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Lanthanum ferrite ozone catalyst for advanced treatment and preparation method thereof

An advanced treatment, lanthanum ferrite technology, applied in the field of water pollution control, can solve the problems of easy dissolution of metal ions and poor catalyst stability, and achieve the effect of good stability and high catalytic activity

Active Publication Date: 2019-09-27
北京北控工业环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects existing in the prior art, the object of the present invention is to provide a lanthanum ferrite ozone catalyst for advanced treatment and a preparation method thereof, and to use this iron-containing catalyst in the experimental research of catalytic ozone oxidation degradation of phenol , to improve the shortcomings of most catalysts such as poor stability and easy dissolution of metal ions, and to provide a feasible technical solution for the catalytic ozonation process to treat wastewater containing phenol and other organic substances in practical engineering applications

Method used

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  • Lanthanum ferrite ozone catalyst for advanced treatment and preparation method thereof
  • Lanthanum ferrite ozone catalyst for advanced treatment and preparation method thereof

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preparation example Construction

[0022] A preparation method for a lanthanum ferrite ozone catalyst for advanced treatment, comprising the following steps:

[0023] Step 101: La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O mixed solution was added dropwise to NaOH solution.

[0024] Preferably, La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 O solution concentration is the same, and the solution concentration range is 0.01-1mol / L.

[0025] Preferably, the concentration of the NaOH solution is 2-8mol / L.

[0026] It should be noted that La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 When the O mixed solution was added dropwise in the NaOH solution, the NaOH solution was in an excess state.

[0027] Step 102: Transfer the orange-yellow precipitate obtained in step (1) together with the mixed solution to a stainless steel autoclave, put it into a muffle furnace for calcination, cool down, and wash with distilled water until the pH is neutral.

[0028] Preferably, the calcination temperature is 100-500°C, and th...

Embodiment 1

[0037] By adding La(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 9H 2 The O mixed solution was added dropwise to the NaOH solution, and the resulting orange precipitate was transferred together with the mixed solution into a stainless steel autoclave, and the autoclave was put into a muffle furnace for calcination at 180 °C for 24 h. Then it was taken out from the muffle furnace, cooled naturally to room temperature, the precipitate was taken out, washed with distilled water until the pH was neutral, and then transferred to an oven at 60°C for 24 hours to obtain LaFeO 3 , take 0.25g of the prepared catalyst to add phenol-containing wastewater to construct LaFeO 3 / O 3 system, when the reaction occurs for 30 minutes, take a sample to measure phenol and CODCr Removal efficiency, wherein the removal efficiency of phenol is 48.9%±1.2%, COD Cr The removal efficiency was 62.8%±6.0%.

Embodiment 2

[0039] Prepare LaFeO as described in Example 1 3 Catalyst, take 0.5g prepared catalyst and add phenol-containing wastewater to construct LaFeO 3 / O 3 system, when the reaction occurs for 30 minutes, take a sample to measure phenol and COD Cr Removal efficiency, wherein the removal efficiency of phenol is 77.1%±0.5%, COD Cr The removal efficiency was 78.8%±5.3%.

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Abstract

The invention provides a lanthanum ferrite ozone catalyst for advanced treatment and a preparation method thereof. The method includes the steps of dropwise adding a mixed solution of La(NO3)3 6H2O and Fe(NO3)3 9H2O with an equal amount of substance to a NaOH solution; transferring orange yellow precipitate and a mixture solution which are obtained in step (1) together into a stainless steel autoclave, placing the stainless steel autoclave in a muffle furnace for calcination, conducting cooling, and conducting washing with distilled water until the pH is neutral; placing the material prepared in step (2) in an oven to be dried to obtain a lanthanum ferrite catalyst, wherein the lanthanum ferrite catalyst is recorded as LaFeO3. According to the lanthanum ferrite ozone catalyst for deep treatment and the preparation method thereof, defects such as a complicated existing catalyst preparation process and poor performance and stability of existing catalyst materials are overcome, the lanthanum ferrite ozone catalyst has good stability and high catalytic activity, and a feasible technical scheme is provided for application of a catalytic ozone oxidation process for treatment of wastewater containing organic pollutants such as phenol in practical engineering.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a lanthanum ferrite ozone catalyst for advanced treatment and a preparation method thereof. Background technique [0002] Phenol is a common chemical and an important raw material in industry. It is widely used in the synthesis of resins, pesticides, preservatives and drugs. Due to long-term and large-scale production and use, many lakes, farmland and groundwater have been polluted to varying degrees, posing a threat to the water environment and human health. Because phenol is biodegradable, through the action of the food chain, it will eventually enter the human body for enrichment, and then cause a series of diseases, such as hemoglobinemia, anemia, etc.; in addition, phenol can also damage the functions of human spleen, liver, and kidney , or directly damage the nervous system and immune system. Therefore, it is necessary to develop a stable and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/78C02F101/34
CPCB01J23/83C02F1/78C02F2101/345Y02W10/10
Inventor 刘洋陈男冯传平李平邢林林王志国高放余迎春
Owner 北京北控工业环境科技有限公司