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Preparation of magnetic photocatalyst for absorption and photocatalytic degradation of dye waste water

A manganese chloride and mixed oxide technology, which is used in catalyst activation/preparation, adsorbed water/sewage treatment, physical/chemical process catalysts, etc. Good adsorption and photocatalytic degradation, realizing industrialization and uniform particle size distribution

Inactive Publication Date: 2009-11-25
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the commonly used photocatalyst TiO 2 Only ultraviolet light activity, unable to make full use of sunlight and the shortcomings of suspension catalysts that are difficult to separate

Method used

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  • Preparation of magnetic photocatalyst for absorption and photocatalytic degradation of dye waste water
  • Preparation of magnetic photocatalyst for absorption and photocatalytic degradation of dye waste water
  • Preparation of magnetic photocatalyst for absorption and photocatalytic degradation of dye waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh a certain amount of lanthanum nitrate, ferric nitrate, manganese chloride and stearic acid respectively so that the molar ratio is 1:0.2:0.8:8. First, under the condition of constant temperature oil bath heating, dissolve stearic acid, under constant temperature magnetic stirring, dissolve lanthanum nitrate, ferric nitrate and manganese chloride solids in molten stearic acid, control the temperature at 115°C, and react for enough time to make it Become a stearic acid complex solution. Combust it at 500°C to obtain the precursor-mixed oxide, and its XRD diffraction pattern is shown in the attached Figure 2a . Take out the burned product and grind it into a muffle furnace, and calcinate it at 700°C for 1 hour to get LaFe 0.2 mn 0.8 o 3 Powder, its XRD diffraction pattern is shown in the attached Figure 2b .

Embodiment 2

[0028] Weigh a certain amount of lanthanum nitrate, ferric nitrate, manganese chloride, and stearic acid respectively so that the molar ratio is 1:0.4:0.6:7. First, under the condition of constant temperature oil bath heating, stearic acid is dissolved, and under constant temperature magnetic stirring, lanthanum nitrate, ferric nitrate, and manganese chloride solid are dissolved in molten stearic acid, and the temperature is controlled at 113°C, and the reaction time is sufficient to form Stearic acid complex solution, after it is burnt at 450 ℃, obtains precursor-mixed oxide, and its scanning electron microscope sees attached Figure 3a . Take out the burned product and grind it into a muffle furnace, and calcinate it at 650°C for 1 hour to get LaFe 0.4 mn 0.6 o 3 Powder, its scanning electron microscope SEM sees attached Figure 3b .

Embodiment 3

[0030] Weigh a certain amount of lanthanum nitrate, ferric nitrate, manganese chloride and stearic acid respectively so that the molar ratio is 1:0.6:0.4:8. First, under the condition of constant temperature oil bath heating, dissolve stearic acid, under constant temperature magnetic stirring, dissolve lanthanum nitrate, ferric nitrate and manganese chloride solids in molten stearic acid, control the temperature at 117°C, and react for enough time to make it Become a stearic acid complex solution. Combust it at 500°C to obtain the precursor-mixed oxide, which is LaOCl and La through XRD analysis 2 o 2 CO 3 And the mixture of amorphous powder. Take out the burned product and grind it into a muffle furnace, calcining it at 750°C for 1 hour to get the following Figure 4 LaFe shown 0.6 mn 0.4 o 3 Powder.

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Abstract

The invention relates to method for preparing superfine perovskite type LaFexMn(1-x)O3 (in which x is equal to 0.2 to 0.9 but not equal to 0.5) and precursor powder thereof by using stearic acid solution combustion method, comprising the following steps: lanthanum nitrate, ferric nitrate, manganese chloride and stearic acid with the mol ratio of 1: x: 1-x: 7 to 1: x: 1-x: 10 (in which x is equal to 0.2 to 0.9 but not equal to 0.5) are weighted, stearic acid is firstly melted, and then other reactants are added, the temperature is controlled between 110 DEG C and 117 DEG C, stearic acid complex solution is formed after reaction in enough time, the solution is disposed in a muffle furnace at the temperature of 300 to 500 DEG C, precursor-mixed oxide is obtained after combustion, and superfine perovskite type LaFexMn(1-x)O3 (in which x is equal to 0.2 to 0.9 but not equal to 0.5) powder is obtained after the precursor is calcined in the muffle furnace at the temperature of 600 to 800 DEG C for 1 to 2 hours. The obtained perovskite type oxide and precursor thereof are used for absorption and photocatalytic degradation of dye waste water such as helianthine, rhodamine B, alizarin red, and the like, both having good effects of absorption and photocatalytic degradation no matter in doors, under ultraviolet light or sunlight; and the catalyst is easy to recycle.

Description

technical field [0001] The invention relates to a perovskite type magnetic photocatalyst LaFe x mn 1-x o 3 (x=0.2-0.9) and its precursor preparation, and the use of these substances to adsorb and photocatalytically degrade dye wastewater. Background technique [0002] Dye sewage has the characteristics of large water volume, wide distribution, large water quality changes, high content of organic poisons, complex components, and refractory degradation. It has had a huge impact on aquatic ecosystems and their boundary environments, and its toxic events are increasingly exposed. At present, the methods for treating dye wastewater mainly include microwave catalytic oxidation, catalytic wet oxidation, electrochemical anodic oxidation, ultrasonic degradation, photocatalytic oxidation, electroflocculation, homogeneous and heterogeneous catalytic oxidation. [0003] Photocatalytic oxidation is a new water treatment technology developed in the past two decades. According to data ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/08B01J20/06C02F9/08C02F1/28C02F1/32C02F1/30C02F101/30
CPCY02W10/37
Inventor 卫芝贤雷青娟李延斌陈志萍王燕刘江邓焘王东张国光
Owner ZHONGBEI UNIV
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