Preparation method of polyethersulfone functionally graded composite membrane capable of efficiently disposing of heavy metals

A functional gradient, polyethersulfone technology, which is applied in the field of preparation of modified polyethersulfone functional gradient composite membranes, can solve problems such as unsatisfactory emission

Active Publication Date: 2020-10-16
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the nanofiltration membrane has the interception and removal efficiency for heavy metal ions, the wastewater containing inorganic salts and high-concentration heavy metal ions cannot be discharged up to the standard after being treated by the nanofiltration membrane.

Method used

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  • Preparation method of polyethersulfone functionally graded composite membrane capable of efficiently disposing of heavy metals
  • Preparation method of polyethersulfone functionally graded composite membrane capable of efficiently disposing of heavy metals
  • Preparation method of polyethersulfone functionally graded composite membrane capable of efficiently disposing of heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Primary chloroacetylation treatment of polyethersulfone:

[0055]First, 8g of polyethersulfone powder is added to a three-necked round-bottomed flask containing 130g of chloroform, then the three-necked round-bottomed flask is fixed on a magnetic stirrer, and one side of the three-necked round-bottomed flask is fed with nitrogen protection, and the other side is The mouth is connected to an absorption tube filled with activated carbon particles to absorb the chloroform volatilized by the reaction. The middle mouth of the three-necked round-bottom flask is sealed with a ground glass stopper, and then slowly adjust the stirrer speed to 200r / min and stir for 30min. When polyethersulfone becomes a fluffy block in chloroform, adjust the stirrer speed to 550r / min, and continue to magnetically stir the solution at room temperature until the fluffy block polyethersulfone is completely dissolved in the chloroform solvent; After completely dissolving, extend the glass cathete...

Embodiment 2

[0073] (1) Primary chloroacetylation treatment of polyethersulfone:

[0074] First, 8g of polyethersulfone powder is added to a three-necked round-bottomed flask containing 134g of chloroform, then the three-necked round-bottomed flask is fixed on a magnetic stirrer, and one side of the three-necked round-bottomed flask is fed with nitrogen protection, and the other side is The mouth is connected to an absorption tube filled with activated carbon particles to absorb the chloroform volatilized by the reaction. The middle mouth of the three-necked round-bottom flask is sealed with a ground glass stopper, and then slowly adjust the stirrer speed to 200r / min and stir for 30min. When polyethersulfone becomes a fluffy block in chloroform, adjust the stirrer speed to 550r / min, and continue to magnetically stir the solution at room temperature until the fluffy block polyethersulfone is completely dissolved in the chloroform solvent; After completely dissolving, extend the glass cathet...

Embodiment 3

[0091] (1) Primary chloroacetylation treatment of polyethersulfone:

[0092]First, 8g of polyethersulfone powder is added to a three-necked round-bottomed flask containing 138g of chloroform, then the three-necked round-bottomed flask is fixed on a magnetic stirrer, and one side of the three-necked round-bottomed flask is fed with nitrogen protection, and the other side is The mouth is connected to an absorption tube filled with activated carbon particles to absorb the chloroform volatilized by the reaction. The middle mouth of the three-necked round-bottom flask is sealed with a ground glass stopper, and then slowly adjust the stirrer speed to 200r / min and stir for 30min. When polyethersulfone becomes a fluffy block in chloroform, adjust the stirrer speed to 550r / min, and continue to magnetically stir the solution at room temperature until the fluffy block polyethersulfone is completely dissolved in the chloroform solvent; After completely dissolving, extend the glass cathete...

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Abstract

Disclosed is a preparation method of a polyether sulfone functional gradient composite membrane capable of efficiently disposing heavy metals. Firstly, chloroacetylated polyethersulfone with a high grafting rate is prepared by two times of chloroacetylation; secondly, subjecting chloroacetylated polyethersulfone and 3-(trimethoxysilyl)-1-propanamine and diethylenetriaminepentaacetic acid to a chemical bonding reaction so as to graft a polyaminocarboxylic acid functional group into the polyether sulfone; thirdly, preparing a polyether sulfone separation membrane with the polyaminocarboxylic acid functional group by using a phase transfer technology; and finally, coating the surface of the separation membrane with a piperazine aqueous solution and a trimesoyl chloride n-heptane solution, andforming a dense nanofiltration ultrathin layer on the surface of the separation membrane by an interfacial polymerization reaction to prepare the polyether sulfone functional gradient composite membrane. The method of the invention is simple and feasible and has little harm to human health. The prepared composite membrane organically combines the adsorption of a micro-ultrafiltration chelating membrane and the retention of a nanofiltration membrane, thereby ensuring that high-concentration heavy metal wastewater can be directly discharged because the wastewater reaches the standard or reusedafter being treated by the polyether sulfone functional gradient composite membrane.

Description

technical field [0001] The invention relates to a preparation method of a modified polyethersulfone functional gradient composite membrane. Background technique [0002] Wastewater produced in the processes of mining production, machinery manufacturing, electroplating, chemical plating, and non-ferrous metal smelting and processing contains various heavy metal pollutants. The heavy metals discharged into the natural environment along with the production wastewater will cause surface water, soil, groundwater, etc. Cause serious pollution, and then seriously affect the health of the water ecological environment. Heavy metal pollutants such as lead, nickel, cadmium, mercury, chromium, copper, and zinc in water are biodegradable and highly toxic. They can be passed through the food chain, easily enriched in organisms, and have biotoxicity and synergistic effects. characteristics, causing serious harm to environmental organisms and human health. Many incidents of mercury, chrom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D67/00B01D69/12B01D61/14B01D61/02C02F1/44C02F101/20
CPCB01D61/027B01D61/145B01D61/147B01D67/00B01D69/125B01D71/68C02F1/442C02F1/444C02F2101/20
Inventor 宋来洲许乔波李希达郁长天吉敏牛倩倩王秀丽
Owner YANSHAN UNIV
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