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Mg-Fe bimetal hydroxide adsorbent and preparation method and application thereof

A hydroxide and adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of slow adsorption rate, uranium adsorption, poor adsorption effect, etc., and achieve the adsorption rate Fast, large adsorption capacity, effective adsorption effect

Inactive Publication Date: 2019-03-29
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing adsorbents used for the treatment of uranium-containing wastewater have the problems of slow adsorption rate, poor adsorption effect and inability to selectively adsorb uranium.

Method used

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  • Mg-Fe bimetal hydroxide adsorbent and preparation method and application thereof
  • Mg-Fe bimetal hydroxide adsorbent and preparation method and application thereof
  • Mg-Fe bimetal hydroxide adsorbent and preparation method and application thereof

Examples

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preparation example Construction

[0030] The embodiment of the present invention also provides a method for preparing a Mg-Fe double metal hydroxide adsorbent, which includes: performing a hydrothermal reaction with the iron-magnesium mixed solution formed after mixing the iron salt and the magnesium salt, and the hydroxide solution, and Centrifuge. Magnesium ions and iron ions form Mg-Fe double-layer hydroxide under alkaline hydrothermal conditions, so that magnesium hydroxide spreads on the surface of iron hydroxide, so that the physical defects and chemical active sites of magnesium hydroxide are fully exposed. To promote the adsorption of uranyl ions in wastewater.

[0031] Specifically, the iron salt is selected from any one of ferric chloride, ferric nitrate and ferric sulfate, preferably ferric chloride, more preferably ferric chloride hexahydrate; similarly, the magnesium salt is selected from magnesium chloride, magnesium nitrate and magnesium sulfate Any one of them is preferably magnesium chloride,...

Embodiment 1

[0041] The present embodiment provides a kind of preparation method of Mg-Fe double metal hydroxide adsorbent, it comprises the following steps:

[0042] Dissolve ferric nitrate and magnesium nitrate in deionized water to obtain a mixed solution of iron and magnesium, wherein the molar ratio of Mg / Fe is 3:1, and the total concentration of magnesium ions and iron ions in the mixed solution of iron and magnesium is 0.07mol / L. Pour the iron-magnesium mixture into the hydrothermal reaction liner, and add 0.5 mol / L NaOH solution (total amount is excess relative to the molar amounts of iron ions and magnesium ions), so that the pH of the system is 10. Put the lining into the autoclave for 100 minutes under the conditions of 160°C and 5.5Mpa. After the reaction was completed, it was taken out, centrifuged and washed until the supernatant was neutral, and the obtained solid was freeze-dried at -40°C for 10 hours and dried for later use.

[0043] This embodiment also provides a treatm...

Embodiment 2

[0045] The present embodiment provides a kind of preparation method of Mg-Fe double metal hydroxide adsorbent, it comprises the following steps:

[0046] Dissolve ferric chloride hexahydrate and magnesium chloride hexahydrate in deionized water to obtain a mixed solution of iron and magnesium, wherein the molar ratio of Mg / Fe is 5:1, and the total concentration of magnesium ions and iron ions in the mixed solution of iron and magnesium is 0.012mol / L . Pour the iron-magnesium mixture into the hydrothermal reaction lining, and add 1.5 mol / L NaOH solution (the total amount is excessive relative to the molar amounts of iron ions and magnesium ions), so that the pH of the system is 13. Put the lining into the autoclave for 150min under the conditions of 200°C and 6.5Mpa. After the reaction was completed, it was taken out, centrifuged and washed until the supernatant was neutral, and the obtained solid was freeze-dried at -60°C for 14 hours and dried for later use.

[0047] This e...

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Abstract

The invention discloses an Mg-Fe bimetal hydroxide adsorbent and a preparation method and application thereof, and relates to the technical field of adsorbents. The Mg-Fe bimetal hydroxide adsorbent is of a sheet structure and is formed by loading magnesium hydroxide on a ferric hydroxide surface layer; preferably, the adsorbent is prepared by hydrothermal reaction of Fe-Mg mixed liquid formed bymixing a ferric salt and a magnesium salt with a hydroxide solution; and more preferably, the mol ratio of the magnesium salt to the ferric salt is (3-5):1. According to the preparation method of theMg-Fe bimetal hydroxide adsorbent, by means of hydrothermal reaction of the Fe-Mg mixed liquid formed by mixing the ferric salt and the magnesium salt with the hydroxide solution, the magnesium hydroxide is spread on the ferric hydroxide surface layer, and by optimizing the ratio of the magnesium hydroxide and the ferric hydroxide, the selection of the raw materials and the preparation conditions,the finally obtained adsorbent can more effectively adsorb uranium in wastewater. The prepared adsorbent has a large adsorption capacity for uranium, has a high adsorption rate, and can be applied totreatment of uranium-containing wastewater.

Description

technical field [0001] The invention relates to the technical field of adsorbents, and in particular to a Mg-Fe double metal hydroxide adsorbent, a preparation method and application thereof. Background technique [0002] Under the current international background of energy shortage and environmental constraints, nuclear power is favored by all countries because of its clean, efficient, low-carbon, and economical characteristics. As the main fuel for nuclear power generation, natural uranium is the foundation of nuclear power development. Its supply is related to the stability of the operation of the nuclear power industry. It is estimated that by 2020, my country's annual demand for natural uranium will reach 16,400 tons. In order to meet the development of my country's nuclear power industry, it is necessary to intensify the exploration, mining and dressing and smelting of uranium resources. However, the mining and dressing process of uranium mines will produce a large am...

Claims

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Application Information

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IPC IPC(8): B01J20/06C02F1/28B01J20/30
CPCB01J20/041B01J20/06C02F1/281C02F2101/006
Inventor 王学刚李鹏聂世勇刘志朋王立章
Owner EAST CHINA UNIV OF TECH
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