Preparation method of two-stage particle nano SnO2 photocatalytic material

A photocatalytic material and photocatalytic technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the factors affecting the synthesis of harsh reaction conditions and excessive products , poor repeatability and other problems, to achieve the effect of easy control of reaction conditions, improvement of material preparation efficiency, and avoidance of varying degrees of corrosion

Active Publication Date: 2020-02-21
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have more or less disadvantages, such as cumbersome preparation process, complicated experimental equipment, harsh reaction conditions (high temperature and high pressure), a large number of chemical reactions, too many and difficult to control product synthesis factors, relatively poor repeatability etc.
For example, Chinese patent CN103332726B uses hydrothermal method to prepare SnO 2 , this method needs to be carried out under high temperature and high pressure conditions, which requires high equipment, and the preparation process involves a large amount of solvents and related chemical reactions, which has certain potential safety hazards
In addition, to obtain an ideal photocatalytic material, it needs to be realized through the joint regulation of solution composition, reaction temperature, pressure and time, which is technically difficult.
Chinese patent CN105948106B synthesizes SnO by precipitation method 2 , this method is difficult to solve the problem that the precipitation rate of metal ions in the solution does not match, and the order of solution addition, reaction temperature, deposition time, etc. during the preparation process will have a greater impact on the structure and dispersion of the product, making the material preparation reproducible decreased sex
Chinese patent CN103739007B uses template method to prepare SnO 2 , this method not only needs to prepare polystyrene bead template and precursor sol solution through a very complicated process, but also needs a high temperature environment to enable the product to be effectively synthesized on the template, the whole preparation process is very cumbersome, and the reaction conditions are very harsh

Method used

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  • Preparation method of two-stage particle nano SnO2 photocatalytic material
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  • Preparation method of two-stage particle nano SnO2 photocatalytic material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Select Cu and Sn raw materials with a purity of 99.99 wt.%, carry out proportioning and weighing according to the atomic percentage Cu: 70%, Sn: 30%, place the prepared metal raw materials in a vacuum electric arc furnace, and evacuate to 4.5 ×10 -3 Pa, then fill the furnace with argon gas with a purity of 99.9% and smelt in this atmosphere, each smelting time is 35 s, repeat 5 times, and the smelting current is 120 A to make Cu 70 sn 30 Alloy ingot;

[0033] (2) Use the magnetic induction coil in the vacuum spin quenching equipment to heat the alloy ingot obtained in step (1) under the protection of argon gas with a purity of 99.9%, and the heating power is 25 kW. When the alloy is completely melted, the air pressure valve is opened, and the alloy liquid is sprayed onto the surface of the copper roller rotating at 27.5 m / s to form Cu 70 sn 30 Alloy short belt;

[0034] (3) Cu obtained in step (2) 70 sn 30The alloy short strips were placed in a beaker filled ...

Embodiment 2

[0038] (1) Select Cu and Sn raw materials with a purity of 99.99 wt.%, carry out proportioning and weighing according to the atomic percentage Cu: 70%, Sn: 30%, place the prepared metal raw materials in a vacuum electric arc furnace, and evacuate to 4.5 ×10 -3 Pa, then fill the furnace with argon gas with a purity of 99.9% and smelt in this atmosphere, each smelting time is 35 s, repeat 5 times, and the smelting current is 120 A to make Cu 70 sn 30 Alloy ingot;

[0039] (2) Use the magnetic induction coil in the vacuum spin quenching equipment to heat the alloy ingot obtained in step (1), under the protection of argon gas with a purity of 99.9%, and the heating power is 25 kW. When the alloy is completely melted, open the air pressure valve, The alloy liquid was sprayed onto the surface of the copper roller rotating at 27.5 m / s to form Cu 70 sn 30 Alloy short belt;

[0040] (3) Cu obtained in step (2) 70 sn 30 The alloy short strips were placed in a beaker filled with a...

Embodiment 3

[0044] (1) Select Cu and Sn raw materials with a purity of 99.99 wt.%, and carry out proportioning and weighing according to the atomic percentage Cu: 90% and Sn: 10%. The prepared metal raw materials are placed in a vacuum electric arc furnace and vacuumed to 4.9 ×10 -3 Pa, then fill the furnace with argon gas with a purity of 99.9% and smelt in this atmosphere, each smelting time is 40 s, repeat 4 times, and the smelting current is 160 A to make Cu 90 sn 10 Alloy ingot;

[0045] (2) Use the magnetic induction coil in the vacuum spin quenching equipment to heat the alloy ingot obtained in step (1) under the protection of argon gas with a purity of 99.9%, and the heating power is 30 kW. When the alloy is completely melted, the air pressure valve is opened, and the alloy liquid is sprayed onto the surface of the copper roller with a rotation speed of 29.3 m / s to form Cu 90 sn 10 Alloy short belt;

[0046] (3) Cu obtained in step (2) 90 sn 10 The alloy short strips were p...

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Abstract

The invention discloses a preparation method of a two-stage particle nano SnO2 photocatalytic material. According to the method, a Cu-Sn alloy short strip of specific proportion is used as a precursor, a nitric acid solution is used both as a corrosive agent and an oxidizing agent, copper atoms in the alloy are removed through the corrosion effect of nitric acid, so that tin atoms in the alloy areexposed to realize continuous oxidation of nitric acid to tin element. The method solves the problems that pure tin easily forms a surface protective film in the nitric acid solution and the reactioncan hardly be carried out continuously. Besides, the preparation process does not involve complex experimental equipment and high-temperature reaction condition, the influence factors of product synthesis are few, the reaction conditions are easy to control, the process is obviously superior to the traditional photocatalytic material synthesis method, and room-temperature / rapid preparation of nano SnO2 is achieved. The prepared sample is extremely high in purity and has a fine two-stage nanoparticle structure, the particle size of a minimum unit is as small as 6nm or below, and the catalyticdegradation efficiency of the rhodamine B dye under ultraviolet light reaches 99% or above.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, in particular to a two-stage particle nano SnO 2 Preparation methods of photocatalytic materials. Background technique [0002] Tin dioxide (SnO 2 ) as a high-potential wide-bandgap n-type semiconductor multifunctional material with a band gap of 3.6eV has attracted extensive attention in the fields of gas sensors, lithium-ion batteries, solar cells, and photocatalytic degradation. Especially in photocatalytic degradation of organic pollutants, SnO 2 It has great advantages, not only high catalytic activity, stable chemical properties, but also low price, green and pollution-free, so it has become an important research hotspot in the field of photocatalytic degradation. [0003] Traditional SnO 2 Preparation methods include hydrothermal method, precipitation method, template method and so on. However, these methods have more or less disadvantages, such as cumberso...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B01J23/835B01J35/02B01J35/00
CPCB01J23/835B01J35/50B01J35/23B01J35/40B01J35/39Y02W10/37
Inventor王宁
OwnerNANJING INST OF TECH