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Aluminium-oxide-supported iron oxides catalyst, preparation method and application thereof to organic wastewater processing

An alumina-loaded, iron-oxide technology, applied in the oxidation water/sewage treatment and other directions, can solve the problems of weak catalyst loading, weak pre-concentration ability of pollutants, serious catalyst agglomeration, etc. The effect of high ozone utilization rate and fast reaction rate

Inactive Publication Date: 2016-02-03
建德市环保科技创新创业中心有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the heterogeneous catalytic ozonation technology also has certain problems: (1) the catalyst is not firmly loaded on the carrier; (2) the agglomeration of the catalyst on the carrier is relatively serious; (3) the pre-enrichment of pollutants by the carrier Not strong

Method used

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  • Aluminium-oxide-supported iron oxides catalyst, preparation method and application thereof to organic wastewater processing
  • Aluminium-oxide-supported iron oxides catalyst, preparation method and application thereof to organic wastewater processing
  • Aluminium-oxide-supported iron oxides catalyst, preparation method and application thereof to organic wastewater processing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The first step, carrier modification: take commercial γ-Al with a particle size of 1-3mm 2 o 3 (Pingxiang Xintao Alumina Plant, γ-Al 2 o 3 Porosity: 0.75) particles 100g, washed with tap water, dried at 120°C. Under the working pressure of 25Pa and the RF power of 200W, Ar+O 2 Plasma treatment of activated alumina particles for 3 min.

[0044] The second step, impregnation: impregnate the above-mentioned modified alumina particles in 112.5mL ferric nitrate solution with a mass fraction of 1%, shake in a shaker at 100r / min for 12h, and then put the container into Suspension steaming in a suspension steamer at 60° C. for 12 hours to obtain particles loaded with ferric nitrate.

[0045] The third step, roasting: put the dry alumina particles loaded with ferric nitrate in a box furnace, and roast at 585°C for 2h to obtain the catalyst-iron-loaded activated alumina (FeO x / Al 2 o 3 , x=0-1.5).

[0046] The pore size, specific surface area, dispersion, and contact an...

Embodiment 2

[0052] The first step, carrier modification: take commercial γ-Al with a particle size of 3-5mm 2 o 3 (Pingxiang Xintao Alumina Plant, γ-Al 2 o 3 Porosity: 0.78) Granules 3kg, washed with tap water, dried at 120°C. Under the working pressure of 25Pa and the RF power of 200W, use N 2 Plasma treatment of activated alumina particles for 3 min.

[0053] The second step, impregnation: impregnate the above-mentioned modified alumina particles in 2.808L of a 2% mass fraction of ferric nitrate and ferric chloride mixed in a solution of 1:3, in a stirring tank at 500r / min The mixture was stirred for 12 hours, and then the alumina particles were dried in an oven at 100° C. for 4 hours to obtain particles loaded with ferric nitrate and ferric chloride.

[0054] The third step, roasting: put the dry particles loaded with ferric nitrate and ferric chloride in a well-type furnace, and roast at 526 ° C for 1.3 h to obtain the catalyst-iron-loaded activated alumina (FeO x / Al 2 o 3 x=...

Embodiment 3

[0061] The first step, carrier modification: take commercial γ-Al with a particle size of 1-3mm 2 o 3 (Pingxiang Xintao Alumina Plant, γ-Al 2 o 3 Porosity: 0.75) Granules 500kg, washed with tap water, dried at 120°C. Under the working pressure of 25Pa and the RF power of 50W, Ar 2 +O 2 Plasma treatment of activated alumina particles for 4min.

[0062] The second step, impregnation: impregnate the above-mentioned modified alumina particles in 562.5L ferric nitrate, ferric chloride, ferrous nitrate, and ferrous chloride with a mass concentration of 6% according to the ratio of 1:2:3:1 In the mixed solution mixed in proportion, stir and mix in a stirring tank for 12 hours, and then put the iron-loaded alumina particles in an oven at 95° C. for 6 hours.

[0063] The third step, roasting: put the dried alumina particles loaded with a mixture of ferric nitrate, ferric sulfate, ferrous nitrate and ferrous sulfate in a converter, and roast at 465°C for 2.5h to obtain the catalys...

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Abstract

The invention discloses a preparation method for an aluminium-oxide-supported iron oxides catalyst, and application of the catalyst to organic wastewater processing. The preparation method comprises the following steps: (1) firstly cleaning an aluminium oxide particle with clean water, and then modifying the aluminium oxide particle by using a low-pressure plasma, so as to obtain modified aluminium oxide; (2) fully dipping the modified aluminium oxide obtained in the step (1) in an iron salt solution, and then drying, so as to obtain iron-loaded aluminium oxide; and (3) calcining the iron-loaded aluminium oxide obtained in the step (2), so as to obtain the aluminium-oxide-supported iron oxides catalyst after calcining is finished. The aluminium-oxide-supported iron oxides catalys obtained by employing the preparation method possesses the advantages of being fast in reaction speed, relatively thorough in organics degradation, high in ozone utilization rate and the like during organic waste water processing.

Description

technical field [0001] The invention relates to a low-temperature plasma-modified alumina-loaded iron oxide catalyst and a method for degrading organic wastewater through ozone oxidation catalyzed by the catalyst, which can effectively remove refractory organic matter in wastewater and belongs to the field of wastewater treatment. Background technique [0002] Ozone is an unstable gas with a special pungent smell. It is light blue at room temperature and dark blue in liquid state. Among the commonly used oxidants, ozone has a strong oxidizing ability. The standard electrode potential in water is 2.07eV, which can oxidize easily oxidized organic matter in wastewater, thereby achieving the purpose of decontamination; in addition, ozone is highly corrosive and kills It has a strong ability to kill bacteria and viruses, and is often used in the disinfection and sterilization treatment of tap water and recreational water. [0003] As a traditional water treatment technology, ozo...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/78
Inventor 官宝红李钰王蕴潘江江
Owner 建德市环保科技创新创业中心有限公司
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