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Iron-manganese-cobalt co-doped supported Fenton catalyst, preparation method and application thereof

A catalyst and co-doping technology, applied in the direction of chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of single active component, low removal efficiency, surface pH affecting catalyst activity, etc. , to achieve the effects of widening the pH range, stable operation, and stable COD removal rate

Inactive Publication Date: 2019-03-29
WEIFANG VOCATIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, compared with the homogeneous Fenton method, the heterogeneous Fenton catalysts in the prior art have a single active component, relatively low removal efficiency, a certain degree of consumption after repeated use, and surface pH changes that affect the activity of the catalyst. and many other issues

Method used

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  • Iron-manganese-cobalt co-doped supported Fenton catalyst, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of iron-manganese-cobalt co-doped supported Fenton catalyst is based on TiO 2 -Al 2 O 3 as the carrier, with Fe(NO 3 ) 3 ·9H 2 O, Mn (NO 3 ) 2 ·4H 2 O, CoCl 2 ·6H 2 O is a reaction precursor prepared into a catalyst impregnation solution, prepared by an impregnation method, and then obtained by filtration, washing, drying and roasting.

Embodiment 2

[0035] (1) Carrier pretreatment: TiO with a particle size of 2 to 3 mm 2 -Al 2 O 3 The carrier is decontaminated and dried.

[0036] (2) Preparation of impregnation solution: preparation of Fe 3+ , Mn 2+ and Co 2+ Fe(NO) with a molar concentration ratio of 2:1:1 3 ) 3 ·9H 2 O, Mn (NO 3 ) 2 ·4H 2 O, CoCl 2 ·6H 2 Aqueous O solution, adjusted to pH 6.8 with NaOH.

[0037] (3) Impregnation: the pretreated TiO 2 -Al 2 O 3 The carrier was completely immersed in the prepared immersion solution, stirred slowly at a constant speed, fully immersed for 12 hours, filtered after the immersion, and the catalyst was washed with clean water.

[0038](4) Roasting: place the catalyst obtained in step (3) in an oven at 120 °C for 2.5 hours, then move it to a muffle furnace for roasting at 480 °C for 5 hours, and place the roasted catalyst in a desiccator for natural cooling to obtain the iron-manganese-cobalt co-doped supported Fenton catalyst.

Embodiment 3

[0040] (1) Carrier pretreatment: TiO with a particle size of 2 to 4 mm 2 -Al 2 O 3 The carrier is decontaminated and dried.

[0041] (2) Preparation of impregnation solution: preparation of Fe 3+ , Mn 2+ and Co 2+ Fe(NO) with a molar concentration ratio of 1:1:1 3 ) 3 ·9H 2 O, Mn (NO 3 ) 2 ·4H 2 O, CoCl 2 ·6H 2 Aqueous O solution, adjusted to pH 7.0 with NaOH.

[0042] (3) Impregnation: the pretreated TiO 2 -Al 2 O 3 The carrier is completely immersed in the prepared immersion solution, stirred slowly at a constant speed, fully immersed for 14 hours, filtered after the immersion is completed, and the catalyst is washed with clean water.

[0043] (4) Roasting: the catalyst obtained in step (3) was placed in an oven to be dried at 122°C for 2 hours, then moved to a muffle furnace for calcination at 500°C for 4.5 hours, and the roasted catalyst was placed in a desiccator for natural cooling to obtain the iron-manganese-cobalt co-doped supported Fenton catalyst. ...

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Abstract

The invention discloses an iron-manganese-cobalt co-doped supported Fenton catalyst, a preparation method and application thereof. The catalyst is a co-doped Fenton catalyst in which TiO2-Al2O3 is adopted as a carrier and Fe, Mn and Co active components are loaded. The method includes (1) decontaminating and drying the TiO2-Al2O3 carrier; (2) preparing an aqueous solution in which the mole ratio of Fe<3+>, Mn<2+> and Co<2+> is 1:1:1 to 3:1:1, and adjusting the pH to 6.5-7.5; (3) soaking the TiO2-Al2O3 carrier in a soaking solution for 10-20 h, and washing the catalyst with clear water; and (4)drying the catalyst at 115-125 DEG C, roasting the catalyst at 450-500 DEG C for 4-6 h, and naturally cooling the catalyst. The catalyst is used for treating chemical comprehensive wastewater, and has improved catalytic activity and stability, and adaptability to the pH of the reaction wastewater.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a Fenton catalytic oxidation technology. Background technique [0002] Fenton catalytic oxidation is an advanced oxidation treatment technology in sewage treatment. It has the advantages of high removal rate of organic pollutants, low investment and operating costs, adaptability to various wastewater treatment, simple equipment and easy operation. Sewage treatment technology. The Fenton catalytic oxidation process is divided into two types: homogeneous catalysis and heterogeneous catalysis, and homogeneous catalysis is mostly used at this stage. [0003] The homogeneous Fenton method has the disadvantages of low suitable pH value, narrow pH range, large amount of iron sludge, not easy to recover, and high effluent color, which greatly limits its application. Some improved homogeneous Fenton technology accelerates The speed of the oxidation reaction process is improved,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C02F1/72C02F101/30
CPCB01J23/002B01J23/8892B01J2523/00C02F1/722C02F1/725C02F2101/30C02F2209/08C02F2305/026B01J2523/31B01J2523/47B01J2523/72B01J2523/842B01J2523/845
Inventor 王萌韩晓琳韩文婧高庆平李雪贞
Owner WEIFANG VOCATIONAL COLLEGE
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