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Method for preparing iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst

A technology of iron oxyhydroxide and catalyst, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effect of improving efficiency, high catalytic ability, and improving catalytic efficiency

Active Publication Date: 2019-07-30
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the existing printing and dyeing wastewater and heavy metal wastewater treatment problems

Method used

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  • Method for preparing iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst
  • Method for preparing iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst
  • Method for preparing iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Firstly, an iron sulfide-supported crystalline iron oxyhydroxide catalyst was prepared.

[0043] Such as figure 1 As shown, a one-step hydrothermal method was used to synthesize the obtained FeS 2 It is nanoscale, and α-FeOOH is nanoscale. The specific synthesis method is as follows:

[0044] (1) Accurately weigh 0.84g ferrous sulfate heptahydrate (FeSO 4 ·7H 2 O), it was completely dissolved in 35ml deionized water by stirring; the molar concentration was 0.15mol / L.

[0045] (2) Accurately weigh 2.92g of anhydrous sodium sulfite (Na 2 SO 3 ), which was completely dissolved in 25ml deionized water by stirring; the molar concentration was 1.2mol / L

[0046] (3) Slowly add the dissolved sodium sulfite solution dropwise into the ferrous sulfate solution under stirring, and fully stir for one hour at a speed of 300±30r / min;

[0047] (4) After the stirring is completed, slowly pour the slurry into a stainless steel high-pressure reactor lined with polytetrafluoroethyle...

Embodiment 2

[0063] Degradation of heavy metal Cr in water over iron sulfide-supported crystalline iron oxyhydroxide catalyst 6+ Methods:

[0064] Effectively degrade heavy metal ions in water under acidic conditions, utilize potassium dichromate to prepare 100mg / L chromium ion solution for subsequent use, get 15mL preparation solution, then get 35mL deionized water, prepare 50mL concentration as chromium ion solution of 30mg / L, pass Dilute hydrochloric acid is used to adjust the pH value of the solution between 2-4.

[0065] 1. Add the treated chromium ion solution to the photocatalytic reactor, then add nano-semiconductor photocatalyst to the photocatalytic reactor, and form a mixture in the photocatalytic reactor; stir the solution at a speed of 200±20r / min , to form a uniform slurry, cover the photocatalytic reactor with a dark reaction hood, provide a dark reaction environment, and stir for a period of time under no light conditions to allow the composite photocatalyst to fully absor...

Embodiment 3

[0073] The method of effectively degrading the macromolecular dye Rhodamine B in water under acidic conditions:

[0074] Specifically: use Rhodamine B to prepare a 100mg / L dye solution for later use, take 15mL of the prepared solution, then take 35mL of deionized water, prepare 50mL of a dye solution with a concentration of 30mg / L, and adjust the pH value of the solution to 2 with dilute hydrochloric acid. Between -4.

[0075] 1. Add the treated dye solution to the photocatalytic reactor, and then add nano-semiconductor photocatalyst to the photocatalytic reactor to form a mixture in the photocatalytic reactor; stir the solution at a speed of 200±20r / min, Make it form a uniform slurry, cover the photocatalytic reactor with a dark reaction hood, provide a dark reaction environment, and stir for a period of time under no light conditions to allow the composite photocatalyst to fully absorb chromium ions in water. After the adsorption is complete, take the upper solution to meas...

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Abstract

The invention discloses a method for preparing an iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst. The method is characterized in that the catalyst is synthesized by means of a one-step hydrothermal method, an anhydrous sodium sulfite ion aqueous solution is slowly added dropwise into ferrous sulfate heptahydrate solution ionized water, high-speed stirring is carried out, thenthe whole mixed solution is put into a high-pressure reaction kettle, the high and constant temperature is kept for heating, after cooling is conducted to room temperature, high-speed centrifugal separation is conducted to obtain the iron-sulfide-supported alpha-crystal-form iron oxyhydroxide catalyst material, and synthesized FeS2 and alpha-FeOOH are both nano-scale materials, wherein the mole ratio of ferrous sulfate heptahydrate to anhydrous sodium sulfite is 1:(8+ / -0.1), the reaction temperature of the ferrous sulfate heptahydrate and the anhydrous sodium sulfite in the high-pressure reaction kettle is 160-200 DEG C, and the reaction time is 1-2 hours. By means of the method, iron oxyhydroxide and iron sulfide are supported together, the efficiency is improved on the premise of savingresources, and the purpose of directionally removing heavy metal ions and macromolecular organic pollutants in water is achieved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing an α crystal form iron oxyhydroxide catalyst loaded with iron sulfide. Background technique [0002] With the rapid development of the printing and dyeing industry and the metal industry, the illegal discharge of a large amount of printing and dyeing wastewater and high-valence heavy metal wastewater has caused a large amount of water pollution, which seriously threatens the natural environment and human life, health and safety. How to quickly and effectively degrade macromolecular dyes and restore Heavy metal ions have become a widely studied issue in the environmental field. Most water-soluble azo dyes contain benzene rings and are stable in nature. Traditional chemical and biological methods are difficult to achieve good results. The use of photocatalysts to photocatalytically degrade pollutants in water is a more commonly used method now. The use of lig...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/10C02F1/30C02F101/30
CPCB01J27/043C02F1/30C02F2101/308B01J35/39B01J35/61
Inventor 郭亚丹李晨曦李鹏王学刚
Owner EAST CHINA UNIV OF TECH
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