Method for preparing high-porosity ozone oxidation nbsCOD catalyst from fenton iron sludge

An ozone oxidation, high porosity technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low porosity and low catalytic performance, etc. Achieve the effect of increasing porosity, increasing contact area, and enhancing catalytic degradation ability

Inactive Publication Date: 2018-11-23
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of method that utilizes Fenton's iron slime to prepare high-porosity ozone oxidation nbsCOD catalyst, aims to solve existing molding method when being used for Fenton's iron slime to prepare ozone oxidation nbsCOD catalyst, exists porosity relatively low, low catalytic performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add ammonia water to the Fenton iron mud to adjust the pH to 6-10, ultrasonic at 60°C for 10-20min, filter off the supernatant, wash repeatedly with distilled water and absolute ethanol for 2-3 times, and then put it in a drying oven to dry Dry and grind finely in a ball mill. Weigh 100 kg of finely ground Fenton iron slime and 500 kg of activated alumina powder into a container, add 2 wt% pore-forming agent, add appropriate amount of water and stir to mix. Then the mixed material is put into an extruding rod-making machine, extruded and pelletized to obtain cylindrical pellets with an aspect ratio of 0.85. The cylindrical particles were placed in a ball forming disc with a rotating speed of 40 r / min to form a ball to prepare a catalyst preform. The catalyst prefabricated body was put into a muffle furnace and calcined at 450 °C for 2 h to obtain the catalyst, and the catalyst for ozone oxidation of nbsCOD was obtained, with a density of 0.84 g / cm 3 , the porosity is ...

Embodiment 2

[0025] Add ammonia water to the Fenton iron mud to adjust the pH to 6-10, ultrasonic at 60°C for 10-20min, filter off the supernatant, wash repeatedly with distilled water and absolute ethanol for 2-3 times, and then put it in a drying oven to dry Dry and grind finely in a ball mill. Weigh 200 kg of finely ground Fenton's iron slime and 500 kg of activated alumina powder into a container, add 6 wt% pore-forming agent, and add an appropriate amount of water to stir and mix well. Then the mixed material is put into an extruding rod-making machine, extruded and pelletized to obtain cylindrical pellets with an aspect ratio of 0.95. The cylindrical particles were placed in a ball-forming plate with a rotating speed of 45 r / min to form a ball to prepare a catalyst preform. The catalyst preform was put into a muffle furnace and calcined at 500 °C for 3 h to obtain the catalyst, and the catalyst for ozone oxidation of nbsCOD was obtained, with a density of 0.87 g / cm 3 , the porosity...

Embodiment 3

[0027] Add ammonia water to the Fenton iron mud to adjust the pH to 6-10, ultrasonic at 60°C for 10-20min, filter off the supernatant, wash repeatedly with distilled water and absolute ethanol for 2-3 times, and then put it in a drying oven to dry Dry and grind finely in a ball mill. Weigh 300 kg of finely ground Fenton's iron slime and 500 kg of activated alumina powder into a container, add 10 wt% pore-forming agent, and add an appropriate amount of water to stir and mix well. Then the mixed material is put into an extruding rod-making machine, extruded and pelletized to obtain cylindrical pellets with an aspect ratio of 1.00. The cylindrical particles were placed in a ball-forming plate with a rotating speed of 50 r / min to form balls to prepare catalyst preforms. The catalyst preform was put into a muffle furnace and calcined at 550 °C for 4 h to obtain the catalyst, and the catalyst for ozone oxidation of nbsCOD was obtained, with a density of 0.92 g / cm 3 , the porosity ...

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Abstract

The invention relates to a method for preparing a high-porosity ozone oxidation nbsCOD catalyst from fenton iron sludge. According to the method, treated fenton iron sludge and aluminum oxide are utilized as main raw materials, the defined amount of pore forming agent is added to be evenly stirred and mixed with water, an extruding and rounding method is utilized, the mixed materials are put intoan extruding rod machine, and cylindrical particles with a length to diameter ratio as 0.85 to 1.00 can be obtained by extruding and cutting into particles; the cylindrical particles are put into a balling disk of a centrifuging rounding machine to be formed into balls under the rotation speed of 40 to 50r/min, the balls are dried and put into a chamber type electric resistance furnace to be roasted under 450 to 550 DEG C, thermal insulation is performed for 2 to 4 h, and the high-porosity ozone oxidation nbsCOD catalyst is achieved. The density of the high-porosity ozone oxidation nbsCOD catalyst prepared by the method disclosed by the invention is 0.70 to 1.00 g/cm<3>, the porosity is 65 to 82%, the water absorption is 55 to 75%, and the compressive strength is higher than 80N. The catalyst prepared by the method disclosed by the invention effectively improves capacity of ozone to degrade nbsCOD.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a high-porosity ozone oxidation nbsCOD catalyst by using Fenton's iron slime. Background technique [0002] Ozone is a green and environmentally friendly clean energy with strong oxidizing ability and can effectively remove soluble and refractory organic pollutants (nbsCOD). Ozone catalytic oxidation is an advanced oxidation technology developed on the basis of ozone oxidation for advanced sewage treatment. Compared with ozone oxidation alone, ozone catalytic oxidation generates hydroxyl radicals with stronger oxidation ability due to the use of catalysts. , the reaction rate is fast, the selectivity is small, and the decomposition of organic matter is more thorough, and it is widely used in actual sewage treatment. [0003] The catalyst can effectively improve the efficiency of ozone catalytic oxidation to degrade organic matter a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/08C02F1/78
CPCB01J23/002B01J23/745B01J37/0018C02F1/725C02F1/78
Inventor 杜庆洋于华芹熊春月贲韬徐会君刘颖宁慧昊李宾祥
Owner SHANDONG UNIV OF TECH
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