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Method for catalytic degradation of high-concentrated organic wastewater by micro-wave cooperating with perovskite

A technology for organic wastewater and catalytic degradation, applied in the field of water treatment, to achieve the effects of wide application range, easy operation, good oxygen storage capacity and oxygen transfer capacity

Inactive Publication Date: 2013-02-13
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, domestic and foreign literature and patents have not reported the use of cerium-doped perovskite oxides as catalysts to degrade organic wastewater with the assistance of microwaves.

Method used

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  • Method for catalytic degradation of high-concentrated organic wastewater by micro-wave cooperating with perovskite
  • Method for catalytic degradation of high-concentrated organic wastewater by micro-wave cooperating with perovskite
  • Method for catalytic degradation of high-concentrated organic wastewater by micro-wave cooperating with perovskite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First La(NO 3 ) 3 and Fe(NO 3 ) 3 Prepare a mixed aqueous solution with a ratio (molar ratio) of 1.0:1.0, control the total concentration of all metal ions in the solution to be 0.5~1.5 mol / L, and then press citric acid and metal ions (La 3+ + Fe 3+ ) with a molar ratio of 1.0:1.0, add citric acid, mix and stir the solution at 80°C, evaporate to 1 / 3 of the volume of the original solution, put it in an oven and dry and dehydrate at 120-130°C to form Loose dry gel. Then continue to raise the temperature of the oven to 140-180°C to cause the violent decomposition of the metal nitrate to obtain the catalyst precursor. Finally, the catalyst precursor was calcined at 800 °C for 4 hours to obtain LaFeO 3 Perovskite-type metal composite oxide catalyst.

[0026] This catalyst was applied to the treatment of methyl orange simulated printing and dyeing wastewater. Measure 25 mL of methyl orange solution with a concentration of 50 mg / L and place it in the reactor, add 0.1 ...

Embodiment 2

[0028] Ce(NO 3 ) 2 , La(NO 3 ) 3 and Fe(NO 3 ) 3 The molar ratio is 0.2:0.8:1.0 preparation mixed solution, other conditions are identical with embodiment 1, prepare La 0.8 Ce 0.2 FeO 3 Perovskite-type metal composite oxide catalyst, its scanning electron microscope photo is as follows figure 1 shown.

[0029] This catalyst was applied to the treatment of methyl orange simulated printing and dyeing wastewater. Such as figure 2 As shown, the degradation of methyl orange by microwave irradiation alone is very limited, adding 0.2g La to the system 0.8 Ce 0.2 FeO 3 After the catalyst was irradiated for 9 minutes under the same microwave power of 540W, the removal rate of methyl orange could reach 94.1%. Depend on image 3 It can be seen that the simulated wastewater has been basically decolorized after degradation.

Embodiment 3

[0031] The catalyst prepared in Example 2 was used to treat methyl orange simulated printing and dyeing wastewater. Using the same experimental method as in Example 2, changing the amount of the catalyst, and investigating the degradation performance of the simulated wastewater. Such as Figure 4 As shown, the dosage is as Figure 4 As shown in , with the increase of catalyst dosage, the removal rate of methyl orange gradually increased. When the amount of catalyst is 0.2g, the removal rate of methyl orange can reach 93.3%.

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Abstract

The invention provides a method for catalytic degradation of high-concentrated organic wastewater by micro-wave cooperating with perovskite. Cerium-doped La1-xCexBO3 perovskite prepared by the citric acid complexation method is adopted as a catalyst, wherein B is Fe, Co or Ni, and doping content of Ce is x which is from 0.1 to 0.9. The perovskite catalyst is added into organic wastewater, and additive amount of the perovskite is from 2.0g / L to 8.0g / L. Irradiation time is from 2 minutes to 10 minutes under the condition that a micro-wave power is from 200 to 700 watts. Rate of removal of the organic wastewater is calculated according to an absorbance. Aeration can be kept or air is continuously inflated in a catalytic degradation reaction and by means of oxygen transfer of the perovskite catalyst, a continuous reaction can be achieved. Various reactive oxygen species are generated in situ on the catalyst surface by using self oxygen storage performance and oxygen transfer performance of perovskite oxide instead of adding oxidants such as H2O2, and then degradation of organics can be achieved under the micro-wave cooperation effect.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a treatment method for refractory organic waste water, in particular to a method for catalytically degrading high-concentration organic waste water by microwave and perovskite. Background technique [0002] Wastewater produced in chemical, printing and dyeing, pharmaceutical, paper and other industries contains various organic pollutants. These organic substances have the characteristics of strong chemical stability, high toxicity, and difficulty in biodegradation. There are still certain limitations in the treatment of them by traditional oxidation technology. sex. However, if the above-mentioned organic wastewater cannot be effectively controlled and treated, it will inevitably pose a serious threat to human health and the ecosystem of nature. [0003] At present, the combination of physicochemical and biochemical processes is mainly used to treat various industrial wast...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/32B01J23/83
Inventor 徐东彦戴萍万家齐卢启增
Owner QINGDAO UNIV OF SCI & TECH
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