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A high-adsorption porous composite film used for adsorbing PM2.5

A composite film, high adsorption technology, used in conjugated synthetic polymer man-made filaments, separation methods, dispersed particle separation and other directions, can solve the problems of single structural unit, limited function and other problems, achieve large specific surface area and improved mechanical properties , the effect of high porosity

Active Publication Date: 2017-07-28
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the relatively single structural unit of ZIFs crystal materials, its function is limited (Li Rui, Construction and functional properties of metal organic frameworks and their derivative structures [D]. Beijing Institute of Technology, 2014: 1-5.)

Method used

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  • A high-adsorption porous composite film used for adsorbing PM2.5

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 13.10 mg of ZIF-8 and dissolve it in 10 mL of dichloromethane, ultrasonically disperse for 30 min, add 1.297 g of polylactic acid (ZIF-8: polylactic acid = 1:99), stir magnetically for 3 h to fully dissolve, and obtain the electrospun liquid. The electrospinning solution was electrospun with an electrospinning device at a temperature of 20°C and a relative humidity of 50%. Porous composite film. figure 1 (b1) and (b2) are SEM images of PLA: ZIF-8 electrospun fiber membranes with a ratio of 99:1. It can be seen that the polylactic acid electrospun fiber membranes under this condition have a porous structure. The mechanical performance test is carried out by a microcomputer-controlled electronic universal testing machine. The mechanical performance test results: the tensile strength is 1.81MPa, and the elongation at break is 60.12%. The adsorption efficiency is defined as the ratio of the mass of PM2.5 adsorbed by the film to the mass of the film in ten minutes, a...

Embodiment 2

[0031] Weigh 36.13mg of ZIF-8 and dissolve it in 10mL of dichloromethane, ultrasonically disperse for 30min, add 1.7707g of polylactic acid (ZIF-8: polylactic acid = 2:98), stir magnetically for 3h to fully dissolve, and obtain the electrospun liquid. Use an electrospinning device to electrospin the electrospinning solution at a temperature of 25°C and a relative humidity of 60%, set the voltage at 25KV, propel the spinning solution at a speed of 1mL / h, and receive a distance of 20cm to obtain porous composite film. figure 1 (c1) and (c2) are SEM images of PLA:ZIF-8 electrospun fiber membranes with a ratio of 98:2. It can be seen that the polylactic acid electrospun fiber membranes under this condition have a porous structure. The mechanical performance test is carried out by a microcomputer-controlled electronic universal testing machine. The mechanical performance test results: the tensile strength is 2.86MPa, and the elongation at break is 100.51%. The ratio of the mass o...

Embodiment 3

[0033] Weigh 44.17 mg of ZIF-8 and dissolve it in 10 mL of dichloromethane, ultrasonically disperse for 30 min, add 1.4280 g of polylactic acid (ZIF-8: polylactic acid = 3:97), stir magnetically for 4 h to fully dissolve, and obtain an electrospinning solution . The electrospinning solution was electrospun with an electrospinning device at a temperature of 30°C and a relative humidity of 60%. The voltage was set at 23KV, the advancing speed of the spinning solution was 0.1mL / h, and the receiving distance was 23cm. Porous composite film. figure 1(d1) and (d2) are SEM images of PLA: ZIF-8 electrospun fiber membranes with a ratio of 97:3. It can be seen that the polylactic acid electrospun fiber membranes under this condition have a porous structure. The mechanical performance test is carried out by a microcomputer-controlled electronic universal testing machine. The mechanical performance test results: the tensile strength is 1.80MPa, and the elongation at break is 71.52%. The...

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Abstract

The invention provides a high-adsorption porous composite film used for adsorbing PM2.5. The porous composite film is formed from polylactic acid matrix resin and a zeolite imidazate skeleton at a mass ratio of (99-95): (1-5). A solution mixing method is adopted; polyactic acid and dichloromethane dispersion liquid of ZIF-8 are mixed at a ratio and electrostatic spinning is performed in an environment with a temperature not less than 20 DEG C and a relative humidity not less than 50%, so that the film is obtained. The high-adsorption porous composite film has the advantages of simple manufacturing method, low cost, and environmental protection. The adsorption of the porous composite film is remarkably improved and the film can effectively adsorb PM2.5; the mass of PM2.5 adsorbed by the film for 10 minutes can reach 35.5% of the mass of the film at most; the mechanical property is improved so that the practicality of the material is improved.

Description

technical field [0001] The invention relates to the technical field of functionalization of polylactic acid materials, in particular to a highly absorbent porous composite film used for adsorbing PM2.5. Background technique [0002] In recent years, China's smog problem has become increasingly serious, among which suspended particulate matter (PM2.5) with a diameter of less than 2.5 microns has posed a huge threat to human health. Therefore, there is an increasing demand for materials that can absorb and block PM2.5. However, the adsorption capacity and mechanical properties of the current adsorption materials still have certain defects, so the preparation of adsorption materials with good comprehensive performance is an urgent problem to be solved. [0003] Polylactic acid (PLA) is a biodegradable material. Its electrospun fiber membrane not only has good biodegradability, physical and mechanical properties and compatibility, but also has the characteristics of high specif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/4382D01D1/02D01D5/00D01F8/14D01F8/16B01D53/02
CPCB01D53/02B01D2253/25D01D1/02D01D5/003D01D5/0069D01D5/0076D01D5/0092D01F8/14D01F8/16D04H1/4382D04H1/728
Inventor 林雨美代秀邵雪莲李淑王新龙
Owner NANJING UNIV OF SCI & TECH
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