A molybdenum ion-imprinted amino-functionalized chitosan adsorbent and its preparation method and application

A technology of amino function and chemical chitosan, which is applied in chemical instruments and methods, adsorption water/sewage treatment, inorganic chemistry, etc., can solve problems such as high operating costs, secondary pollution, and cumbersome operations, and achieve low cost and reduced Pollution, the effect of improving economic benefits

Active Publication Date: 2018-09-21
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The most prominent shortcomings of these methods are that the operation is cumbersome when treating low-concentration metal wastewater, the operating cost is high, the energy consumption is large, and it is easy to cause secondary pollution.
In the past two decades, the solvent extraction method has been widely used in the production of scattered metals due to its technical superiority and significant economic benefits, but its disadvantages are easy emulsification and high loss rate, etc.

Method used

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  • A molybdenum ion-imprinted amino-functionalized chitosan adsorbent and its preparation method and application
  • A molybdenum ion-imprinted amino-functionalized chitosan adsorbent and its preparation method and application
  • A molybdenum ion-imprinted amino-functionalized chitosan adsorbent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 A molybdenum ion-imprinted amino-functionalized chitosan (I-EDA-CS) adsorbent

[0038] The preparation method is as follows:

[0039] 1) Dissolve 2g of solid ammonium molybdate in a mixed solution of water and ethanol (water:ethanol=1:1), stir, and react at 20-25°C for 3h to obtain a colorless transparent liquid;

[0040] 2) Slowly drop 30 mL of ethylenediamine into the colorless transparent liquid, keep stirring at room temperature, and react for 2 hours to obtain solution A, then add 50 mL of epichlorohydrin to solution A, and stir under reflux at 40°C for 12 hours, then Add 25 g of chitosan, continue to stir under reflux for 24 hours at 50 °C, wash with distilled water until neutral, and dry at 50 °C to obtain an intermediate product;

[0041] 3) Remove molybdenum imprinted ions in the intermediate product with HCl of a certain acidity, then wash with distilled water until neutral, and dry to obtain a molybdenum ion imprinted amino-functionalized chitosan ...

Embodiment 2-5

[0043] Example 2-5 A molybdenum ion-imprinted amino-functionalized chitosan (I-EDA-CS) adsorbent

[0044] The preparation method is the same as that of Example 1, except that the addition amount of ammonium molybdate in step 1) is changed by 1g, 3g, 4g, and 5g.

[0045] The I-EDA-CS adsorbents prepared in Examples 1-5 were tested and compared, and the results showed that when the mass ratio of ammonium molybdate to chitosan was 1-3:25, the adsorption rate reached more than 94%.

Embodiment 6

[0046] Example 6 Application and Comparison

[0047] Take the imprinted adsorbent: the I-EDA-CS adsorbent prepared in Example 1.

[0048] Take the unimprinted adsorbent: N-EDA-CS adsorbent. The preparation process of the unimprinted adsorbent is the same as that of the imprinted adsorbent, except that ammonium molybdate is not added in the reaction process, that is, in the reaction process prepared in Example 1, no ammonium molybdate is added. The N-EDA-CS adsorbent was finally obtained by adding ammonium molybdate.

[0049] The I-EDA-CS adsorbent and N-EDA-CS adsorbent were oscillated and adsorbed on a 20ppm rhenium solution with pH=4 with a solid-liquid ratio of 1:1, and oscillated at 303K for 24h. The results are as follows figure 1 As shown, the adsorption efficiency of I-EDA-CS adsorbent for rhenium can reach 94.11%. While the unimprinted N-EDA-CS adsorbent was only 45.7%. The maximum adsorption capacity of I-EDA-CS adsorbent can reach 357.52g / kg, and the maximum adsor...

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Abstract

The invention discloses a molybdenum ion imprinted amino-functionalization chitosan I-EDA-CS adsorbent. A preparation method comprises the following steps: (1) adding an ammonium molybdate solid into a mixed solution of water and ethanol, and stirring for reaction to obtain a colorless transparent liquid; (2) dropwise adding ethylenediamine, continuously stirring at normal temperature, adding epoxy chloropropane, stirring in backflow, adding a proper amount of biomass chitosan, stirring in backflow, washing and drying to obtain an intermediate product; and (3) removing molybdenum imprinted ions from the intermediate product by HCl, washing the intermediate product with distilled water till the product becomes neutral, and drying to obtain molybdenum ion imprinted amino-functionalization chitosan. The preparation method is simple and green and is free of pollution, and the ion imprinted amino-functionalization chitosan adsorbent is high in separation and enrichment efficiency and can be used for selectively adsorbing rhenium from a rhenium contained solution. The preparation method is free of energy consumption, has energy saving and environment protecting effect, and has large adsorbing capacity, wide applicability and practical applicability.

Description

technical field [0001] The invention is applied to the technical field of effective extraction of scattered metals and preparation of green adsorbents, relates to an ion-imprinted amino-functionalized chitosan adsorbent, and aims to selectively recover rhenium from a solution containing rhenium ions and impurity metal ions. Background technique [0002] Rare scattered elements (abbreviated RSE) can also be called rare scattered elements, mainly including: ① gallium; ② indium; ③ germanium; ④ thallium; ⑤ selenium; ⑥ tellurium; ⑦ rhenium. Rhenium is a precious rare metal. It is the rarest metal on earth with high strength, high melting point and excellent ductility, mechanical stability and formability. It is an important emerging metal material today and is widely used in petroleum industry, aerospace industry, automobile industry, electronics Industry and other modern industrial sectors. Most of rhenium exists in copper sulfide ore, molybdenite, rare earth ore and niobium-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/28B01J2220/4881C02F1/286C02F2101/20
Inventor 熊英宋阳娄振宁单炜军
Owner LIAONING UNIVERSITY
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