Zinc ferrite-loaded carbon nano tube catalyst prepared by microwave-hydrothermal method and application of catalyst in degrading organic pollutants in water

A microwave hydrothermal method, a technology of organic pollutants, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of low bisphenol A concentration and high cost , difficult to degrade and other problems, to achieve the effect of enhanced absorbing performance, fast preparation speed and fast degradation speed

Active Publication Date: 2015-03-04
LIAONING UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, bisphenol A in water is often low in concentration and difficult to degrade. These methods cannot completely degrade pollutants fundamentally, often cause secondary pollution, and the cost is high, and the scope of application is limited.
The more popular chemical degradation method, photocatalytic degradation, usually requires a long time of light, and has the disadvantages of incomplete degradation.

Method used

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  • Zinc ferrite-loaded carbon nano tube catalyst prepared by microwave-hydrothermal method and application of catalyst in degrading organic pollutants in water
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  • Zinc ferrite-loaded carbon nano tube catalyst prepared by microwave-hydrothermal method and application of catalyst in degrading organic pollutants in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Zinc ferrite supported carbon nanotube catalyst

[0018] (1) Fe 3+ The effect of the concentration on the degradation rate

[0019] 1. Preparation method

[0020] Pretreatment of carbon nanotubes: adding carbon nanotubes (particle size 10-20nm) into nitric acid, boiling for 30min, cooling to room temperature, washing the suspension with deionized water to neutrality, filtering, and the obtained carbon nanotube particles in Dry in a constant temperature drying oven at 105°C for 5-7 hours, cool, grind, and pass through a 100-mesh sieve;

[0021] Preparation of zinc ferrite-supported carbon nanotube catalyst (ZnFe 2 o 4 / CNTs) Catalyst: Weigh FeCl respectively as in Table 1 3 Make Fe 3+ The concentration is 0.03~0.18mol / L, according to Fe 3+ with Zn 2+ The molar ratio is 2:1, weigh ZnCl 2 The solids were then dissolved together in 15.0 mL of deionized water to obtain a solution, and then 0.5 g of pretreated carbon nanotubes (CNTs, 10-20 nm) were added in...

Embodiment 2

[0049] Example 2 Application of Zinc Ferrite Supported Carbon Nanotube Catalyst in Degradation of Organic Pollutants

[0050] (1) Preparation of Zinc Ferrite Supported Carbon Nanotube Catalyst

[0051] Pretreatment of carbon nanotubes: adding carbon nanotubes (particle size 10-20nm) into nitric acid, boiling for 30min, cooling to room temperature, washing the suspension with deionized water to neutrality, filtering, and the obtained carbon nanotube particles in Dry in a constant temperature drying oven at 105°C for 5-7 hours, cool, grind, and pass through a 100-mesh sieve;

[0052] Preparation of zinc ferrite-supported carbon nanotube catalyst (ZnFe 2 o 4 / CNT s ) Catalyst: according to Fe in the mixed solution 3+ Concentration is 0.03mol / L, Fe 3+ with Zn 2+ The molar ratio of FeCl is 2:1, and FeCl 3 and ZnCl 2 Dissolve in 15.0 mL of deionized water, then add 0.5 g of pretreated carbon nanotubes (CNTs, 10-20 nm) into the mixture, and ultrasonicate for 1.0 min. Stir, a...

Embodiment 3

[0080] Example 3 Degradation of different organic pollutants by zinc ferrite-supported carbon nanotube catalysts

[0081] (1) Preparation of zinc ferrite supported carbon nanotube catalyst: same as Example 2

[0082] (2) Microwave degradation

[0083] Measure 25.0mL of 10.0mg / L solution containing different organic pollutants into the reactor, add 0.02g of zinc ferrite-supported carbon nanotube catalyst, put it in a microwave oven (750W) for 0-5.5min, cool to room temperature, filter, Its UV-vis spectrum was measured at 200-800 nm. Calculate the degradation rate. The results are shown in Table 10.

[0084] Table 10 ZnFe 2 o 4 Comparison of Degradation Performance of Different Organic Pollutants by / CNTs / MW

[0085]

[0086] Table 10 compares the degradation of five organic pollutants with different compositions and molecular structures in the system. It can be seen that ZnFe 2 o 4 In the / CNTs / MW system, the degradation rate of organic pollutants increased with the...

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Abstract

The invention relates to a zinc ferrite-loaded carbon nano tube catalyst prepared by a microwave-hydrothermal method and an application of the catalyst in degrading organic pollutants in water. A preparation method of the catalyst comprises the steps of dissolving FeCl3 and ZnCl2 into deionized water, adding a pretreated carbon nano tube into a solution, performing ultrasonic treatment for 1.0-3.0min, adjusting the pH to 7.5-11.5, stirring and transferring into a polytetrafluoroethylene reaction tank, putting the reaction tank into a microwave digester, performing hydrothermal reaction under the pressure of 0.3-1.5MPa for 10-40min, washing a product obtained by the reaction with the deionized water until the product is neutral, filtering the product, drying the product under the constant temperature of 70 DEG C, grinding the product, and screening the product with a screen of 100 meshes to obtain the zinc ferrite-loaded carbon nano tube catalyst. The catalyst provided by the invention is combined with microwaves to degrade the organic pollutants in water; the catalyst preparation speed is high, the degrading efficiency is high, the rate is high, and the cost is low; no intermediate product or secondary pollution is generated.

Description

technical field [0001] The invention belongs to the field of catalytic degradation, and in particular relates to a method for degrading organic pollutants by using magnetic zinc ferrite-loaded carbon nanotubes prepared by a microwave hydrothermal method as a catalyst and combining microwaves. Background technique [0002] Bisphenol A (BPA) is an important chemical raw material in industrial production. It is widely used in the field of life, such as the inner packaging of cans, food packaging, dental fillings and baby bottles and other plastic industries. However, because it can lead to the decline of the reproductive function of organisms, and can cause genetic effects such as three causes (mutagenesis, teratogenicity and carcinogenicity), its safety issues have received great attention. With the expansion of production and use, bisphenol A has become a global pollutant and is considered to be a representative environmental endocrine disruptor. In the process of production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C02F1/30
Inventor 张朝红王君张子默李媛媛郜炜宋立军乔珩
Owner LIAONING UNIVERSITY
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