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Preparation method of nano Fe3O4/CeO2 composite material and application thereof

A composite material, fe3o4 technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution, increase of COD, and large amount of reagents, etc., to achieve no The effect of secondary pollution, low equipment requirements, and thorough secondary pollution

Inactive Publication Date: 2013-06-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional Fenton reagent method still has many deficiencies in practical applications, such as the long time required to treat wastewater, the large amount of reagents used, the H 2 o 2 Utilization still needs to be improved, and excess Fe 2+ Will increase the COD in the treated wastewater and produce secondary pollution

Method used

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  • Preparation method of nano Fe3O4/CeO2 composite material and application thereof
  • Preparation method of nano Fe3O4/CeO2 composite material and application thereof
  • Preparation method of nano Fe3O4/CeO2 composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of Nano-CeO by Liquid Phase Precipitation 2 Particles, the steps are as follows: the concentration of 0.1mol / L (NH 4 ) 2 CO 3 ·H 2 O was quickly added as a precipitant to Ce(NO 3 ) 3 ·6H 2 O solution, (NH 4 ) 2 CO 3 ·H 2 O solution and Ce(NO 3 ) 3 ·6H 2 The volume ratio of the O solution is 3:2, and the surfactant polyethylene glycol 4000 (PEG 4000) of 4g / L is added at the same time, the reaction time is 10min, the reaction temperature is 40°C, stirring, and the reaction generates a precursor; the precursor sol After filtering, wash twice with deionized water to remove impurities, put the filtered precursor into a beaker filled with absolute ethanol, and disperse it with ultrasonic waves for 10 minutes; then filter, vacuum dry, and then bake in air at 300 °C 1h, get nano-CeO 2 particles.

[0030] Then nano-CeO 2 The particles are used as the carrier, and the Massart hydrolysis method in the co-precipitation method is used to prepare nano-Fe ...

Embodiment 2

[0037] Preparation of Nano-CeO by Liquid Phase Precipitation 2 Particles, the steps are as follows: the concentration of 0.1mol / L (NH 4 ) 2 CO 3 ·H 2 O was quickly added as a precipitant to Ce(NO at a concentration of 0.2mol / L 3 ) 3 ·6H 2 O solution, (NH 4 ) 2 CO 3 ·H 2 O solution and Ce(NO 3 ) 3 ·6H 2The volume ratio of the O solution is 3:1, and 4g / L surfactant polyethylene glycol 4000 (PEG 4000) is added at the same time, the reaction time is 20min, the reaction temperature is 60°C, stirring, and the reaction generates a precursor; the precursor sol After filtering, wash twice with deionized water to remove impurities, put the filtered precursor into a beaker filled with absolute ethanol, and disperse it with ultrasonic waves for 10 minutes; then filter, vacuum dry, and then bake in air at 300 °C 1h, get nano-CeO 2 particles.

[0038] Then nano-CeO 2 The particles are used as the carrier, and the Massart hydrolysis method in the co-precipitation method is us...

Embodiment 3

[0045] Nano Fe 3 o 4 / CeO 2 The preparation process of the composite material is the same as in Example 1.

[0046] Experiments compared the addition of nano-Fe alone 3 o 4 / CeO 2 , add H alone 2 o 2 , Nano CeO 2 and H 2 o 2 Combined use, nano-Fe 3 o 4 and H 2 o 2 Combined use, nano-Fe 3 o 4 / CeO 2 and H 2 o 2 The difference in the removal rate of 4-chlorophenol under the combination of five processes.

[0047] Add nano-Fe separately 3 o 4 / CeO 2 In the experiment, the Erlenmeyer flask was used as the reactor, and the treatment conditions were 4-chlorophenol-containing wastewater with a concentration of 100mg / L, pH 3.0, and the addition of 2.0g / L nano-Fe 3 o 4 / CeO 2 , the reactor was placed in a water bath shaker with a rotation speed of 150 rpm and a temperature of 30 °C.

[0048] Add H alone 2 o 2 In the experiment, 30mM H was added to the reactor 2 o 2 , and the other conditions are the same as above.

[0049] nano-CeO 2 and H 2 o 2 In the ...

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Abstract

The invention discloses a preparation method of a nano Fe3O4 / CeO2 composite material and application thereof, belonging to the technical field of material preparation and environment. In the preparation method, with nano CeO2 particles as a carrier, the nano Fe3O4 / CeO2 composite material is synthesized by adopting a coprecipitation method; and in the application method, the nano Fe3O4 / CeO2 composite material is used as a Fenton-like catalyst and reacts with chlorophenol waste water under the coexistence of Fe3O4 / CeO2 and H2O2 to degrade chlorophenol organic matters in waste water. The nano Fe3O4 / CeO2 composite material disclosed by the invention has the advantages of simple synthesis process, low equipment requirement and low cost; the catalyst has magnetism, is easy to recover and can berecycled; and a heterogeneous Fenton-like method is highly-efficient, rapid, economic and feasible and has no secondary pollution when used for treating the chlorophenol waste water, thereby having wide application prospect.

Description

technical field [0001] The invention belongs to the field of material preparation and environmental technology, in particular to a nano-Fe 3 o 4 / CeO 2 Preparation methods and applications of composite materials. Background technique [0002] Chlorophenols are widely used in the production of wood preservatives, rust inhibitors, fungicides, herbicides and pesticides, and are also by-products of waste incineration and dechlorination of drinking water. The extensive use of chlorophenols has caused a large amount of chlorophenols organic pollutants to enter the environment. Because these pollutants are highly toxic, difficult to degrade and easy to accumulate, and have "three effects", they pose a serious threat to ecosystems and human health. Therefore, the removal of chlorophenol pollutants in the environment is one of the problems to be solved urgently. [0003] At present, there are many treatment methods such as physical chemistry, biology and heat to control such pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C02F1/72C02F101/36
Inventor 王建龙徐乐瑾
Owner TSINGHUA UNIV
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