Method for determining ultramicro filter membrane pore size and pore size distribution

A technology of ultra-microfiltration membrane and pore size distribution, which is applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc. It can solve the problems of inability to accurately detect effective pores, complex devices and operations, and difficult pressure, so as to achieve the goal of not being easily deformed , easy to operate, accurate measurement of the effect

Active Publication Date: 2017-06-13
RENMIN UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Permeation porosimetry can detect the effective pores of the membrane, but the device and operation are more complicated, and it is difficult to keep the pressure on both sides of the membrane the same.
Holes measured by thermal porosimetry include dead-end holes, which cannot accurately detect effective holes
The molecular weight cut-off method is suitable for the determinati

Method used

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  • Method for determining ultramicro filter membrane pore size and pore size distribution
  • Method for determining ultramicro filter membrane pore size and pore size distribution
  • Method for determining ultramicro filter membrane pore size and pore size distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Use a dynamic light scattering instrument to characterize the particle size distribution and average particle size of newly purchased polystyrene nanoparticles, and select polystyrene nanoparticles with a single peak distribution curve and a relatively concentrated particle size distribution as a reference.

[0036]2. Use UV spectrophotometer to scan the absorbance of polystyrene nanoparticles of each particle size between 200-900nm, detect that the maximum absorption wavelength of polystyrene nanoparticles used is 220nm, and make a test at the maximum absorption wavelength. Standard curve for nanoparticles of this particle size.

[0037] 3. Replace the sample cell 2 in the test device with an ultrafiltration cup, put the PES material flat diaphragm into the ultrafiltration cup, and connect the rest of the test device to start the test:

[0038] Firstly, a 30min ultrapure water filtration experiment was carried out under the pressure of 0.1MPa, mainly to wash the fla...

Embodiment 2

[0050] Step 1 and step 2 of this embodiment are exactly the same as step 1 and step 2 of embodiment 1, the difference is step 3, specifically:

[0051] 3. The hollow fiber membrane of PVDF material is packaged into a membrane module, and the test device is connected, and the test is started. According to the same test process as step 3 of embodiment 1, the retention rate data obtained are as shown in table 2:

[0052] Table 2

[0053]

[0054] According to the average particle diameter measured by the dynamic light scattering instrument in Table 2 and the interception rate of the corresponding particle size interception experiment, calculate the corresponding particle diameter when the interception rate is 50% and 90%, and the geometric mean pore diameter d 50 =198.55nm, nominal aperture d 90 =287.55nm, and obtain the pore size distribution according to the pore size distribution formula, such as image 3 shown.

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Abstract

The invention relates to a method for determining ultramicro filter membrane pore size and pore size distribution. The method comprises the following steps: 1) selecting a primary standard substance; 2) scanning maximum absorption wavelengths of nanoparticles with various particle sizes in an ultraviolet-visible wavelength range, and accordingly drawing a standard curve under the maximum absorption wavelengths; 3) selecting polystyrene nanoparticles with single particle size and preparing into solution with mass concentration of C0, uniformly dispersing the nanoparticles with the particle size in water by adopting ultrasound, carrying out a filtration experiment on an ultramicro filter membrane by adopting a suspension liquid filtration method, selecting filtered solution, determining absorbance of the polystyrene nanoparticles with the particle size under the maximum absorption wavelength, calculating concentration Ct of the nanoparticles with the particle size in the filtered solution by adopting a standard curve, and further calculating retention rate R of the ultramicro filter membrane on the polystyrene nanoparticles on the polystyrene nanoparticles with the particle size; and 4) selecting the polystyrene nanoparticles with different particle sizes, repeating the step 3), retaining, and calculating membrane pore diameter of the ultramicro filter membrane according to the determined retention rate. The method provided by the invention is simple in principle and easy to operate and can determine the ultramicro filter membrane pore size and the pore size distribution more accurately.

Description

technical field [0001] The invention relates to a method for measuring the pore size and pore size distribution of an ultramicrofiltration membrane. Background technique [0002] Membrane pore size refers to the channel diameter at the narrowest part of the pores running through the entire membrane surface, and the membrane pores of a specific membrane are not uniform in size, but have a certain pore size distribution. Membrane pore size is often expressed by maximum pore size, average pore size and pore size distribution. The nominal pore size and absolute pore size are also used to indicate the membrane pore size. The nominal pore size means that particles or molecules of this size are intercepted by a certain percentage (90% or 95%). The absolute pore size refers to the largest pore size or particle size equal to or greater than the membrane. were all detained. The geometric mean pore size refers to the most distributed pores, and when the pore size is normally distribu...

Claims

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Application Information

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IPC IPC(8): B01D65/10
CPCB01D65/10
Inventor 郑祥刘丽罗鸣程荣尚闽
Owner RENMIN UNIVERSITY OF CHINA
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