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Method for processing explosive wastewater

A technology for pyrotechnics and wastewater, which is applied in the field of pyrotechnics wastewater treatment, can solve the problems of inability to make full use of sunlight and the difficulty of separating suspended catalysts, and achieve good adsorption and photocatalytic degradation, small particle size distribution, and high saturation magnetic properties Effect

Inactive Publication Date: 2013-07-24
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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  • Method for processing explosive wastewater
  • Method for processing explosive wastewater
  • Method for processing explosive wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021]Weigh a certain amount of lanthanum nitrate, cerium nitrate, manganese chloride, ferric nitrate and stearic acid respectively so that the molar ratio is 0.9:0.1:0.1:0.9:8. First, under the condition of constant temperature oil bath heating, stearic acid is melted, and under constant temperature magnetic stirring, lanthanum nitrate, cerium nitrate, manganese chloride, iron nitrate solids are melted into molten stearic acid, and the temperature is controlled at 123°C, and the reaction is sufficient Time to make it a stearic acid complex solution. Burn it at 500°C to obtain the precursor-mixed oxide, take out the burned product and grind it and put it in a muffle furnace, and calcinate it at 700°C for 2 hours to obtain La 0.9 Ce 0.1 mn 0.1 Fe 0.9 o 3-d powder, see the attached magnetic curve figure 1 .

Embodiment 2

[0023] Weigh a certain amount of lanthanum nitrate, cerium nitrate, manganese chloride, ferric nitrate and stearic acid respectively so that the molar ratio is 0.8:0.2:0.1:0.9:9. First, melt the stearic acid under constant temperature oil bath heating condition, and dissolve lanthanum nitrate, ferric nitrate, and manganese chloride solids in the molten stearic acid under constant temperature magnetic stirring, control the temperature at 121°C, and react for enough time to make it Become a stearic acid complex solution. Combust it at 500°C to obtain a mixed oxide, take out the burned product, grind it and put it in a muffle furnace, and calcinate it at 750°C for 2 hours to obtain La 0.8 Ce 0.2 mn 0.1 Fe 0.9 o 3-d Powder, its XRD diffraction pattern and UV-Vis diffuse reflectance curve are shown in the attached figure 2 And attached image 3 .

Embodiment 3

[0025] Weigh a certain amount of lanthanum nitrate, cerium nitrate, manganese chloride, ferric nitrate and stearic acid respectively so that the molar ratio is 0.7:0.3:0.1:0.9:10. First, melt stearic acid under constant temperature oil bath heating conditions, and dissolve lanthanum nitrate, ferric nitrate, cobalt nitrate, and manganese chloride solids in molten stearic acid under constant temperature magnetic stirring, and control the temperature at 124°C. The reaction is sufficient Time to make it a stearic acid complex solution. Make it burn at 500°C, take out the burned product, grind it and put it in a muffle furnace, and calcinate it at 750°C for 1 hour to get La 0.7 Ce 0.3 mn 0.1 Fe 0.9 o 3-d Powder.

[0026] (2) Examples of adsorption and photocatalytic degradation of pyrotechnic waste water

[0027] Example 1

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Abstract

The invention relates to a method for preparing ultrafine perovskite type La1-xCexMn0.1Fe0.9O3-d (x=0.1-0.3) by a stearic acid solution combustion method. The method comprises the following steps: weighting lanthanum nitrate, cerium nitrate, manganese chloride, ferric nitrate and stearic acid according to mole ratio of 1-x: x: 0.1: 0.9: (7-10)(x=0.1-0.3), under the condition of oil bath heating, melting stearic acid, performing magnetic stirring at constant temperature, melting cerium nitrate, manganese chloride and a ferric nitrate solid in molten stearic acid, controlling the temperature of 120-125 DEG C, reacting for more than 6 hours to generate a stearic acid solution, placing in a muffle furnace at the temperature of about 300-500 DEG C, heating for combusting to obtain a precursor mixed oxide, then calcining in the muffle furnace at the temperature of 700-800 DEG C to obtain the perovskite type La1-xCexMn0.1Fe0.9O3-d (x=0.1-0.3) ultrafine powder, adding the obtained perovskite type catalyst La1-xCexMn0.1Fe0.9O3-d (x=0.1-0.3) in 10-150 mg / L of TNT model explosive waste water, adjusting the pH value of waste water to 3-5, stirring at room temperature and adsorbing for 1-30 minutes, and then irradiating for 0-2 hours under ultraviolet light and sunlight.

Description

technical field [0001] The present invention relates to perovskite type magnetic photocatalyst La 1-χ Ce χ mn 0.1 Fe 0.9 o 3-d (χ = 0.1-0.3), and the use of these substances to adsorb and photocatalytically degrade explosives TNT waste water. Background technique [0002] TNT (TNT) is one of the most widely used high-energy explosives in the world. It is highly carcinogenic and can induce mutations in the body. It is classified as the first class of environmentally hazardous substances by the US Environmental Protection Agency (EPA), and the allowed emission concentration is 0.32mg. ·L -1 , if discharged into the environment, will seriously threaten human health and survival. The treatment technologies for pyrotechnics and explosives wastewater at home and abroad mainly include incineration, composting, chemical oxidation, activated carbon adsorption and biological treatment, Fenton reagent method, etc. [0003] Photocatalytic oxidation is a new water treatment techno...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/32C02F1/28C02F1/72B01J20/02B01J23/889
CPCY02W10/37
Inventor 卫芝贤李延斌王艳曾伟伟肖彩梅叶少博
Owner ZHONGBEI UNIV
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