Method of preparing high-activity photocatalyst zinc magnesium composite oxide for degradation of organic dyes

A technology of composite oxides and photocatalysts, applied in chemical instruments and methods, water treatment of special compounds, physical/chemical process catalysts, etc.

Active Publication Date: 2019-07-09
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing photocatalysts, the purpose of the present invention is to provide a method for preparing a highly active organic dye degraded photocatalyst zinc-magnesium composite oxide, using soluble magnesium salts, soluble zinc salts and soluble carbonates as raw materials. It is dissolved and transferred to a reaction bottle, and reacted at a temperature higher than 70°C, and the morphology of the zinc-magnesium composite oxide is controlled by adjusting technical parameters such as the ratio of zinc-magnesium soluble salts, stirring time, reaction temperature and reaction time and composition, the obtained product can be collected and calcined at a high temperature to obtain a micron-sized, spherical zinc-magnesium composite oxide Mg 0.8 Zn 0.2 O photocatalyst, the method of the present invention has the advantages of simple preparation process, easy access to raw materials, controllable morphology of the synthesized zinc-magnesium composite oxide, high degradation efficiency of organic dyes, good reutilization rate, and the use effect within the range of extreme pH value Good features, can meet the needs of organic pollutants in wastewater treatment at home and abroad

Method used

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  • Method of preparing high-activity photocatalyst zinc magnesium composite oxide for degradation of organic dyes
  • Method of preparing high-activity photocatalyst zinc magnesium composite oxide for degradation of organic dyes
  • Method of preparing high-activity photocatalyst zinc magnesium composite oxide for degradation of organic dyes

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Embodiment 1

[0022] The preparation method of the present embodiment comprises:

[0023] Accurately weigh 0.04mol of Mg(NO 3 ) 2 ·6H 2 O and 0.01mol of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 50mL deionized water to obtain A solution, and then weighed 0.05mol Na 2 CO 3 Dissolve in 100mL deionized water to obtain solution B, adjust the pH values ​​of the above two solutions to 3.8 and 12.0 respectively; then transfer solution A to a 250mL three-neck round bottom flask and heat to 80°C, under vigorous stirring, Quickly add solution B heated to 80°C into solution A within 4-5s and continue to stir for 3.5 minutes, then leave it to age for 10 hours at a temperature of 80°C, the obtained white precipitate is filtered, washed, After drying at 70°C, spherical Mg with a size of 36 μm was obtained 0.8 Zn 0.2 O particles, put them into a muffle furnace for roasting, the roasting atmosphere is static air, the roasting temperature is 600°C, the heating rate is 5°C / min, and the roasting time is 3...

Embodiment 2

[0026] With the preparation method of Example 1, the difference is to accurately weigh 0.020mol of Mg(NO 3 ) 2 ·6H 2 O, 0.005mol Zn(NO 3 ) 2 ·6H 2 O and 0.025mol Na 2 CO 3 , the zinc-magnesium composite oxide obtained by high-temperature roasting is irradiated with ultraviolet light, and it is effective against 300mg L -1 The photodegradation efficiency of the methylene blue aqueous solution can reach more than 80%.

Embodiment 3

[0028] With the preparation method of Example 1, the difference is to accurately weigh 0.040mol of Mg(NO 3 ) 2 ·6H 2 O, 0.010mol of Zn(NO 3 ) 2 ·6H 2 O and 0.050mol Na 2 CO 3 , the zinc-magnesium composite oxide obtained by 500 ℃ high-temperature roasting is irradiated with ultraviolet light, and it is 300mg L -1 The photodegradation efficiency of the methylene blue aqueous solution can reach more than 90%.

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Abstract

The invention discloses a method of preparing a high-activity photocatalyst zinc magnesium composite oxide for degradation of organic dyes. Mg(NO3)2.6H2O and Zn(NO3) 2.6H2O are weighed and dissolved in deionized water to get a solution A. Na2CO3 is weighed and dissolved in deionized water to get a solution B. The pH values of the solutions A and B are adjusted respectively. Then a Mg (NO3)2 solution is heated, a Na2CO3 solution is quickly added to the Mg(NO3)2 solution under vigorous stirring, and stirring is continuously conducted for 2.0-6.0 min. A white precipitate is obtained after standing and ageing, and flower-like aMgCO3.bZnCO3.cMg(OH)2.dZn(OH)2.eH2O is prepared after the white precipitate is subjected to filtration, washing and drying. The flower-like aMgCO3.bZnCO3.cMg(OH)2.dZn(OH)2.eH2O is roasted in a muff furnace, and finally a high-activity spherical zinc magnesium composite oxide Mg0.8Zn0.2O catalyst with a diameter of 36 [mu]m is obtained. The invention has the advantages that the preparation method is simple, raw materials are easy to obtain, and the prepared Mg0.8Zn0.2O catalyst has high activity and a high repeated utilization ratio. Under the irradiation of ultraviolet or visible light, the prepared catalyst has higher catalytic degradation activity for organic dyes in aqueous solutions and better degradation activity for organic dyes.

Description

technical field [0001] The invention belongs to the field of preparation methods of inorganic catalysts, in particular to a preparation method of highly active organic dye degraded photocatalyst zinc-magnesium composite oxide. [0002] technical background [0003] As a green and promising technology, photocatalytic redox reaction centered on semiconductor materials and solar energy has attracted widespread attention in the fields of energy, materials, environment and chemistry in recent years. Since 1972, Fujishima and Honda [Nature 1972, 238 (5358), 37-38] first reported TiO 2 After the Fujishima-Honda effect of the photoelectrode, people have developed many novel semiconductor photocatalytic materials (such as metal oxides [Chemical Society Reviews 2009,38(1), 253-278], sulfides [Nature Communications 2013,4,2278 ], nitrogen oxides[Nature2006,440,295], metal-free semiconductor materials[Science 2015,347(6225),970-974], metals with plasma properties[Journal of the American...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06C02F1/30C02F101/30
CPCB01J23/06B01J35/004C02F1/30C02F2101/308C02F2305/10Y02W10/37
Inventor 张智平郑亚君行高选
Owner XI'AN PETROLEUM UNIVERSITY
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