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Agent and method for surface treatment on nanofiltration membrane

A surface treatment agent, nanofiltration membrane technology, applied in osmosis/dialysis water/sewage treatment, general water supply conservation, reverse osmosis, etc., can solve the problem of high nanofiltration membrane removal rate, membrane surface easily polluted membrane flux, etc. problems, to achieve the effect of strong practicability, low equipment requirements, and promotion of improvement

Active Publication Date: 2015-04-22
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a surface treatment agent and a surface treatment method for a nanofiltration membrane, which solves the problem that the removal rate of the nanofiltration membrane is high, the membrane surface is easily polluted, and the membrane flux is low

Method used

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  • Agent and method for surface treatment on nanofiltration membrane
  • Agent and method for surface treatment on nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Disperse 50g of titanium dioxide nanoparticles (60nm in particle size) in 4900g of deionized water, stir well and disperse evenly at 20°C, add 50g of ethanolamine, stir for 1 hour, and prepare a surface treatment agent. Take the 20cm×20cm size VNF1 nanofiltration membrane and soak it in the suspension, take it out after 0.1min, use an air knife to remove the residual solution on the surface, and then heat-treat it in an oven at 80°C. After the treatment time is 10min, the nanofiltration membrane modified by nanoparticles membrane.

Embodiment 2

[0024] Dissolve 100g of alumina nanoparticles (particle size 500nm) in 4900g of ethanol, stir well and disperse evenly at 25°C, add 50g of phosphoethanolamine, stir for 3 hours, and prepare a surface treatment agent. Take a 20cm×20cm size VNF1 nanofiltration membrane and soak it in the ethylene glycol amine solution, take it out after 4 minutes, remove the residual solution on the surface with an air knife, and then heat-treat it in a 60°C oven. After 30 minutes of treatment, you can get the ethylene glycol amine modification. after the nanofiltration membrane.

Embodiment 3

[0026] Disperse 50g of silica nanoparticles (particle size: 200nm) in 4850g of methanol, stir well and disperse evenly at 30°C, add 100g of dimethylethanolamine into the suspension, stir for 57h, and prepare a surface treatment agent. Take the 20cm×20cm size VNF1 nanofiltration membrane and soak it in the suspension, take it out after 8 minutes, remove the residual solution on the surface with an air knife, and then heat-treat it in a 40°C oven. membrane.

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Abstract

The invention provides an agent and a method for surface treatment on a nanofiltration membrane. The agent for surface treatment comprises 0.01 to 10wt% of antibacterial nano-particles, 0.1 to 30wt% of one or more active agents and the balance one or more solvents. A preparation method of the agent comprises the following steps of dispersing the antibacterial nano-particles in the one or more solvents, stirring at a temperature of 20 to 40 DEG C until uniform dispersion, adding the one or more active agents into the mixed solution, and stirring for 1 to 10 hours until dissolution to obtain the agent for surface treatment on a nanofiltration membrane. The method for surface treatment on a nanofiltration membrane comprises the following steps of 1, coating or dipping of the agent for surface treatment on a nanofiltration membrane, 2, air-knife surface drying, and 3, drying in an oven. The agent and the method for surface treatment on a nanofiltration membrane have the advantages that a high desalinization rate is maintained and a nanofiltration membrane treated by the agent and the method has high flux under low pressure so that a nanofiltration membrane product having excellent flux performances and good desalination effects is obtained. The agent has high efficiency, can be operated easily, and has low equipment requirements and strong practicality.

Description

technical field [0001] The invention relates to a surface treatment agent and a surface treatment method of a nanofiltration membrane, belonging to the field of water treatment. Background technique [0002] Nanofiltration membranes are extremely susceptible to organic fouling, and their surface charge, hydrophobicity, roughness and other characteristics have a major impact on the organic adsorption fouling and clogging of the membrane. On the one hand, the adsorption of polar organic substances on the surface of nanofiltration membranes may be carried out by hydrogen bonding, dispersion force adsorption, and hydrophobic interactions; the formation of these surfactant adsorption layers requires a higher consumption of water molecules to pass through the membrane. energy; it is precisely because of this increased activation energy that ultimately leads to a decrease in water production. On the other hand, the interaction between hydrophobic organics and water enriches these ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02C02F1/44
CPCY02A20/131
Inventor 梁松苗吴宗策金焱许国扬陶健蔡志奇
Owner VONTRON TECH CO LTD
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