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Preparation method of magnetic nano-fe3o4 biocatalysis and its application in the treatment of uranium-containing wastewater

A magnetic nano, biocatalytic technology, applied in water/sewage treatment, adsorbed water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as threats to human living environment, environmental pollution, etc., and achieve a very good adsorption effect , Strong chemical stability, the effect achieved by heating conditions

Inactive Publication Date: 2015-08-19
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrite is a carcinogen, and its use can easily cause environmental pollution and pose a great threat to the human living environment

Method used

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  • Preparation method of magnetic nano-fe3o4 biocatalysis and its application in the treatment of uranium-containing wastewater
  • Preparation method of magnetic nano-fe3o4 biocatalysis and its application in the treatment of uranium-containing wastewater
  • Preparation method of magnetic nano-fe3o4 biocatalysis and its application in the treatment of uranium-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The first step, cultivation and domestication of Thiobacillus ferrooxidans

[0034] Measure 20 mL of 745 uranium ore acid pit wastewater into a 250 mL Erlenmeyer flask, add 180 mL of modified 9K medium, and plug it with a sterile cotton plug. Place the Erlenmeyer flask at a temperature of 25 o C. Shaking culture was carried out in a constant temperature incubator with a rotational speed of 100 r / min. When the color of the solution in the Erlenmeyer flask changed from light green to red, take 30 mL of the solution in it to re-cultivate and domesticate twice according to the above method, and then the required Thiobacillus ferrooxidans liquid can be obtained.

[0035] The second step, the preparation of biopolymeric ferric sulfate

[0036] The obtained Thiobacillus ferrooxidans solution was mixed with FeSO 4 ·7H 2 The mass ratio of the O solution is 1.0:2.0, put it into a 250 mL beaker, heat it in a water bath, adjust the pH value of the reaction system to 6.0, and th...

Embodiment 2

[0042] The first step, cultivation and domestication of Thiobacillus ferrooxidans

[0043] Specifically with embodiment 1.

[0044] The second step, the preparation of biopolymeric ferric sulfate

[0045] The obtained Thiobacillus ferrooxidans solution was mixed with FeSO 4 ·7H 2 The mass ratio of the O solution was 1.0:2.0, put it into a 250 mL beaker, heated in a water bath, adjusted the pH value of the reaction system to 7.0, and the reaction temperature was 25 o c. At the same time, control the quality of Thiobacillus ferrooxidans liquid on FeSO 4 Biocatalytic oxidation process to produce Fe 3+ : Fe 2+ A 1:1 solution of biopolymeric ferric sulfate.

[0046] The third step, magnetic nano-Fe 3 o 4 Synthesis of particles

[0047] Put 100 mL of 1.0 mol / L NaOH solution in a 500 mL beaker, put a cup-shaped semi-permeable membrane filled with 200 mL of distilled water into the beaker, and then add biopolymeric ferric sulfate solution dropwise to the semi-permeable membr...

Embodiment 3

[0051] The first step, cultivation and domestication of Thiobacillus ferrooxidans

[0052] Specifically with embodiment 1.

[0053] The second step, the preparation of biopolymeric ferric sulfate

[0054] The obtained Thiobacillus ferrooxidans solution was mixed with FeSO 4 ·7H 2 The mass ratio of the O solution was 1.0:3.0, put it into a 250 mL beaker, heated in a water bath, adjusted the pH value of the reaction system to 7.0, and the reaction temperature was 20 o c. At the same time, control the quality of Thiobacillus ferrooxidans liquid on FeSO 4 Biocatalytic oxidation process to produce Fe 3+ : Fe 2+ A 1:1 solution of biopolymeric ferric sulfate.

[0055] The third step, magnetic nano-Fe 3 o 4 Synthesis of particles

[0056] Put 100 mL of 1.0 mol / L NaOH solution in a 500 mL beaker, put a cup-shaped semi-permeable membrane filled with 200 mL of distilled water into the beaker, and then add biopolymeric ferric sulfate solution dropwise to the semi-permeable membr...

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Abstract

The invention provides an ecological and environment-friendly new method for preparing magnetic nano Fe3O4 particles by biological catalysis, and application of the particles to treatment of uranium-containing wastewater. The method comprises the following concrete steps: (1) culturing and domesticating thiobacillus ferrooxidans; (2) preparing bio-polymeric ferric sulfate; (3) synthesizing the magnetic nano Fe3O4 particles; (4) performing a test of adsorbing uranium in the uranium-containing wastewater by the magnetic nano Fe3O4 particles. The obtained magnetic nano Fe3O4 particles are simple in preparation synthesis route, mild in reaction condition and easy to operate; a biological catalysis oxidant is used for replacing a conventional chemical oxidant (nitrite), so that cancerogenic substances are prevented from being discharged to the environment and the environment-friendly effect is really achieved. Meanwhile, the obtained magnetic nano Fe3O4 particles can reduce the content of uranium in the low-concentration uranium-containing wastewater with the concentration of 0.45-0.50mg / L by more than 90% and have very important practical meaning in aspects of uranium-containing wastewater treatment, uranium recovery and the like in uranium mining and metallurgy.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, in particular to the preparation of magnetic nano-Fe by biocatalysis 3 o 4 Particles and their application in the treatment of uranium-containing wastewater. Background technique [0002] As the main fuel for nuclear power, uranium is also an urgently needed strategic material for national defense construction. With the continuous and safe development of nuclear power and the continuous transformation and upgrading of national defense construction (nuclear military industry), my country's annual demand for natural uranium is increasing year by year, and uranium supply will still face enormous pressure. In order to meet the increasing demand for uranium resources for military and civilian purposes, it is necessary to increase the mining and processing of uranium resources. [0003] However, with the current process conditions, technologies and methods, the low co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 彭国文丁德馨肖方竹张志军王永东胡南王晓亮
Owner NANHUA UNIV
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