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Nano polyester film for adsorbing heavy metals and preparation method thereof

A technology for adsorbing heavy metals and polyester films, applied in alkali metal compounds, chemical instruments and methods, adsorption of water/sewage treatment, etc., to achieve good adsorption effect

Inactive Publication Date: 2021-02-09
邓颖菁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(Wang Wenyu, Jin Xu, Shi Changqu, Jin Xin, Li Liuqian, Lin Tong. Preparation of polyester / keratin nanofiber membrane and its chromium ion adsorption performance. Journal of Tianjin University of Technology, 2019,38(03):15-21 .), but there is no report on the use of nano-polyester films modified in the synthesis stage for metal adsorption

Method used

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  • Nano polyester film for adsorbing heavy metals and preparation method thereof
  • Nano polyester film for adsorbing heavy metals and preparation method thereof
  • Nano polyester film for adsorbing heavy metals and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of DMIP-S

[0042] Prepare 500 mL of KOH aqueous solution with pH = 8.5, add 50.05 g (0.36 mol) of benzene ethyl mercaptan, stir evenly, add 27.57 g (0.36 mol) of carbon disulfide dropwise, stir at room temperature for 5 hours, raise the temperature to 85 ° C, and add 103.96g (0.362mol) dimethyl 5-bromomethylisophthalate was stirred for 8h. The reaction solution was distilled under reduced pressure to remove the solvent, and the eluent was passed through the column with dichloromethane to obtain an orange-yellow product with a yield of 76.21%.

Embodiment 2

[0044] Prepare copolyester, denoted as A1.

[0045] Weigh 27.79g (0.14mol) of dimethyl terephthalate, 10.03g (0.024mol) of DMIP-S, 17.74g (0.19mol) of ethylene glycol, 0.08g of trimethyl phosphate, and 0.08g of antimony acetate into the reactor , pass into N 2 , carry out transesterification reaction at 200°C for 4h; then raise the temperature to 240°C, start the vacuum pump to control the vacuum degree within 0.2MPa and carry out precondensation for 4h; continue to raise the temperature to 260°C, control the vacuum degree below 50Pa, and start the total polycondensation After reacting for 5 hours, the vacuum was released with nitrogen and the material was discharged. After cooling, it was sliced ​​to obtain a copolyester with an intrinsic viscosity of 0.69 dL / g.

Embodiment 3

[0047] Prepare copolyester, denoted as A2.

[0048] Weigh 31.74g (0.16mol) of dimethyl terephthalate, 6.25g (0.015mol) of DMIP-S, 17.97g (0.19mol) of ethylene glycol, 0.06g of trimethyl phosphate, and 0.09g of antimony acetate into the reactor , pass into N 2, carry out the transesterification reaction at 180°C for 5 hours; then raise the temperature to 220°C, start the vacuum pump to control the vacuum degree within 0.4MPa and carry out precondensation for 4 hours; continue to raise the temperature to 240°C, control the vacuum degree below 50Pa, and start the total polycondensation After reacting for 5 hours, the vacuum was released with nitrogen and the material was discharged. After cooling, it was sliced ​​to obtain a copolyester with an intrinsic viscosity of 0.76 dL / g.

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Abstract

The invention discloses a nano polyester film for adsorbing heavy metals and a preparation method thereof. The preparation method comprises the following steps of performing ester exchange and condensation polymerization on a synthetic chain transfer agent serving as a third monomer, terephthalic acid and ethylene glycol to synthesize copolyester, grafting the obtained copolyester with an N-containing heterocyclic block and a sulfonic acid group-containing hydrophilic block through a reversible addition fragmentation chain transfer polymerization reaction, and preparing a nano polyester film through electrostatic spinning. The nano polyester film has a good adsorption function on Cd(II) and Cr(VI), has reproducibility, can be recycled for multiple times, and has a potential application prospect in the field of wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a nanometer polyester membrane adsorbing heavy metals and a preparation method thereof. Background technique [0002] In recent years, with the acceleration of industrialization, a large amount of industrial wastewater and urban domestic sewage containing heavy metals have been discharged into the environment, which has brought serious harm to the atmosphere, soil and water environment, especially human health. The main hazard to the human body is lead , cadmium, chromium, mercury, arsenic. At present, there are many methods to deal with heavy metal ions, such as chemical precipitation, ion exchange, etc., but due to the large amount of sludge and secondary pollution, the application is limited, and the membrane adsorption method is easy to operate and low in cost. Potential means of adsorption and purification of heavy metal ions in industrial wastewater. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28D04H1/728D04H1/435D04H3/02D04H3/011C02F101/20
CPCB01J20/264B01J20/28033C02F1/285D04H1/728D04H1/435D04H3/02D04H3/011C02F2101/20
Inventor 邓颖菁
Owner 邓颖菁
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