A kind of preparation method of gamma-feooh catalyst

A technology of catalyst and iron shavings, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of uneven adhesion of γ-FeOOH, etc., and achieve the effect of high adhesion strength and enhanced removal effect.

Active Publication Date: 2021-09-28
HUNAN HUAYI MUNICIPAL ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The technical problem solved by the present invention is: aiming at the problem of uneven adhesion of existing γ-FeOOH on the carrier, an improved preparation method of γ-FeOOH catalyst is provided, using iron shavings produced by cutting iron and steel materials as a carrier to increase γ-FeOOH Attachment purity and uniformity of FeOOH on the support

Method used

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  • A kind of preparation method of gamma-feooh catalyst
  • A kind of preparation method of gamma-feooh catalyst

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Embodiment 1

[0036] The present embodiment prepares iron-based catalysts under laboratory conditions according to the preparation method of the present invention, and the specific steps are as follows:

[0037] (1) Washing of iron shavings: immerse 200g of iron shavings in a sodium hydroxide solution with a concentration of 0.01M for 40 minutes to remove the oil remaining on the surface, then remove and rinse, and then immerse in a sulfuric acid solution with a concentration of 0.01M Etching for 40 minutes to make the surface rough and easy to modify, wash and set aside after etching;

[0038] (2) Immerse the iron shavings treated in step (1) in a mixed solution of 2L of sodium sulfate and ammonium sulfate for 5 minutes, the concentration of sodium sulfate is 0.05M, and the concentration of ammonium sulfate is 0.05M, and the iron shavings are taken out and air-dried for 10 minutes after centrifugal dehydration , repeat the operation for 60 minutes alternately between dry and wet, so that t...

Embodiment 2

[0042] (1) the washing of iron shavings is with embodiment 1;

[0043] (2) Immerse 200g of iron shavings treated according to 1) in a mixed solution of 2L of sodium sulfate (0.05M) and ammonium sulfate (0.05M) for 5 minutes, remove and centrifugal dehydrate, air-dry for 10 minutes, and then repeat the immersion operation for 5 minutes. Repeat the operation for 50 minutes so that the surface is covered with a large area of ​​green embroidery;

[0044] (3) Weigh 200g of the obtained iron shavings covered with green embroidery and immerse them in the solution of (2), then continuously expose oxygen into the solution for 60 minutes using a micro-nano bubble generator; finally remove the iron shavings, rinse them, dry them, Finally, the surface-loaded γ-FeOOH catalyst with iron shavings as the carrier was obtained. The time of using pure oxygen aeration can be slightly less than the air aeration time adopted in Example 2.

[0045] Such as figure 1 as shown in figure 1 The XRD a...

Embodiment 3

[0047] In this embodiment, the conditions for uniform generation of surface green rust of iron shavings by alternating drying and wetting are specifically described.

[0048] 1) the washing of iron shavings is with embodiment 1;

[0049] The first group immerses 200g of iron shavings treated according to step (1) in 2L of a mixed solution of sodium sulfate and ammonium sulfate for 5 minutes, wherein the concentration of sodium sulfate is 0.05M, and the concentration of ammonium sulfate is 0.05M, and the iron shavings are taken out and air-dried after centrifugal dehydration 10 minutes, then repeat the immersion operation for 5 minutes, and repeat the operation for 50 minutes so that the surface is covered with a large area of ​​green embroidery; during the experiment, observe the formation of green rust on the surface of the iron shavings;

[0050] In the second group, 200 g of iron shavings treated according to step (1) were immersed in 2L of a mixed solution of sodium sulfat...

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Abstract

The invention discloses a preparation method of a γ-FeOOH catalyst. The preparation method of the catalyst is to carry out alkali washing treatment on iron shaving raw materials to remove oil remaining on the surface, and then carry out acid washing to etch the surface so as to become rough, so as to Loading on γ‑FeOOH; immerse the treated iron shavings in the electrolyte solution for a certain period of time, then remove them for dehydration and air-dry them for a certain period of time, and repeat the alternating dry and wet treatment; finally, immerse the iron shavings in the electrolyte solution, and Micro-nano bubbles are introduced into the solution, taken out, rinsed, and dried. The preparation method is simple in operation, mild in conditions, and low in cost. The surface-loaded γ-FeOOH catalyst using iron shavings as a carrier of the present invention is applied to catalyze the oxidation of ozone to degrade water The organic pollutants in the system show high catalytic ozonation activity, which can effectively degrade the organic pollutants in the water system.

Description

technical field [0001] The invention discloses a preparation method of a gamma-FeOOH catalyst, in particular to a sewage treatment catalyst using iron shavings as a carrier and carrying gamma-FeOOH on the surface, and belongs to the technical field of catalytic oxidation sewage treatment. Background technique [0002] Iron exists in nature in the form of compounds. There are many types of iron-containing minerals, some of which have industrial value, and some have certain catalytic properties, such as goethite (α-FeOOH), teregonite (β -FeOOH), lepidocite (γ-FeOOH), etc. In recent years, the amazing potential of functional materials such as iron oxyhydroxide (FeOOH) in catalytic performance has attracted extensive attention of researchers. [0003] The study found that the iron-based catalyst catalyzed ozone for advanced treatment of a coal chemical industry wastewater, and the COD removal rate reached 67%, and the TOC removal rate reached 59%, which was significantly improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J37/34B01J37/14C02F1/72C02F1/78
CPCB01J23/745B01J35/0013B01J37/14B01J37/348C02F1/725C02F1/78
Inventor 曾科刘玉莎周永信汪滨陈文韬黄成涛陈剑
Owner HUNAN HUAYI MUNICIPAL ENG DESIGN
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