MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst as well as preparation method and application thereof

A hydrotalcite, visible light technology, used in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the harsh synthesis conditions of hydrotalcite, cannot completely remove pollutants, problems such as low utilization of visible light, to achieve the effect of facilitating large-scale production, the preparation process is green and environmentally friendly, and no special equipment is required

Active Publication Date: 2016-07-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the synthesized hydrotalcites are mainly used as adsorbents, and adsorption is only a physical treatment method, which cannot completely remove pollutants; although a small amount of hydrotalcites are used as catalysts, their catalysis occurs under ultraviolet light conditions. The utilization rate of visible light is low, which increases the processing cost and is not convenient for practical application; in addition, the synthesis conditions of some hydrotalcites are harsh (high temperature and high pressure), which does not use practical application.

Method used

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  • MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst as well as preparation method and application thereof
  • MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst as well as preparation method and application thereof
  • MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst as well as preparation method and application thereof

Examples

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Embodiment 1

[0050] A kind of MgZnCr-TiO of the present invention 2 Hydrotalcite-like visible light catalyst, the MgZnCr-TiO 2 The hydrotalcite-like visible light catalyst includes carbonate-type magnesium-zinc-chromium-like hydrotalcite and titanium dioxide, and the titanium dioxide is supported on the carbonate-type magnesium-zinc-chromium-like hydrotalcite. The MgZnCr-TiO 2 The hydrotalcite-like visible photocatalyst has a lamellar structure. The MgZnCr-TiO 2 The hydrotalcite-like visible light catalyst is mainly composed of MgCl 2 , ZnCl 2 , CrCl 3 Mixed metal salt solution A, NaOH, Na 2 CO 3 The mixed alkali solution B and nano-TiO 2 Aqueous suspensions are prepared by co-precipitation.

[0051] A kind of MgZnCr-TiO of the above-mentioned embodiment of the present invention 2 A method for preparing a hydrotalcite-like visible light catalyst, and a preparation device such as figure 1 shown, including the following steps:

[0052] (1) Take 1.0165gMgCl 2 ·6H 2 O, 0.6815g Zn...

Embodiment 2

[0064] A kind of MgZnCr-TiO of the present invention 2 The application of hydrotalcite-like visible light catalyst in photocatalytic degradation of dye wastewater comprises the following steps:

[0065] (1) get the MgZnCr-TiO in 0.05g embodiment 1 2 The hydrotalcite-like visible light catalyst was added to 100mL of Congo red solution with an initial concentration of 100mg / L, placed in the dark and stirred at a stirring speed of 800rpm for 0.5h to make MgZnCr-TiO 2 The hydrotalcite-like visible photocatalyst reaches adsorption equilibrium, and a mixed solution is obtained.

[0066] (2) Under normal temperature and pressure, place the mixed solution in step (1) under the irradiation of a xenon lamp light source (with 300W, a xenon lamp with a filter to simulate a visible light source) and carry out photocatalytic degradation for 180min to complete the Congo red solution. degradation.

[0067] The principle of Congo red degradation is as follows: under dark conditions, Congo r...

Embodiment 3

[0078] A kind of MgZnCr-TiO of the present invention 2 The preparation method of the hydrotalcite-like visible light catalyst is basically the same as that of Example 1, except that the molar ratio of Mg:Zn:Cr=1:2:1 in the mixed metal salt solution A of this example. The MgZnCr-TiO prepared in this example 2 The hydrotalcite-like visible light catalyst is used to treat the Congo red solution, and the application method is the same as in Example 2. Figure 10 It is the relationship diagram of the removal effect of Congo red solution with time. From Figure 10 As can be seen in the figure, when the photocatalytic degradation is 30min, the removal rate of Congo red is 44.4%, and when the degradation is 90min, the removal rate of Congo red has reached 59.8%, which shows that the MgZnCr-TiO of the present invention 2 The hydrotalcite-like visible light catalyst can effectively degrade Congo red.

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Abstract

The invention discloses an MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst as well as a preparation method and application thereof. The MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst comprises carbonate type magnesium-zinc-chromium hydrotalcite and titanium dioxide which is loaded on the carbonate type magnesium-zinc-chromium hydrotalcite. The preparation method for the MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst comprises the following steps: carrying out coprecipitation reaction by taking hydrochlorides of magnesium, zinc and chromium (III) as well as sodium hydroxide, anhydrous sodium carbonate and titanium dioxide as raw materials; and then, carrying out hydrothermal crystallization treatment. The MgZnCr-TiO2 hydrotalcite visible-light-induced photocatalyst disclosed by the invention has the advantages of being great in specific surface area, great in adsorbing capacity, good in absorption of visible light, and the like, can be widely used for photocatalytic degradation of dye wastewater, has very good adsorption capacity and photocatalytic degradation capacity, can completely remove pollutants, and is relatively good in reutilization.

Description

technical field [0001] The invention relates to a visible light catalyst, in particular to a MgZnCr-TiO 2 Hydrotalcite-like visible light catalyst and its preparation method and application. Background technique [0002] With the continuous development of human civilization and science and technology, the human world has stepped into a colorful world from a simple black and white world, all thanks to the emergence of synthetic dyes. However, while synthetic dyes bring colorful colors to the human world, they also cause great damage to the living environment of human beings, especially azo direct dyes. Since the dyeing process does not require a mordant, the dyes are easily lost and enter the water body. ;Because of its acid resistance, alkali resistance and refractory biodegradation, it will stay in nature for a long time; because of its color, it will affect the sunlight through the water layer and affect the photosynthesis of aquatic plants; in addition, some dyes are als...

Claims

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Application Information

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IPC IPC(8): B01J23/26C02F1/30
CPCC02F1/30B01J21/063B01J21/10B01J23/06B01J23/26C02F2101/308C02F2305/10B01J35/39Y02W10/37
Inventor 张长马驰魏婧婧于志刚李永球
Owner HUNAN UNIV
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