Method used for improving organic nanofiltration membrane separating property

A separation performance, nanofiltration membrane technology, applied in the field of membrane separation

Inactive Publication Date: 2012-10-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent CN1287381A, it involves an optical system and a laser heat treatment device for laser heat treatment, expounds the principle of the light heat ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The feed liquid adopted is: pure water, isopropanol, bromothymol blue ethanol solution. In the glass filter device, the nano-inorganic-cellulose acetate composite nanofiltration flat wet film with a gold content of 0.44wt% and a nano-gold size of 20-30nm is attached to the insulating surface and sealed with a sealing ring. There is a transparent glass window on the top of the filter device, so that the continuous argon ion laser beam (wavelength of 514nm) can be irradiated on the upper surface of the membrane. Adjust the laser intensity to 0.2W / cm by adjusting the laser power and the distance between the laser beam emitting end and the film surface 2 , so that the temperature of the membrane reaches 42 °C. The average water flux measured was 0.38 (Lm -2 bar -1 h -1 ), the average flux of isopropanol is 0.30 (Lm -2 bar -1 h -1 ), the average rejection rate of bromothymol blue (BTB, 35 microns, 632 g / mol) was 80.5%.

[0025] The average value of water flux without...

Embodiment 2

[0027] The feed liquid that adopts is isopropanol, bromothymol blue ethanol solution. In the glass filter device, the nano-silver-polyimide nanofiltration flat membrane with a silver content of 0.1wt% and a nano-silver size of 70-80nm is attached to the insulating surface and sealed with a fluororubber O-ring. There is a transparent glass window on the top of the device, which can irradiate the continuous argon ion laser beam (wavelength 425nm) on the membrane surface through mirror reflection. Adjust the laser intensity to 0.13W / cm by adjusting different powers and different distances between the laser beam passing through the lens and the film surface 2 , bring the membrane to 36 °C. The measured flux of isopropanol is 0.25 (Lm -2 bar -1 h -1 ). The average rejection of bromothymol blue (BTB, 35 microns, 632 g / mol) was 82.7%.

[0028] The flux of isopropanol without laser irradiation is 0.21 (Lm -2 bar -1 h -1 ). The average rejection rate of bromothymol blue was ...

Embodiment 3

[0030] The feed liquid that adopts is isopropanol, bromothymol blue ethanol solution. In a specific glass filter device, a nano-gold-polyimide composite nanofiltration flat membrane with a gold content of 0.2wt% and a nano-gold size of 20-30nm is attached to the insulating surface, and a fluororubber O-ring is used to seal the membrane. seal. There is a transparent glass window on the top of the device, which can irradiate the continuous argon ion laser beam (wavelength: 514nm) on the membrane surface through mirror reflection. Adjust the laser intensity to 0.16W / cm by adjusting different powers and different distances between the laser beam passing through the lens and the film surface 2 , bring the film to 40 °C. The measured flux of isopropanol is 0.28 (Lm -2 bar -1 h -1 ), the average rejection rate of bromothymol blue (BTB, 35 microns, 632 g / mol) was 84.3%.

[0031] The flux of isopropanol without laser irradiation is 0.22 (Lm -2 bar -1 h -1 ), the average reject...

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Abstract

The invention relates to a method used for improving an organic nanofiltration membrane separating property, and belongs to the technical field of membrane separation. Aiming at the limitation in a membrane separating technology, the invention provides a method for improving organic nanofiltration membrane separating property by utilizing the photo-thermal effect of a metal nano particle. According to the method, laser is used for irradiating the upper surface of a nanometer inorganic-inorganic compound nanofiltration membrane during filtering, and the part of a filter unit between a laser transmitting terminal and the nanometer inorganic-inorganic compound nanofiltration membrane is made of transparent material, so that laser can pass through the filter unit to irradiate the upper surface of the nanometer inorganic-inorganic compound nanofiltration membrane. According to the invention, the improvement of the separating property of the membrane is caused by temperature increment of the membrane and does not derive from the modification of any membrane or the formation of membrane holes, so that the membrane flux of the organic nano filter membrane can be greatly improved under the condition that the retention rate is not obviously changed, and an 'inverse effect' of the membrane flux and the retention rate is overcome.

Description

technical field [0001] The invention relates to a method for improving the separation performance of an organic nanofiltration membrane, which belongs to the technical field of membrane separation. Background technique [0002] Membrane separation technology is an emerging discipline produced by the cross-combination and interpenetration of many disciplines such as materials, chemical engineering and process engineering. It is an important high-tech solution to contemporary energy, resource and environmental problems. The application of nano-inorganic-organic composite membranes in membrane separation technology is particularly prominent. Because nanoparticles have the characteristics of large specific surface area, highly activated surface active atoms, and strong interfacial interaction with polymers, using inorganic nanoparticles as a reinforcing phase to uniformly disperse them in the organic host phase can improve the interaction with the matrix. The interface is bonde...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12
Inventor 李平赵乾
Owner UNIV OF JINAN
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