Preparation method of polylactic acid hydroxyacetic acid based composite nano fiber membrane for high-efficiency adsorption of mercury ions

A technology of polylactic acid glycolic acid base and composite nanofibers, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problems of no discovery, achieve low cost, simple preparation method, and high-efficiency adsorption efficiency effect

Active Publication Date: 2017-05-03
王亚军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Retrieve related Hg at home and abroad 2+ The results of the literature and patents on the adsorbed nanofiber membrane show that: at present, no composite nanofibers have been obtained by electrospinning after modifying the fifth-generation polyamide-amine dendrimers with PEGylated thymine membrane for Hg 2+ Selective and efficient adsorption reports

Method used

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  • Preparation method of polylactic acid hydroxyacetic acid based composite nano fiber membrane for high-efficiency adsorption of mercury ions
  • Preparation method of polylactic acid hydroxyacetic acid based composite nano fiber membrane for high-efficiency adsorption of mercury ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) First add 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride EDC and N-hydroxysuccinimide to thymine-1-acetic acid Thymine-COOH solution Carboxyl activation by NHS, followed by polyethylene glycol NH 2 -PEG-COOH was added to the Thymine-COOH solution, stirred and reacted for 3 days, and then freeze-dried to obtain thymine-modified polyethylene glycol T-PEG-COOH, in which Thymine-COOH, EDC, NHS and NH 2 -The ratio of the amount of substances of PEG-COOH is 2:10:10:1;

[0021] (2) Weigh T-PEG-COOH and the fifth generation polyamide-amine dendrimer G5.NH with a mass ratio of 1:2 2 and stirred with ultrapure water to dissolve. Add EDC and NHS to the T-PEG-COOH solution for carboxyl activation, and then add G5.NH 2 Added into the T-PEG-COOH solution, stirred for 3 days, and freeze-dried to obtain the T-PEG-COOH modified dendrimer G5-PEG-T, wherein the substances of T-PEG-COOH, EDC and NHS The volume ratio is 1:5:5;

[0022] (3) Mix and dissolve G5-PEG-T wit...

Embodiment 2

[0024] Composite nanofiber membrane against Hg 2+ The test results of adsorption efficiency.

[0025] Select HgCl 2 As a simulated pollutant, configure 40 mL of HgCl with a concentration of 20 mg / L 2 solution. Take the PLGA / G5-T, PLGA / G5-PEG and PLGA / G5-PEG-T composite nanofiber membranes of the products obtained in Comparative Example 1, Comparative Example 2 and Example 1 (3), add HgCl respectively at room temperature 2 solution and stirred. Take samples at predetermined time points for ICP-OES testing to monitor Hg in solution 2+ Changes in ion content ( figure 1 ).

[0026] The results show that: compared with the PLGA / G5-PEG composite nanofiber membrane added in Comparative Example 1 and the PLGA / G5-PEG composite nanofiber membrane added in Comparative Example 2, the addition of PLGA / G5-PEG-T composite nanofiber membrane In the next 60 min, the Hg in the solution 2+ Concentration drops obviously, drops to 19%, can get the Hg of this composite nanofiber through cal...

Embodiment 3

[0028] Test results of composite nanofibrous membranes for specific adsorption of different ions.

[0029] Using CuCl 2 , CdCl 2 、CoCl 2 and HgCl 2 Formulated with Cu 2+ 、Cd 2+ 、Co 2+ and Hg 2+ The mixed metal ion solution, the initial concentration of various metal ions in the mixed metal ion solution is the same. Detection of Hg by PLGA / G5-PEG-T composite nanofibrous membrane by ICP-OES 2+ selective adsorption properties. During the experiment, a mixed solution with each ion concentration of 15 mg / mL was prepared, 70 mg of PLGA / G5-PEG-T was taken for adsorption, and samples were taken at two time points of 30 min and 60 min for ICP-OES testing to detect the concentration of ions in the solution. Cu 2+ 、Cd 2+ 、Co 2+ and Hg 2+ Changes in ion content ( figure 2 ).

[0030] The results show that: the test was carried out at two times of 30 min and 60 min, and it was found that at 30 min and 60 min, Cu 2+ 、Cd 2+ 、Co 2+ and Hg 2+ The concentrations of all decre...

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Abstract

The invention relates to a preparation method of a polylactic acid hydroxyacetic acid based composite nano fiber membrane for high-efficiency adsorption of mercury ions, wherein the preparation method comprises the steps: modifying the surface of a fifth-generation polyamide-amine dendritic macromolecule G5.NH2 by PEGylated thymine PEG-T, to obtain G5-PEG-T, and then mixing the G5-PEG-T with polylactic acid hydroxyacetic acid PLGA, to obtain a PLGA/G5-PEG-T composite nano fiber membrane by an electrostatic spinning method. The used raw materials are relatively low in price; and the prepared polylactic acid hydroxyacetic acid based composite nano fiber membrane has excellent specificity and high-efficiency Hg<2+> adsorption effect, has simple preparation process, and can be used for treatment of Hg<2+>-containing wastewater in chlorine-alkali manufacturing, papermaking, oil refining, paints, pharmacy, battery manufacturing and other industrial production.

Description

technical field [0001] The invention belongs to the field of preparation of nanofibrous membranes that adsorb heavy metal ions, and in particular relates to a preparation method of polylactic acid glycolic acid-based composite nanofiber membranes that efficiently adsorb mercury ions. Background technique [0002] Mercury is considered the most toxic heavy metal due to its long-lasting effects, mobility, and bioaccumulation. No matter mercury element or mercury compound can form methylmercury under special circumstances, a trace amount of methylmercury can damage the human central nervous system, kidneys and other organs. Industrial production such as chlor-alkali manufacturing, paper making, oil refining, paint, pharmaceutical and battery manufacturing often produce a large amount of Hg 2+ waste water. At present, many methods have been used to remove Hg from wastewater 2+ , such as electrochemical deposition, biological treatment and adsorption technology, ion exchange, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28D04H1/4382D04H1/728
CPCB01J20/265B01J20/28038C02F1/285D04H1/4382D04H1/728
Inventor 羊梦诗李鑫
Owner 王亚军
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