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Method for preparing ZnFeCr hydrotalcite photocatalyst

A catalyst, stone light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as high cost and excitation wavelength limitation

Inactive Publication Date: 2014-03-05
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 The main bottleneck for photocatalytic applications is the limitation of the excitation wavelength, due to the 2 The excitation wavelength is 387 nm, which belongs to the ultraviolet region. Only mercury lamps or ultraviolet lamps can be used as light sources, and the cost is very high.

Method used

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  • Method for preparing ZnFeCr hydrotalcite photocatalyst
  • Method for preparing ZnFeCr hydrotalcite photocatalyst
  • Method for preparing ZnFeCr hydrotalcite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The XRD spectrum of the prepared ZnFeCr hydrotalcite is shown in the attached figure 1 . It can be seen that the prepared photocatalyst has typical hydrotalcite characteristic diffraction peaks.

[0023] The UV-Vis spectrogram of the prepared ZnFeCr hydrotalcite is shown in the attached figure 2 . It can be seen that the prepared photocatalyst has visible light response.

[0024] A 500 W long-arc xenon lamp (wavelength > 400 nm) is used as a simulated visible light source. The effective length of the visible light source lamp tube is 6 cm, and the light intensity is 1.5 kW / m 2 . The xenon lamp is placed in the quartz sleeve, and cooling water is passed through the interlayer of the sleeve to keep the reaction solution at a constant temperature. At 25 °C, 150 ml of methyl orange solutions of different concentrations and 1.25 g / L catalyst were added into the beaker. Before photocatalysis, stir in the dark for 2 h to allow the catalyst adsorption-dissociation to rea...

Embodiment 2

[0026] When the initial concentration of methyl orange is 30 mg / L, different catalyst concentrations are used to photocatalytically degrade methyl orange. Other photocatalytic performance test steps are the same as in Example 1. The test results are shown in the attached image 3 .

[0027] attached image 3 The results show that the prepared ZnFeCr hydrotalcite photocatalyst has a good methyl orange degradation effect.

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Abstract

The invention discloses a method for preparing a ZnFeCr hydrotalcite photocatalyst and relates to preparation methods of catalysts. The method comprises the following preparation steps of (1) preparing a salt solution of ferric nitrate, zinc nitrate and chromic nitrate, wherein the ratio of n(Zn) to n(Fe) to n(Cr) is 1: 1: 1, and the total concentration of metal ions is 1M; (2) preparing a 0.5M solution of sodium hydroxide (NaOH) and sodium carbonate (Na2CO3), wherein the ratio of NaOH to Na2CO3 is 2: 1; (3) simultaneously dropwise adding a metal salt solution and an alkali solution into the salt solution, and controlling the pH value to be 9-10; (4) carrying out hydrothermal crystallization on slurry, obtained after the dropwise adding is ended, for 24 hours at the temperature of 100 DEG C, then, filtrating, washing and drying, thereby obtaining the product. According to the method, the product has good performance in photocatalytic degradation of organic substances; the ZnFeCr hydrotalcite photocatalyst prepared by the method is low in cost, simple and convenient in operation and easy in large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a ZnFeCr hydrotalcite photocatalyst. Background technique [0002] With the development of industry and the continuous improvement of people's living standards, the problem of environmental pollution has become increasingly serious, and people have paid more and more attention to purification of harmful gases and sewage treatment. Most of the current conversion treatment methods in sewage treatment are aimed at pollutants with large discharge volume and high concentration, and they are powerless to purify pollutants with low concentration and difficult to transform in water bodies. The photocatalytic degradation technology gradually developed in recent years provides a good way to solve this problem. Studies in recent years have shown that photocatalytic reactions can treat wastewater containing dyes, pesticides, halogenated organic compounds, sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86C02F1/30
Inventor 申延明薛源明李士凤刘东斌樊丽辉宁志高
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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