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Ozonization water treatment method taking ZnAl2O4 nano particle as catalyst

A nanoparticle and ozonated water technology, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult separation, recycling and reuse, and achieve faster degradation rate, simple operation, The effect of easy access to raw materials

Active Publication Date: 2013-09-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In homogeneous catalytic ozonation, the catalyst is dispersed in the solution, which is difficult to separate and recycle, thus limiting its treatment of organic wastewater

Method used

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  • Ozonization water treatment method taking ZnAl2O4 nano particle as catalyst
  • Ozonization water treatment method taking ZnAl2O4 nano particle as catalyst
  • Ozonization water treatment method taking ZnAl2O4 nano particle as catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0020] Weigh 2.38g Zn(NO 3 ) 2 ·6H 2 O, 6.00g Al(NO 3 ) 3 9H 2 O and 9.60g of urea are dissolved in 160ml of water and ethanol mixture (V 水 / V 乙醇 =1), stir until dissolved. Transfer the resulting solution to a polytetrafluoroethylene-lined reactor, and keep it sealed at 200°C for 18 hours; after the reaction is completed, cool it down to room temperature naturally, wash the resulting precipitate with deionized water until it is neutral, and dry it at 90°C to obtain ZnAl 2 o 4 Nanoparticles. Its TEM picture is shown in figure 1 , XRD pattern see figure 2 .

Embodiment 2

[0022] The initial concentration of phenol in 200ml is 300mg L -1 In the simulated wastewater, adding ZnAl 2 o 4 0.20 g of nanoparticles was stirred, and ozone with an ozone flow rate of 0.75 mg / min was introduced at a reaction temperature of 25° C., and the concentration of phenol at different times was recorded. The results are as follows image 3 shown.

[0023] image 3 Middle (1) line is independent ozonation (no catalyst), (2) line is ZnAl in example 1 2 o 4 Nanoparticles catalyze ozonation. shows that under other conditions being equal, ZnAl 2 o 4 The addition of nanoparticles significantly promoted the degradation of phenol.

Embodiment 3

[0025] The initial concentration of phenol in 200ml is 300mg L -1 In the simulated wastewater, adding ZnAl 2 o 4 Add 0.20g of nanoparticles, add tert-butanol with a mass concentration of 10g / L, stir, and pass ozone with an ozone flow rate of 0.75mg / min at a reaction temperature of 25°C, and record the concentration of phenol at different times. The results are as follows Figure 4 shown.

[0026] Figure 4 Middle (1) line is independent ozonation (no catalyst), (2) line is ZnAl among the example 1 2 o 4 Nanoparticle catalyzed ozonation, (3) line is ZnAl in the example 1 under the presence of tert-butanol 2 o 4 Nanoparticles catalyze ozonation. It shows that under the same conditions, the addition of tert-butanol obviously inhibits the degradation of phenol.

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Abstract

The invention discloses an ozonization water treatment method taking a ZnAl2O4 nano particle as a catalyst, and provides a novel ozonization water treatment method on the basis that the ZnAl2O4 nano particle is prepared by a hydrothermal method and serves as the catalyst to be added to an ozonization water treatment system containing phenol-bearing wastewater, so as to facilitate degradation of phenol organic pollutants. The ozonization water treatment method belongs to the technical field of water treatment and environmental catalysis. The obtained ZnAl2O4 nano particle is small in scale, good in dispersity in an aqueous solution system, high in activity, and easy to separate and recover, and has wide application prospects in ozonization water treatment application.

Description

technical field [0001] The present invention proposes a ZnAl 2 o 4 The invention relates to an ozonation water treatment method in which nanoparticles are used as a catalyst, and belongs to the field of environmental catalysis and water treatment. Background technique [0002] At present, with the rapid development of industry and agriculture, the discharge of industrial wastewater and agricultural wastewater containing organic pollutants is increasing day by day. Many of these organic pollutants are highly toxic and difficult to be biodegraded, posing a serious threat to the ecological environment and human health. Therefore, the effective treatment of this type of organic wastewater has attracted widespread attention. Catalytic ozonation is an advanced oxidation process that uses catalysts to strengthen ozone oxidation at normal temperature and pressure. Studies have shown that the hydroxyl radicals produced during the catalytic reaction are very active, with an oxidati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/78B01J23/06
Inventor 董玉明赵辉蒋平平王光丽王佳俊
Owner JIANGNAN UNIV