Method for treating uranium-containing wastewater by TiO2 adsorption-photocatalytic reduction

A photocatalysis and waste water technology, applied in the field of uranium mine environmental treatment, can solve the problems of secondary pollution, energy consumption, reagent consumption, etc., and achieve high-efficiency treatment, low energy consumption, and good selectivity

Inactive Publication Date: 2020-01-07
BEIJING RES INST OF URANIUM GEOLOGY
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AI Technical Summary

Problems solved by technology

The above technologies can achieve a certain purification effect in the treatment of uranium-containing radioactive wastewater, but consume energy and reagents, and the treatment effect for low-concentration uranium-containing wastewater is not ideal.
In addition, most of the traditional treatment methods are just a simple physical separation process that transfers pollutants from one phase to another, thus causing secondary pollution

Method used

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  • Method for treating uranium-containing wastewater by TiO2 adsorption-photocatalytic reduction
  • Method for treating uranium-containing wastewater by TiO2 adsorption-photocatalytic reduction
  • Method for treating uranium-containing wastewater by TiO2 adsorption-photocatalytic reduction

Examples

Experimental program
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Effect test

example 1

[0043] Example 1: 0g, 0.1g, 0.2g, 0.4g nano TiO 2 Drop into U(Ⅵ) solubility is 15.3mg / L, in the uranium-containing U(Ⅵ) waste water solution that volume is 50mL, adjust the pH of solution with 0.1mol / L HCl or 0.1mol / L NaOH to be 7, above-mentioned solution Respectively in the presence of light and TiO 2 with and without TiO 2 Under certain conditions, put it in a shaker to react for 120 minutes, and measure the uranium concentration of the uranium-containing wastewater after the reaction every 30 minutes. The experimental results show that, if figure 1 As shown, under the condition of light, TiO 2 The catalyst can fix U(Ⅵ) in uranium-containing wastewater in a short time, up to 99.0%, and with TiO 2 The increase of the dosage of catalyst presents the characteristics of enhanced immobilization effect; in addition, contrast light +0.1g TiO 2 With light +0.2g ​​TiO 2 The experimental data curve under the conditions found that light +0.2g ​​TiO 2 There is an obvious two-sta...

example 2

[0044] Example 2: 0.05g, 0.1g, 0.15g, 0.2g nano TiO 2 Drop into U(VI) solubility is 2.0mg / L, in the uranium-containing U(VI) waste water solution that volume is 100mL, adjust the pH of solution with 0.1mol / L HCl or 0.1mol / L NaOH to be 7, the above solution Under the conditions of no light and light, respectively, put them in a shaker for 120 minutes, and measure the uranium concentration of the uranium-containing wastewater after the reaction every 20 minutes. The experimental results show that, if figure 2 As shown, TiO in the absence of light 2 The photocatalyst showed a certain degree of adsorption, the adsorption rate reached 20%, and the TiO 2 The catalyst exhibited excellent photocatalytic reduction activity for U(Ⅵ), and the reduction rate could reach 99.0%. 2 The increase of catalyst dosage shows the characteristics of enhanced reduction effect, indicating that nano-TiO 2 U(Ⅵ) in uranium-containing wastewater can be reduced to U(Ⅳ) through adsorption-photocatalyti...

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Abstract

The invention belongs to the field of uranium mine environment treatment, in particular, relates to a method for treating uranium-containing wastewater by TiO2 adsorption-photocatalytic reduction, andaims to provide a novel material for radioactive uranium-containing wastewater treatment. The method is characterized in that a TiO2 photocatalytic reduction technology is introduced into a uranium-containing wastewater treatment process; nano TiO2 is added into the uranium-containing wastewater, the feasibility that the TiO2 treats U (VI) in the uranium-containing wastewater through the adsorption-photocatalytic reduction effect is demonstrated, 99.0% of uranium in the uranium-containing wastewater can be fixed to the maximum extent, and the nano TiO2 can be used as a novel material for treating the uranium-containing wastewater. The method has the advantages of low energy consumption, no toxicity, good selectivity, rapidness, high efficiency, capability of being carried out at normal temperature and normal pressure and the like; the novel material TiO2 is different from other adsorption and reduction materials for treating the radioactive uranium-containing wastewater, has adsorption-autocatalytic reduction dual properties, and can achieve the purposes of uranium-containing wastewater treatment and uranium recovery more efficiently.

Description

technical field [0001] The invention belongs to the field of environmental treatment of uranium mines, in particular to a 2 A method for treating uranium-containing wastewater by adsorption-photocatalytic reduction. Background technique [0002] With the rapid development of science and technology and nuclear power, in various fields of the nuclear industry, such as uranium mining and tailings storage, refining and processing of hydrometallurgy uranium, nuclear fuel manufacturing, nuclear power plant operation, reactor fuel reprocessing, etc., will generate a large amount of How to properly treat these radioactive uranium-containing wastewater is very important for protecting the environment, maintaining national safety and maintaining the sustainable development of nuclear power. [0003] As we all know, uranium in radioactive uranium-containing wastewater mainly coexists with other ions and compounds in two valence states of U(IV) and U(VI), among which U(IV) can form a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08
CPCC02F1/28C02F1/30C02F1/38C02F1/70C02F9/00C02F2101/006
Inventor 丁波刘红旭王文全易超张宾刘章月
Owner BEIJING RES INST OF URANIUM GEOLOGY
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