Preparation method and application of three-dimensional porous algae-based/chitosan aerogel used for uranium-bearing wastewater treatment

A waste water treatment, three-dimensional porous technology, applied in the direction of airgel preparation, chemical instruments and methods, colloid chemistry, etc., can solve the problems of inconvenient treatment, secondary pollution, difficult recycling, etc., and achieve easy separation, high adsorption efficiency, and easy separation effect

Active Publication Date: 2019-07-19
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Both chitosan and chlorella pyrenoidosa have been reported to have good adsorption properties for uranium, but the two substrates are powder materials, which are difficult to recycle in aqueous solution and prone to secondary pollution. Inconvenience to follow-up processing

Method used

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  • Preparation method and application of three-dimensional porous algae-based/chitosan aerogel used for uranium-bearing wastewater treatment
  • Preparation method and application of three-dimensional porous algae-based/chitosan aerogel used for uranium-bearing wastewater treatment
  • Preparation method and application of three-dimensional porous algae-based/chitosan aerogel used for uranium-bearing wastewater treatment

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Embodiment 1

[0029] Such as figure 1 Shown, the present invention is used for the preparation method of the three-dimensional porous algal base / chitosan airgel of uranium-containing wastewater treatment, comprises the steps:

[0030] 1) Dissolve chitosan powder in acetic acid solution, add Chlorella pyrenoidosa and mix evenly to obtain algae / chitosan hydrogel;

[0031] 2) While stirring, inject a certain amount of foaming agent into the algae / chitosan hydrogel obtained in step 1) to form a solid gel;

[0032] 3) Freezing the solid gel obtained in step 2), and then performing solvent replacement with absolute ethanol for 3 to 5 times to obtain algae / chitosan airgel;

[0033] 4) Foam the algae / chitosan airgel obtained in step 3) with an acidic solution to form pores inside, then wash with distilled water until neutral, and dry to obtain a three-dimensional porous algae / chitosan Sugar airgel.

[0034] Wherein, in step 1), the mass fraction of the acetic acid solution is 1-2%, and the solid...

Embodiment 2

[0036] The preparation method of the three-dimensional porous algae-based / chitosan airgel used in the treatment of uranium-containing wastewater in this example differs from Example 1 in that further, in step 3), the solid gel is subjected to freezing treatment Process conditions: stand at -20°C for 6-15 hours until the gel is completely frozen.

Embodiment 3

[0038] The preparation method of the three-dimensional porous algae-based / chitosan airgel used in the treatment of uranium-containing wastewater in this example differs from Example 1 or Example 2 in that in step 4), the acidic solution used is pH 2 hydrochloric acid solution, sulfuric acid solution or nitric acid solution, the foaming time is 0.4 ~ 1h.

[0039] The preparation method of the three-dimensional porous algal base / chitosan airgel used for the treatment of uranium-containing wastewater of the present invention, in step 2), the foaming agent used is ammonium bicarbonate or sodium bicarbonate with a concentration of 10%, and foaming The dosage is 5-20% of the total volume of the gel.

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Abstract

The invention relates to a preparation method of a three-dimensional porous algae-based/chitosan aerogel and application of the three-dimensional porous algae-based/chitosan aerogel in treatment of uranium-bearing wastewater. The preparation method of the three-dimensional porous algae-based/chitosan aerogel used for uranium-bearing wastewater treatment comprises the following steps: taking chitosan and chlorella pyrenoidosa as base materials, utilizing ammonium bicarbonate and sodium bicarbonate to foam inside the aerogel and form holes, and then carrying out low temperature refrigeration andsolvent replacement to prepare the three-dimensional porous algae-based/chitosan aerogel. The three-dimensional porous algae-based/chitosan aerogel prepared in the invention is large in specific surface area and controllable in volume, can be separated from a solution easily, and has high mechanical strength. The adsorption and saturation capacity of three-dimensional porous algae-based/chitosanaerogel for uranium reaches 575 mg/g, the removal rate for uranium below 100 mg/L reaches up to 95% or more, and the three-dimensional porous algae-based/chitosan aerogel can be applied to enrichmentand removal of uranium in the water solution.

Description

technical field [0001] The invention relates to a preparation method of a functional airgel material. In particular, it relates to a method for preparing a three-dimensional porous algal base / chitosan airgel for treating uranium-containing wastewater. Background technique [0002] Under the circumstances of excessive consumption of traditional energy and increasing environmental pollution, fossil fuels are gradually being replaced by renewable energy. As an ideal low-carbon and clean energy, nuclear energy has attracted the attention of researchers. With the development of advanced nuclear technology using uranium as the main nuclear fuel, the demand for uranium has predictably increased. However, uranium has the characteristics of both radioactivity and heavy metals. It is not easy to be metabolized in the environment, and it is easy to be bioaccumulated and has a biomagnification effect. It may cause potential environmental and health risks to the biosphere through water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B01J20/28B01J20/24G21F9/04
CPCB01J13/0091B01J20/24B01J20/28047B01J20/28054G21F9/12
Inventor 王红强王清良蒋潇宇刘永胡鄂明范蓓蕾雷治武吕俊文张晓文
Owner NANHUA UNIV
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