Preparation of a hybrid membrane for the selective separation of copper from mixed metal solutions

A mixed metal, selective technology, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the difficulty of separating and grading mixed heavy metal ion solutions, and cannot selectively separate copper ions. Application Value is limited and other problems, to achieve the effect of increasing adsorption and removal capacity, less steps, and eliminating pollution

Active Publication Date: 2022-05-10
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent 201210539883.4 proposes a method for the preparation of a linear amino molecule-modified graphene oxide adsorption material. This method uses graphite powder as a raw material and prepares graphene oxide through the oxidation of concentrated sulfuric acid, potassium permanganate, and peroxide water. , dissolve graphene oxide in ethanol, ultrasonically make it well dispersed in ethanol, then add a certain amount of linear molecules containing ammonia functional groups, and react in a water bath at 50-80°C for 12-24 hours to obtain the product Wash with ethanol after decompression suction filtration, dry at 50~100 ℃, can obtain heavy metal adsorption material; This adsorbent has good adsorption to lead ion, cadmium ion, manganese ion, copper ion, but this method It adsorbs a single heavy metal ion, which is not selective. It is difficult to separate and grade mixed heavy metal ion solutions, and its application value is limited.
[0004] Chinese patent 201210539875.X proposes the preparation of graphene oxide adsorption material based on dendritic polymer modification. The graphene oxide adsorption material prepared by dendritic polymer modification Chinese patent 201210539883.4 is used to adsorb lead ions and cadmium in wastewater. ions, manganese ions, copper ions and other heavy metal ions; however, this method adsorbs a single heavy metal ion, which is not selective, and it is difficult to separate and grade mixed heavy metal ion solutions, and its application value is limited
However, it is not selective and cannot selectively separate copper ions from mixed heavy metal ion solutions

Method used

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  • Preparation of a hybrid membrane for the selective separation of copper from mixed metal solutions
  • Preparation of a hybrid membrane for the selective separation of copper from mixed metal solutions
  • Preparation of a hybrid membrane for the selective separation of copper from mixed metal solutions

Examples

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Embodiment 1

[0038] A method for preparing a hybrid membrane for selectively separating copper from a mixed metal solution, the preparation steps of which are as follows:

[0039] (1) The preparation of the PVA aqueous solution of 5% (mass ratio): in the 250mL container that agitator is housed, add 25g average degree of polymerization and be the polyvinyl alcohol (PVA) of 1750 ± 50, add appropriate amount of deionized water again, constantly Stir the mixture of PVA and water in the container until the PVA is completely dissolved, continue to stir for 2 hours to obtain a solution, then transfer the solution to a 500mL volumetric flask, add a certain amount of deionized water, shake evenly, and then add an appropriate amount of deionized water Until the solution reaches the full scale of the volumetric flask, shake it evenly to prepare 500mL of PVA aqueous solution with a concentration of 5% by mass.

[0040] (2) Preparation of the hybrid precursor: under the temperature condition of 20°C (u...

Embodiment 2

[0044] Using the same experimental device and operating steps as in Example 1, changing the material ratio, and adding different amounts of silane coupling agent KH-792 to the GO solution, a series of hybrids without supports with different silicon contents can be prepared. film. Among them, the mixture mass ratio (mg / mg) of graphene oxide and silane coupling agent KH-792 is GO:KH-792=150:50, which is marked as hybrid film sample A; graphene oxide and silane coupling agent KH- The mass ratio (mg / mg) of 792 is GO:KH-792=100:100, which is marked as hybrid film sample B; the mass ratio (mg / mg) of the mixture of graphene oxide and silane coupling agent KH-792 is GO: KH-792=50:150 is marked as hybrid membrane sample C.

[0045] The three kinds of hybrid film samples prepared above were mixed with pure GO-doped PVA film (that is, the film prepared by adding pure GO to 5% PVA solution), pure KH-792-doped PVA film (that is, pure KH-792 is added to the film prepared in 5% PVA solutio...

Embodiment 3

[0050] Select the pure GO-doped PVA film prepared in Example 2 and the hybrid film sample B with the best adsorption effect on copper ions, and observe their effect on Cu in the mixed aqueous solution of metal ions. 2+ 、Co 2+ and Ni 2+ SEM morphology of the surface after adsorption, and use energy spectrum to verify; see if heavy metal ions are adsorbed on the surface of the hybrid membrane.

[0051] figure 2 Adsorption of Cu for the hybrid film sample B in Example 2 2+ 、Co 2+ and Ni 2+ SEM image (a) and EDS energy spectrum (b) of the surface after mixing metal ions. image 3 For pure GO doped PVA film adsorption Cu in embodiment 2 2+ 、Co 2+ and Ni 2+ SEM image (a) and EDS energy spectrum (b) of the surface after mixing metal ions. Compare figure 2 and image 3 As can be seen: figure 2 On the EDS energy spectrum of EDS, there is a relatively obvious Cu element peak with the strongest intensity, and the Co element peak is weaker, indicating that the copper conten...

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Abstract

The invention discloses a method for preparing a hybrid film for selectively separating copper from a mixed metal solution. In an inert atmosphere or air, graphene oxide and silane coupling agent KH-792 are reacted through sol-gel Prepare a hybrid precursor, add the obtained hybrid precursor to an aqueous solution of polyvinyl alcohol for reaction, and obtain a coating solution after standing for defoaming, and then coat the coating solution on a support to obtain Diaphragm; it is also possible to dissolve the coating liquid with a solvent first, and then coat the film to obtain a diaphragm. After drying, a hybrid membrane that can be used to selectively separate copper from a mixed metal ion solution can be obtained, and it can have a support or not; It has strong selective adsorption performance, adopts hybrid membrane adsorption method to preferentially remove copper ions in mixed metal ion solutions, and can be used for fractional separation and purification of copper ions in mixed wastewater solutions containing various metal ions.

Description

technical field [0001] The invention belongs to the technical field of heavy metal wastewater treatment, and in particular relates to a method for preparing a hybrid membrane for selective adsorption and separation of copper from a mixed metal solution by using a sol-gel reaction. Background technique [0002] Heavy metal pollution is a worldwide problem, which has attracted more and more attention. Finding a suitable method to remove heavy metal ions in water and eliminate their harm is a key technical issue in the field of water treatment. In particular, with the widespread use of new energy batteries, a large amount of mixed wastewater containing various metal ions will be produced in the recycling process of waste new energy batteries. How to deal with these mixed wastewater containing multiple metal ions has become an urgent need in the development of new energy batteries. Solved technical problems. Since this type of wastewater contains a variety of heavy metal ions,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/22B01J20/265B01J20/28033C02F1/288C02F2101/20
Inventor 刘俊生窦卫军庞博文胡科研李萌
Owner HEFEI UNIV
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