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Niobium and lead codoped palladium-loaded titanium dioxide/barium titanate nano heterojunction photocatalyst preparation method

A technology of titanium dioxide and photocatalyst, which is applied in the field of lead co-doping, can solve the problems of environmental pollution of waste acid and waste liquid, and achieve the effect of realizing reuse, realizing environmental protection and simple operation

Active Publication Date: 2018-11-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the valuable metals can be recovered, there are environmental pollution problems such as waste acid and waste liquid in the recovery process

Method used

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  • Niobium and lead codoped palladium-loaded titanium dioxide/barium titanate nano heterojunction photocatalyst preparation method
  • Niobium and lead codoped palladium-loaded titanium dioxide/barium titanate nano heterojunction photocatalyst preparation method
  • Niobium and lead codoped palladium-loaded titanium dioxide/barium titanate nano heterojunction photocatalyst preparation method

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Effect test

Embodiment 1

[0024] The method for in-situ preparation of niobium-lead co-doped and palladium-loaded titanium dioxide / barium titanate nano-heterojunction photocatalyst by using waste multilayer ceramic capacitors according to the present invention comprises the following steps:

[0025] 1. Mechanical ball milling and screening of waste multilayer ceramic capacitors, the average particle size of the material is ~0.075mm, and then magnetic separation to separate nickel and iron;

[0026] 2. Evenly mix the powder after magnetic separation with sodium chloride at a mass ratio of 1:1, and then carry out chlorination treatment. The oxygen flow rate was controlled to 50ml / min, the reaction temperature was 400°C, and the reaction time was 4h.

[0027] 3. Filter the residue after the chlorination reaction through deionized water and sodium thiosulfate to separate barium chloride and silver chloride;

[0028] 4. Dry the filtered residue at 120° C. to obtain a niobium-lead co-doped titanium dioxide / ...

Embodiment 2

[0030] The method for in-situ preparation of niobium-lead co-doped and palladium-loaded titanium dioxide / barium titanate nano-heterojunction photocatalysts described in the application of the present invention comprises the following steps:

[0031] 1. Mechanical ball milling and screening of waste multilayer ceramic capacitors, the average particle size of the material is ~0.075mm, and then magnetic separation to separate nickel and iron;

[0032] 2. Evenly mix the powder after magnetic separation with ammonium chloride at a mass ratio of 1:2, and then carry out chlorination treatment. The oxygen flow rate is controlled to 80ml / min, the reaction temperature is 500°C, and the reaction time is 2h.

[0033] 3. Filter the residue after the chlorination reaction through deionized water and sodium thiosulfate to separate barium chloride and silver chloride;

[0034] 4. Dry the filtered residue at 120° C. to obtain a niobium-lead co-doped titanium dioxide / barium titanate nano-heter...

Embodiment 3

[0036] The method for in-situ preparation of niobium-lead co-doped and palladium-loaded titanium dioxide / barium titanate nano-heterojunction photocatalysts described in the application of the present invention comprises the following steps:

[0037] 1. Mechanical ball milling and screening of waste multilayer ceramic capacitors, the average particle size of the material is ~0.075mm, and then magnetic separation to separate nickel and iron;

[0038] 2. Evenly mix the powder after magnetic separation with ferrous chloride at a mass ratio of 1:3, and then carry out chlorination treatment. The oxygen flow rate is controlled to 100ml / min, the reaction temperature is 600°C, and the reaction time is 0.5h.

[0039] 3. Filter the residue after the chlorination reaction through deionized water and sodium thiosulfate to separate barium chloride and silver chloride;

[0040] 4. Dry the filtered residue at 120° C. to obtain a niobium-lead co-doped titania catalyst with a particle size of ...

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Abstract

The invention relates to a niobium and lead codoped palladium-loaded titanium dioxide / barium titanate nano heterojunction photocatalyst preparation method. The preparation method comprises the following steps: mechanically ball milling and screening waste multilayer ceramic capacitors and then magnetically separating ferronickel out; performing chlorination-leaching treatment on magnetically separated powder to obtain niobium and lead codoped palladium-loaded titanium dioxide / barium titanate nano heterojunction. According to the preparation method disclosed by the invention, the waste multilayer ceramic capacitors which are cheap and easy to obtain are utilized as a raw material for preparing a catalyst; thus, waste reutilization is achieved, and a photocatalyst with high added value can be prepared out in a low cost mode. Meanwhile, the prepared nano heterojunction catalyst has good visible light response and high catalytic activity and has a wide application prospect and economical benefits in the aspects of hydrogen production through photocatalytically splitting water, air purification, sewage treatment and the like.

Description

technical field [0001] The present invention relates to the technical field of recycling waste multilayer ceramic capacitors, in particular to a method for in-situ preparation of niobium-lead co-doped and palladium-loaded titanium dioxide / barium titanate nano-heterojunction photocatalysts using waste multilayer ceramic capacitors . Background technique [0002] At present, semiconductor photocatalysts have been widely used in the degradation of organic matter, water treatment, air purification and so on. Titanium dioxide is considered to be a very promising photocatalyst due to its low cost, non-toxicity and stable chemical properties. However, in fact, titanium dioxide has certain limitations in photocatalytic applications because of its low solar light utilization efficiency (band gap: 3.2 eV, only responding to ultraviolet light) and low photocatalytic activity (photogenerated carriers quickly complex). In order to solve the above problems, surface modification of tita...

Claims

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Application Information

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IPC IPC(8): B01J23/648C01B3/04
CPCC01B3/042B01J23/6484C01B2203/0277B01J2523/00B01J35/39B01J2523/44B01J2523/25B01J2523/47B01J2523/56Y02E60/36
Inventor 许振明牛博
Owner SHANGHAI JIAO TONG UNIV
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