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High salinity wastewater treatment corrosion-resistant anti-fouling membrane as well as preparation method and application thereof

A high-salt wastewater, anti-fouling membrane technology, applied in osmosis/dialysis water/sewage treatment, chemical instruments and methods, membranes, etc., can solve the problem that clay particles are not easy to bond with membrane materials, nanomaterials are easy to fall off, and membranes lose excellent performance. and other problems, to achieve the effect of good mechanical properties, simple and easy operation, and stable properties.

Active Publication Date: 2018-02-23
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a technique of modifying clay particles, but clay particles are not easy to combine with membrane materials, so the preparation conditions are difficult to control and the membrane properties are unstable
Moreover, in the process of use, the nanomaterials are easy to fall off, which makes the film lose its excellent performance.
[0004] Oceanic nodule minerals are a kind of ores rich in manganese or cobalt that are commonly found on the seabed. They are stable in high salt water and have certain antibacterial properties. However, there are no reports on the preparation of membrane materials by doping such minerals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Add 50g of nano-based montmorillonite and 10g of oceanic cobalt-rich nodules (about 0.6% cobalt content) into 1000ml of deionized water, ultrasonically disperse at room temperature for 30min, and mechanically stir for 24h to obtain an inorganic nanoparticle solution; 1g of dopamine hydrochloride and 10ml of 1M / L Tris-HCl buffer solution, adjust the pH to 8.5. At room temperature, mechanically stir for 36 hours, centrifuge at 7500 rpm for 30 minutes after stirring, and collect the precipitate. Afterwards, centrifuge at 7500 rpm for 30 min, wash with deionized water, and centrifuge repeatedly for 5 times. The collected product is dried to a constant weight in a vacuum drying oven to obtain a polydopamine-modified nanoparticle powder;

[0053] (2) Weigh PVDF18%, DMAc80% and 2% of the polydopamine-modified nanoparticle powder obtained above, mix them, and stir at room temperature-70°C for 24h to form a uniform casting solution;

[0054] (3) After standing for 24 hours...

Embodiment 2

[0057] The difference from Example 1 is:

[0058] (1) Add 60g of kaolin and 5g of oceanic manganese-rich nodules into 1500ml of deionized water, ultrasonically disperse at room temperature for 15min, and mechanically stir for 24h to obtain an inorganic nanoparticle solution; add 2g of dopamine hydrochloride and 1M / L of Tris- HCl buffer solution 150ml, adjust the pH to 9.5. Stir mechanically for 36 hours at room temperature; centrifuge after stirring, collect the precipitate, wash the obtained precipitate with acetone, wash with acetone, and centrifuge repeatedly for 3 times, then wash the precipitate with deionized water, and centrifuge after washing. Washing with deionized water and centrifugation were repeated 6 times. The collected product is dried to a constant weight in a vacuum drying oven to obtain a polydopamine-modified nanoparticle powder;

[0059] (2) Take PVDF15%, PVP1%, DMSO83% and polydopamine-modified nanoparticle powder 1% respectively by mass, mix, and stir ...

Embodiment 3

[0063] The difference from Example 1 is:

[0064] (1) Add 30g halloysite and 15g oceanic polymetallic nodules into 1000ml of deionized water, ultrasonically disperse at room temperature for 20 minutes, and mechanically stir for 30 minutes to obtain an inorganic nanoparticle solution; add 2.5g dopamine hydrochloride and 0.5M / L of Tris-HCl buffer solution 100ml, adjust the pH to 10. Stir mechanically for 48 hours at room temperature; centrifuge after stirring, collect the precipitate, wash the obtained precipitate with acetone, wash with acetone, and centrifuge repeatedly for 3 times, then wash the precipitate with deionized water, and centrifuge after washing. Washing with deionized water and centrifugation were repeated 5 times. The collected product is dried to a constant weight in a vacuum drying oven to obtain a polydopamine-modified nanoparticle powder;

[0065] (2) Take PVDF17%, PEG2%, NMP80% and polydopamine-modified nanoparticle powder 1% respectively by mass, mix, a...

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Abstract

The invention relates to a method of the technical field of environment protection and in particular to a high salinity wastewater treatment corrosion-resistant anti-fouling membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: by taking a mixture of clay minerals and oceanic nodule minerals as inorganic nano particles, modifying the inorganic nano particles with dopamine, and combining a PVDF (Polyvinylidene Fluoride) polymer with the nano particles, thereby obtaining the high salinity wastewater treatment corrosion-resistant anti-fouling membrane. The invention aims to improve the water flux, the corrosion resistance and the pollution resistance of the membrane, the mixture of the clay minerals and the oceanic nodule minerals is adopted as the inorganic nano particles, the inorganic nano particles are subjected to surface modification with dopamine, combination of the nano particles and the PVDF is promoted, the obtained membrane is capable of efficiently treating high salinity wastewater and meanwhile has properties of corrosion and fouling resistance; in addition, the dopamine has a great amount of hydrophilic groups of amino, particle aggregation is prevented, the hydrophilcity of the membrane is improved, and the difficulties that materials are not uniformly dispersed and are easily dropped off in the use process are solved.

Description

technical field [0001] The invention relates to a method in the technical field of environmental protection, in particular to a corrosion-resistant and anti-fouling membrane for high-salt wastewater treatment, a preparation method and application thereof. Background technique [0002] With the rapid development of the coastal economy, the discharge of coastal high-salt wastewater is increasing day by day, which has led to the imbalance of the coastal sea ecosystem, frequent red tides, and the breeding of diseases. The environmental problems caused by high-salt wastewater discharge have attracted more and more attention. There are many types of pollutants in high-salt wastewater, and the system is complex. In addition, due to the high salinity and chloride ion content of high-salt wastewater, it is highly corrosive and difficult to treat. In recent years, membrane separation technology, as a new type of water treatment process, has developed rapidly in the treatment of refrac...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D69/06B01D69/08B01D71/34C02F1/44
CPCB01D67/0079B01D69/02B01D69/06B01D69/08B01D71/34B01D2325/30C02F1/44
Inventor 吕剑蔡颖武君骆永明
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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