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A kind of sn base hydroxide type photocatalyst and its preparation method and application

A photocatalyst and hydroxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Complex preparation process, low benzene activity and other problems, to achieve the effect of high activity stability, simple preparation process, and improved degradation rate

Active Publication Date: 2016-08-17
HUAIBEI NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to provide a novel Sn-based hydroxide photocatalyst for photocatalytic degradation of benzene waste gas and its preparation method. The technical problem to be solved is TiO 2 Photocatalyst treatment of benzene has low activity, easy deactivation, and existing hydroxide-type photocatalysts with unsatisfactory activity, complex preparation process, and high cost

Method used

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  • A kind of sn base hydroxide type photocatalyst and its preparation method and application
  • A kind of sn base hydroxide type photocatalyst and its preparation method and application
  • A kind of sn base hydroxide type photocatalyst and its preparation method and application

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Effect test

Embodiment 1

[0029] This embodiment prepares MgSn(OH) according to the following steps 6 and ZnSn(OH) 6 :

[0030] a. Weigh 0.2mol (56.948g) Na with an electronic balance 2 SnO 3 4H 2 O, add deionized water to dissolve at 10°C, and then set the volume in a 2000mL volumetric flask to obtain Na with a concentration of 0.1mol / L 2 SnO 3 solution;

[0031]Weigh 0.05mol (10.165g) MgCl with an electronic balance 2 ·6H 2 O, add deionized water to dissolve at 10°C, and then set the volume in a 500mL volumetric flask to obtain MgCl with a concentration of 0.1mol / L 2 solution;

[0032] Weigh 0.05mol (6.815g) ZnCl with an electronic balance 2 , add deionized water to dissolve at 10°C, and then set the volume in a 500mL volumetric flask to obtain ZnCl with a concentration of 0.1mol / L 2 solution.

[0033] b. Take two groups of 20mL above-mentioned Na 2 SnO 3 The solution was placed in a constant pressure dropping funnel, and was added dropwise to 20mL MgCl at 10°C under vigorous stirring a...

Embodiment 2

[0041] In order to compare the influence of the hydrothermal reaction temperature on the performance of the photocatalyst, the present embodiment prepared MgSn(OH) by the same steps as in Example 1 6 and ZnSn(OH) 6 , the only difference is that the hydrothermal reaction temperature was changed to: 20°C, 90°C and 150°C respectively. From Figure 4 It can be seen that the XRD of the obtained product is not significantly different from that obtained at 120°C, both of which are cubic phases.

[0042] With ZnSn(OH) 6 For example, its degradability is tested in the same manner as in Example 1, and the result statistics are as follows: Figure 5 As shown, it can be seen from the figure that the degradation rate of the product obtained at any temperature is much higher than that of the P25 catalyst, and the product obtained at 120 ° C is the best, and each product also has a relatively high temperature. Good mineralization rate.

[0043] The obtained MgSn(OH) at each temperature ...

Embodiment 3

[0045] In order to compare the influence of the pH value of the solution on the performance of the photocatalyst, the present embodiment prepared MgSn(OH) by the same steps as in Example 1 6 and ZnSn(OH) 6 , the difference is only in the Na 2 SnO 3 The solution was added dropwise to MgCl 2 solution and ZnCl 2 After the solution, before the hydrothermal reaction, the pH of the mixed solution was adjusted to 4 and 7 with 0.1 mol / L hydrochloric acid, and the pH of the mixed solution was adjusted to 13 with 0.1 mol / L NaOH solution. From Figure 6 It can be seen that the resulting ZnSn(OH) 6 The XRD of the product obtained under the pH condition of Example 1 is basically the same as that of the product obtained in the cubic phase. And the obtained MgSn(OH) 6 When the product is at pH 7 or 13, the XRD of the product obtained under the pH condition of Example 1 is basically the same as that of the cubic phase; when the pH is 4, SnO 2 Miscellaneous.

[0046] With ZnSn(OH) 6 ...

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Abstract

The invention discloses a Sn-based hydroxide type photo-catalyst as well as a preparation method and application thereof. The Sn-based hydroxide type photo-catalyst is characterized in that the photo-catalyst is a double-metal hydroxide solid solution consisting of Mg<2+>, or Zn<2+> and Sn<4+>; the chemical formula of the catalyst is shown as MSn(OH)6; M represents Mg or Zn. The catalyst is synthesized by using a hydrothermal method. The catalyst is efficient and stable in optical catalytic degradation and mineralization activity on benzene under the ultraviolet light, so that the problems of low efficiency and a great possibility of depositing carbon and inactivating of a conventional TiO2 photo-catalyst when degrading the gaseous benzene. The photo-catalyst is simple in preparation method, low-cost and easily available in raw material, and efficient and stable in activity of removing benzene and has popularization and application potentials.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation and environmental pollutant treatment, in particular to a Sn-based hydroxide-type photocatalyst MSn(OH) for photocatalytic treatment of benzene-containing waste gas 6 (M is Mg or Zn) and a preparation method thereof. Background technique [0002] As an important chemical raw material and solvent, benzene is widely used in paint making, pharmaceuticals, shoemaking, furniture production and other fields. It is the most common invisible "killer" in indoor air. As a volatile organic pollutant, benzene waste gas enters the human body mainly through breathing, skin ingestion and ingestion. Short-term inhalation of a large amount of its vapor can cause acute poisoning, headache, vomiting, chest tightness, dizziness and other symptoms. Long-term exposure will lead to neurasthenia, hepatomegaly, dry skin and decreased hematopoietic organ function. [0003] The treatment methods of benzene waste g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/14B01D53/86B01D53/72
Inventor 付先亮陈士夫黄丹威秦永孟苏刚
Owner HUAIBEI NORMAL UNIVERSITY
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