Construction method and application of interface catalytic oxidation film suitable for algae-water separation

Abstract

The invention belongs to the technical field of membrane filtration, and particularly discloses a construction method and application of an interface catalytic oxidation membrane suitable for algae-water separation. The method comprises the following steps: soaking a polycarbonate membrane in an organic solvent, and continuously soaking the polycarbonate membrane in a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine; after soaking is completed, sequentially soaking the membrane in a polyacrylic acid aqueous solution and a poly (diallyldimethylammonium chloride) aqueous solution and repeating the process with ensuring that the finally used soaking solution is the polyacrylic acid aqueous solution, then soaking the membrane in a ferrous ion solution, then dropwise adding a sodium borohydride aqueous solution to the surface of the membrane, thus producing the interface catalytic oxidation membrane. Nanometer zero-valent iron is loaded on the surface of the interfacecatalytic oxidation film to activate peroxymonosulfate, so that interface catalytic oxidation in the process of filtering algae-containing water is realized. Compared with the traditional in-situ reaction pre-oxidation, the method has the advantages that the rupture rate of algae cells is greatly reduced, so that the water supply safety is better guaranteed.

Description

technical field

[0001] The invention belongs to the technical field of membrane filtration, and in particular relates to a construction method and application of an interface catalytic oxidation membrane suitable for algae-water separation.

[0002] technical background

[0003] Using membrane filtration technology to separate algae cells from water is an important means of treating algae-containing water. However, in the process of applying membrane filtration technology, membrane fouling will inevitably occur, which will greatly reduce the filtration flux and increase unnecessary energy consumption.

[0004] In order to solve the problem of membrane fouling, the method of pre-oxidizing algae-containing water is widely used at present. This method can oxidize the extracellular polymers of algal cells and promote the flocculation of algal cells, thereby forming a looser filter cake layer, thereby increasing the filtration flux. However, common pre-oxidants such as sodium hy...

Examples

Embodiment 1

[0044] Example 1: The preparation of a microfiltration membrane with nanometer zero-valent iron loading is completed in the following steps

[0045] (1) Clean the base film

[0046] Soak the purchased polycarbonate (PC) membrane with an average pore diameter of 0.4 μm in deionized water for 12 hours to obtain Membrane I.

[0047] (2) Coating polydopamine / polypropyleneimine layer

[0048] Soak the membrane I obtained in step (1) with absolute ethanol for 5 minutes, then immerse in the solution I, and vibrate at a speed of 50r / min for 12 hours, take it out and rinse it with deionized water for 5 minutes, and the membrane can be obtained II.

[0049] Solution I in step (2) is a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine, and the pH value of the mixed solution is controlled at 7 with 10 mM Tris-HCl buffer solution. The concentration of dopamine hydrochloride is 1g / L, and the concentration of polyethyleneimine is 1g / L. The water used to configure the...

Embodiment 2

[0058] Embodiment 2: The preparation of microfiltration membrane with nanometer zero valent iron loading is completed according to the following steps

[0059] (1) Clean the base film

[0060] The purchased polycarbonate (PC) membrane with an average pore diameter of 0.4 microns was soaked in deionized water for 24 hours to obtain membrane I.

[0061] (2) Coating polydopamine / polypropyleneimine layer

[0062] Soak the membrane I obtained in step (1) with absolute ethanol for 15 minutes, then immerse in the solution I, and vibrate at a speed of 100r / min for 24 hours, take it out and rinse it with deionized water for 10 minutes, and the membrane can be obtained II.

[0063] Solution I in step (2) is a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine, and the pH value of the mixed solution is controlled at 8 with 50 mM Tris-HCl buffer solution. The concentration of dopamine hydrochloride is 5g / L, and the concentration of polyethyleneimine is 10g / L. The w...

Embodiment 3

[0072] Embodiment 3: the preparation has the microfiltration membrane of nanometer zero-valent iron loading to be finished according to the following steps

[0073] (1) Clean the base film

[0074] The purchased polycarbonate (PC) membrane with an average pore diameter of 0.4 μm was immersed in deionized water for 72 hours to obtain membrane I.

[0075] (2) Coating polydopamine / polypropyleneimine layer

[0076] Soak the membrane I obtained in step (1) with absolute ethanol for 30 minutes, then immerse in the solution I, and vibrate at a speed of 200r / min for 48 hours, take it out and rinse it with deionized water for 20 minutes, and the membrane can be obtained II.

[0077] Solution I in step (2) is a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine, and the pH value of the mixed solution is controlled at 10 with 100 mM Tris-HCl buffer solution. The concentration of dopamine hydrochloride was 10g / L, and the concentration of polyethyleneimine was 15g / L....

technical field

[0001] The invention belongs to the technical field of membrane filtration, and in particular relates to a construction method and application of an interface catalytic oxidation membrane suitable for algae-water separation.

[0002] technical background

[0003] Using membrane filtration technology to separate algae cells from water is an important means of treating algae-containing water. However, in the process of applying membrane filtration technology, membrane fouling will inevitably occur, which will greatly reduce the filtration flux and increase unnecessary energy consumption.

[0004] In order to solve the problem of membrane fouling, the method of pre-oxidizing algae-containing water is widely used at present. This method can oxidize the extracellular polymers of algal cells and promote the flocculation of algal cells, thereby forming a looser filter cake layer, thereby increasing the filtration flux. However, common pre-oxidants such as sodium hy...

Examples

Embodiment 1

[0044] Example 1: The preparation of a microfiltration membrane with nanometer zero-valent iron loading is completed in the following steps

[0045] (1) Clean the base film

[0046] Soak the purchased polycarbonate (PC) membrane with an average pore diameter of 0.4 μm in deionized water for 12 hours to obtain Membrane I.

[0047] (2) Coating polydopamine / polypropyleneimine layer

[0048] Soak the membrane I obtained in step (1) with absolute ethanol for 5 minutes, then immerse in the solution I, and vibrate at a speed of 50r / min for 12 hours, take it out and rinse it with deionized water for 5 minutes, and the membrane can be obtained II.

[0049] Solution I in step (2) is a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine, and the pH value of the mixed solution is controlled at 7 with 10 mM Tris-HCl buffer solution. The concentration of dopamine hydrochloride is 1g / L, and the concentration of polyethyleneimine is 1g / L. The water used to configure the...

Embodiment 2

[0058] Embodiment 2: The preparation of microfiltration membrane with nanometer zero valent iron loading is completed according to the following steps

[0059] (1) Clean the base film

[0060] The purchased polycarbonate (PC) membrane with an average pore diameter of 0.4 microns was soaked in deionized water for 24 hours to obtain membrane I.

[0061] (2) Coating polydopamine / polypropyleneimine layer

[0062] Soak the membrane I obtained in step (1) with absolute ethanol for 15 minutes, then immerse in the solution I, and vibrate at a speed of 100r / min for 24 hours, take it out and rinse it with deionized water for 10 minutes, and the membrane can be obtained II.

[0063] Solution I in step (2) is a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine, and the pH value of the mixed solution is controlled at 8 with 50 mM Tris-HCl buffer solution. The concentration of dopamine hydrochloride is 5g / L, and the concentration of polyethyleneimine is 10g / L. The w...

Embodiment 3

[0072] Embodiment 3: the preparation has the microfiltration membrane of nanometer zero-valent iron loading to be finished according to the following steps

[0073] (1) Clean the base film

[0074] The purchased polycarbonate (PC) membrane with an average pore diameter of 0.4 μm was immersed in deionized water for 72 hours to obtain membrane I.

[0075] (2) Coating polydopamine / polypropyleneimine layer

[0076] Soak the membrane I obtained in step (1) with absolute ethanol for 30 minutes, then immerse in the solution I, and vibrate at a speed of 200r / min for 48 hours, take it out and rinse it with deionized water for 20 minutes, and the membrane can be obtained II.

[0077] Solution I in step (2) is a mixed aqueous solution of dopamine hydrochloride and polyethyleneimine, and the pH value of the mixed solution is controlled at 10 with 100 mM Tris-HCl buffer solution. The concentration of dopamine hydrochloride was 10g / L, and the concentration of polyethyleneimine was 15g / L....

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