Method for establishing photo-Fenton system for tetracycline degradation based on composite bismuth ferrite material

A composite material, bismuth ferrite technology, applied in the field of water treatment, can solve the problems of low efficiency and achieve the effect of improving utilization rate and degradation efficiency

Inactive Publication Date: 2016-12-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented new type of compound that can be used for making photocatalysts by combining certain materials together makes it more effective at absorbing light than previous methods like iron oxide or other types of catalyzer systems. Additionally, this new method allows for easy maintenance without losing its effectiveness over time.

Problems solved by technology

This patented describes various methods for removing or reducing harmful substances like tetrocytodrugs into safe waters without causing environmental concerns. These techniques include physical treatments, biological processes, photooxynthesis systems, and enzyme reactions.

Method used

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  • Method for establishing photo-Fenton system for tetracycline degradation based on composite bismuth ferrite material
  • Method for establishing photo-Fenton system for tetracycline degradation based on composite bismuth ferrite material
  • Method for establishing photo-Fenton system for tetracycline degradation based on composite bismuth ferrite material

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Experimental program
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Effect test

Embodiment 1

[0038] Graphite oxide was prepared by the Hummers method: 10.0 mL of concentrated sulfuric acid solution containing 5.0 g of potassium persulfate and 5.0 g of phosphorus pentoxide was heated to 80 °C, 10.0 g of graphite powder was added to it for pre-oxidation for 6 h, cooled and washed until neutral. Under ice-bath conditions, the obtained material was added to 230.0 mL of concentrated sulfuric acid solution, and then 30.0 g of potassium permanganate was slowly added. Adjust the temperature of the mixed solution to 25°C and react for 2 hours, add 1.0L deionized water and 25.0mL 30% oxygen peroxide to it, wash and dialyze after the reaction is complete, then collect and dry to obtain graphene oxide solid. The bismuth ferrite composite material is prepared by an alkaline hydrothermal method, and the preparation method is as follows: 1.5 g of bismuth nitrate and 1.2 g of ferric chloride are added to 5.0 mL of a 10% sodium nitrate solution. A sodium hydroxide solution with a conc...

Embodiment 2

[0041] (1) The bismuth ferrite composite material that embodiment 1 makes is dropped into the tetracycline solution of 20.0mg / L, and composite material concentration is 0.5g / L;

[0042] (2) Adjust the pH value of the solution to 3.0, 5.0 and 7.0, turn on the magnetic stirrer, and mix the material with the solution for 60 minutes;

[0043] (3) Turn on the xenon lamp to start the photocatalytic reaction;

[0044] (4) Sampling during the reaction process, the sample uses a filter membrane to remove the composite material, and the concentration of tetracycline in the remaining solution is measured by high performance liquid chromatography. After the photocatalytic reaction continues for 120min, the detection tetracycline removal rate is 83.9%, 83.7% and 90.8%, respectively, See figure 2 .

Embodiment 3

[0046] (1) The bismuth ferrite composite material that embodiment 1 makes is dropped into the tetracycline solution of 20.0mg / L, and composite material concentration is 0.5g / L;

[0047] (2) Adjust the pH value of the solution to 3.0, 5.0 and 7.0, turn on the magnetic stirrer, and mix the material with the solution for 60 minutes;

[0048] (3) Dosing H 2 o 2 Aqueous solution, H in solution 2 o 2 The concentration is 0.5mmol / L;

[0049](4) Sampling in the reaction process, after the sample uses the filter membrane to remove the composite material, measure the tetracycline concentration in the remaining solution by high performance liquid chromatography, after the reaction continues for 120min, the detection tetracycline removal rate is respectively 69.5%, 63.4% and 40.1%, see image 3 .

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Abstract

The invention relates to method for establishing a photo-Fenton system for tetracycline degradation based on a composite bismuth ferrite material. The method specifically comprises the following steps that 1, bismuth nitrate and ferric chloride are added to a nitrate solution, stirring is performed achieve dissolution, then a sodium hydroxide solution A is dropwise added, a pH value is regulated to be 9-10, and a mixed reaction solution is prepared; 2, graphite oxide is added to the mixed reaction solution, and ultrasonic operation is performed to obtain the co-precipitate of iron hydroxide, hydroxide bismuth and graphene; 3, the co-precipitate is centrifugally cleaned with pure water for several times, then a sodium hydroxide solution B is added to the co-precipitate to make the co-precipitate completely dissolved, and the co-precipitate is transferred to a hot water kettle for hydrothermal reaction; 4, the composite material is put in the Fenton system for tetracycline wastewater degradation. Compared with the prior art, the preparation method is simple, the controllability is good, the pollutant degradation efficiency is high, meanwhile the material stability is good, and the method can be repeatedly adopted, is low in cost and has a very good application prospect.

Description

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Claims

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Application Information

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Owner TONGJI UNIV
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