Method for extracting uranium by utilizing photocatalysis technology under visible light

Abstract

The invention discloses a method for extracting uranium by utilizing a photocatalysis technology under visible light. The method comprises the following steps: performing ultrasonic treatment on C3N4to make the C3N4 fully and uniformly dispersed, adding glucose and Cd(NO3)2.4H2O, performing magnetic stirring, adding L-cysteine, continuing stirring, moving the stirred material to a high-pressure reaction kettle, placing the obtained material in a drying oven, performing constant-temperature treatment, performing cooling, performing suction filtration, performing washing by using ultrapure water and absolute ethanol for a plurality of times, performing freeze drying, performing grinding, adding the ground material into a quartz tube, adding a UO2(NO3)2 solution and ultrapure water or seawater, introducing N2 for a period of time under the dark condition, placing the obtained material under natural light or a xenon lamp, performing irradiation for 10 min, filtering the suspension, adding1 mL of water into the obtained solid, placing the obtained material in air for 24 h, adding 1 mL of 0.1 mol / L Na2CO3 solution, performing desorption for 30 min, and performing filtration, wherein the extracted uranium is obtained in the supernatant. The method disclosed by the invention has the beneficial effects that 0.1 mmol / L uranium in 15 mL of seawater system can be completely extracted within 10 min under irradiation of the visible light.

Description

technical field [0001] The invention belongs to the technical field of new energy development and relates to extracting uranium from uranium-containing water as new energy. Background technique [0002] With the rapid development of nuclear energy, the development and utilization of uranium resources is of great significance to the sustainable development of our country's social economy. There are about 4.5 billion tons of uranium in the global seawater, which is thousands of times the known uranium resources on land. The existing methods for extracting uranium from seawater mainly use the adsorption method, but this method has poor selectivity to uranium, low extraction efficiency, difficult elution, and high cost. The concept of extracting uranium from seawater (including salt lake water) solely by photocatalysis has not been reported yet. At present, the reported methods of photocatalytic reduction and separation of uranium are only suitable for research in laboratory u...

AI Technical Summary

Problems solved by technology

There have been a small number of experiments in foreign countries to extract uranium from seawater by using photoelectrocatalysis, but an additional electric field is required, the operation is complicated, the efficiency is low and the cost is high

[0003] To sum up, the problems existing in the existing technology of extracting uranium from seawater are: the adsorption method has disadvantages such as poor selectivity, difficult elution, and low efficiency; Under light, the efficiency is low, and additional electron sacrificial agents need to be added; although the reported photocatalytic method can separate uranium from seawater, it requires an additional electric field to increase the cost and is not efficient

All in all, the existing technology is still difficult to use sunlight to directly photocatalyze the extraction of uranium from seawater.

This is related to the inefficiency of the catalyst used

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