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Modified Fenton-like catalyst and preparation method and application thereof

A catalyst and modification technology, applied in the field of modified Fenton-like catalysts and preparation, can solve the problems of complex and discontinuous application process, low catalytic degradation rate, loss of active components, etc., and achieve high hydrogen peroxide utilization, strong Tolerance and stability, long life effect

Active Publication Date: 2020-07-17
WANHUA CHEM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problems to be solved by the present invention are: the existing Fenton-like catalysts have low catalytic degradation rate, serious loss of active components, complex and discontinuous application process, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Add 500 mL of deionized water and 16.45 g of Co(NO 3 ) 2 ·6H 2 O and 21.21g of Al(NO 3 ) 3 9H 2 O, stirring speed 150r / min, stirring for 4h to make it completely dissolved, slowly dropwise adding ammonia water to the solution to adjust the pH of the solution to 8.0, and obtain a solid precipitate after filtration, place it in a drying oven at 120°C for 6h, and then 10.02g of nano-cobalt aluminate was obtained after roasting at 1200°C for 3 hours in a Furnace;

[0033] (2) Add the obtained nano-cobalt aluminate, 85.86g of titanium dioxide (purity: 99wt%), and 11.18g of nitric acid solution (purity: 30wt%) into 107mL of deionized water in sequence, stirring at a speed of 300r / min, and stirring for 6h Mix well afterwards. The mixture is extruded in an extruder, dried in a drying oven at 120°C for 6 hours, and then roasted in a muffle furnace at 500°C for 6 hours to obtain a shaped carrier;

[0034] (3) 12.65g of Fe(NO 3 ) 3 9H 2 O was dissolved in deionized w...

Embodiment 2

[0037] (1) Add 20 mL of deionized water and 1.65 g of Co(NO 3 ) 2 ·6H 2 O and 2.12g of Al(NO 3 ) 3 9H 2 O, stirring speed 100r / min, stirring for 2h to make it completely dissolved, slowly dropwise adding ammonia water to the solution to adjust the pH of the solution to 10.0, and obtain a solid precipitate after filtration, place it in a drying oven at 80°C for 2h, and then 0.99g of nano-cobalt aluminate was obtained after calcination at 800°C for 2 hours in a Furnace;

[0038] (2) The obtained nano-cobalt aluminate and 98.99g of titanium dioxide (purity 99wt%), 11.67g of nitric acid solution (purity 30wt%) were added to 111.66mL of deionized water successively, stirring speed 200r / min, stirring Mix well after 4h. The mixture is extruded in an extruder, dried in a drying oven at 80°C for 2 hours, and then roasted in a muffle furnace at 200°C for 2 hours to obtain a shaped carrier;

[0039] (3) 2.53g of Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water to make a 45mL...

Embodiment 3

[0042] (1) Add 350 mL of deionized water and 24.68 g of Co(NO 3 ) 2 ·6H 2 O and 31.81g of Al(NO 3 ) 3 9H 2 O, the stirring speed is 200r / min, stir for 4h to make it completely dissolved, slowly add ammonia water dropwise to the solution to adjust the pH of the solution to 6.0, obtain a solid precipitate after filtration, place it in a drying oven at 120°C for 8h, and then 15.06g of nano-cobalt aluminate was obtained after calcination at 1200°C for 4 hours in a Furnace;

[0043] (2) The obtained nano-cobalt aluminate and 75.76g of titanium dioxide (purity 99wt%), 10.59g of nitric acid solution (purity 30wt%) were added to 101.35mL of deionized water successively, stirring speed 400r / min, stirring Mix well after 8h. The mixture is extruded in an extruder, dried in a drying oven at 120°C for 8 hours, and then roasted in a muffle furnace at 400°C for 6 hours to obtain a shaped carrier;

[0044] (3) 25.30g of Fe(NO 3 ) 3 9H 2 O was dissolved in deionized water to prepare ...

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Abstract

The invention discloses a modified Fenton-like catalyst for catalytic oxidation of organic wastewater by a fixed bed and a preparation method and application of the modified Fenton-like catalyst. According to the catalyst, titanium oxide is used as a carrier, iron oxide is used as an active component, and cobalt-aluminum oxide (cobalt aluminate) is used for modifying the carrier, so that the stability and the activity of the catalyst under an acidic condition are enhanced. The invention discloses a preparation method of the catalyst, which comprises the following steps: by using a cobalt saltand an aluminum salt as raw materials, preparing precipitates by using a precipitator, carrying out filtering, washing, drying, calcining and the like to obtain nano cobalt aluminate, mixing the nanocobalt aluminate with titanium dioxide, molding, drying, roasting to obtain a carrier, and preparing the catalyst by using an impregnation method. According to the catalyst disclosed by the invention,cobalt aluminate with a spinel structure can be used for modifying the catalyst, so that the stability of the catalyst in an acidic medium is enhanced, therefore, the activity of the catalyst and theutilization rate of hydrogen peroxide are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of Fenton-like catalysts, and in particular relates to a modified Fenton-like catalyst for catalytic oxidation of organic waste water in a fixed bed, a preparation method and application thereof. Background technique [0002] Due to the different pollutants and pollution levels of industrial wastewater, the biodegradability of industrial wastewater varies greatly. At present, most industrial wastewater is difficult to meet the discharge standard after biochemical treatment. It is necessary to add advanced treatment units for reprocessing to achieve discharge. Standard, advanced wastewater treatment technologies that have been developed include ozone oxidation, activated carbon adsorption, membrane separation, wet oxidation, and Fenton oxidation, among which Fenton oxidation (H 2 o 2 / Fe 2+ ) is considered to be an effective, simple and economical treatment method, while other methods are difficult to be ac...

Claims

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Application Information

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IPC IPC(8): B01J23/75C02F1/72C02F101/34
CPCB01J23/75C02F1/722C02F2101/345Y02W10/10
Inventor 魏立彬周波衡华李源张宏科
Owner WANHUA CHEM GRP
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