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A preparation method of graphene oxide hybrid membrane for removing copper ions in water

A copper ion and water removal technology, applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of poor temperature resistance of adsorption materials, difficult residue recovery, limited application value, etc., and achieve adsorption The effect of large amount, elimination of heavy metal copper ion pollution, and adjustable adsorption performance

Active Publication Date: 2021-12-07
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] 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 After vacuum filtration, washing with ethanol, and drying at 50-100°C, the heavy metal adsorption material can be obtained; this method has the disadvantages of many reaction steps, complicated procedures, difficult residue recovery, and poor temperature resistance of the adsorption material. Its application value is limited
[0003] 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; this method also has the disadvantages of many reaction steps, complicated procedures, difficulty in residue recovery, and poor temperature resistance of adsorption materials, so its application value is limited.
[0004] Chinese patent 201510567081.8 proposes a method for preparing a graphene oxide adsorption material that adsorbs copper ions. Using water as a solvent, graphene oxide is grafted with triethylenetetramine and modified with potassium cyanate to obtain a multi-adsorption Site of solid copper ion adsorption material, this method has many reaction steps, complex procedures, difficulty in residue recovery, and poor temperature resistance of the adsorption material, its application value is limited

Method used

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  • A preparation method of graphene oxide hybrid membrane for removing copper ions in water
  • A preparation method of graphene oxide hybrid membrane for removing copper ions in water
  • A preparation method of graphene oxide hybrid membrane for removing copper ions in water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for removing a graphene oxide hybrid membrane of copper ions in water, the preparation steps of which are as follows:

[0037](1) The preparation of the PVA aqueous solution of 3% (mass ratio): in the 250mL container that agitator is equipped with, add 15g average degree of polymerization and be the polyvinyl alcohol (PVA) of 1750 ± 50, add appropriate deionized water again, in In the air, under the temperature condition of 75°C, keep stirring the mixture of PVA and water in the container until the PVA is completely dissolved, continue to stir for 3 hours to obtain a solution, transfer the solution to a 500mL volumetric flask after cooling, add a certain amount of deionized water, oscillate evenly, and then add an appropriate amount of deionized water until the solution reaches the full scale of the volumetric flask, and then oscillate evenly to prepare 500mL of PVA aqueous solution with a concentration of 3% by mass.

[0038] (2) Preparation of silane coupling...

Embodiment 2

[0042] Using the same experimental device and operating steps as in Example 1, changing the material ratio, and adding different amounts of silane coupling agent mixtures to the GO solution, a series of graphene oxide without supports with different silicon contents can be prepared. hybrid film. Among them, the mass ratio of graphene oxide and silane coupling agent mixture is GO:KH-792:WD-60=0.1:0.1:0.05, which is labeled as graphene oxide hybrid film GO-Si-A; graphene oxide and silane coupling agent The mass ratio of the coupling agent is GO:KH-792:WD-60=0.1:0.1:0.1, which is marked as graphene oxide hybrid film GO-Si-B; the mass ratio of graphene oxide and silane coupling agent mixture is GO: KH-792:WD-60=0.1:0.1:0.2 is marked as graphene oxide hybrid film GO-Si-C.

[0043] The three kinds of graphene oxide hybrid membranes prepared above were put into 20mg / L copper ion solution respectively to carry out adsorption and removal of copper ion (Cu 2+ ), the experimental proce...

Embodiment 3

[0048] Using the same experimental device and operating steps as in Example 2, the graphene oxide hybrid film GO-Si-B with the best adsorption effect is selected to adsorb copper ions, and the experimental condition parameters are optimized. The specific experimental process is as follows:

[0049] (1) Effect of adsorption time on the amount of copper ion adsorption

[0050] Select 20mg of graphene oxide hybrid film GO-Si-B, under the condition of pH=4, for 30mL of CuSO with a concentration of 20mg / L 4 The solution was adsorbed, and the influence of the adsorption time on the adsorption amount of copper ions was examined, and the adsorption time was respectively taken as 0, 3, 6, 9, 12, 15, 18, 21, and 24 hours, and the adsorption amount of copper ions was measured. Experimental results such as figure 2 as shown ( figure 2 The adsorption time in English is written as Contact time), by figure 2 It can be seen that the adsorption of copper ions reaches saturation at 9 h, s...

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Abstract

The invention discloses a method for preparing a graphene oxide hybrid film for removing copper ions in water. In an inert atmosphere or air, the sol between the graphene oxide and the silane coupling agent KH-792 and WD-60 mixture is prepared. ‑Gel reaction to prepare a hybrid precursor, adding the obtained hybrid precursor to an aqueous solution of polyvinyl alcohol for reaction, the obtained material is allowed to stand for defoaming to obtain a coating solution, and then the coating solution is placed on the support The film is coated to obtain a diaphragm; the coating liquid can also be dissolved in a solvent first, and then the film is coated to obtain a diaphragm. After drying, the graphene oxide hybrid membrane that can be used to remove copper ions in water can be obtained. It can have a support or not; it has a strong adsorption capacity for copper ions in water, and can be separated by adsorption method to remove copper ions from water. The hybrid membrane has large adsorption capacity for copper ions, high removal efficiency, fast speed and adjustable adsorption performance, and can be used for adsorption and removal of copper ions in copper-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for preparing a graphene oxide hybrid membrane for removing copper ions in water by using a sol-gel reaction. Background technique [0002] 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 After vacuum filtration, washing with ethanol, and drying at 50-100°C, the heavy metal adsorption material can be obtained; this method has the disadvantages of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C02F1/283C02F2101/20
Inventor 刘俊生王凤侠武德伟梁黎明窦卫军
Owner HEFEI UNIV
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