical value. TaON has a narrow band gap (2.5eV), is stable during photocatalytic reactions, and can release hydrogen and oxygen simultaneously in a solution containing suitable electron donors and acceptors. Moreover, the conduction band potential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B21/082C01B3/04
CPCB01J27/24C01B3/042C01B21/0821C01P2006/80Y02E60/36
Inventor 许振明牛博陈振洋
Owner SHANGHAI JIAOTONG UNIV
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