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A thin film composite membrane

A thin film and polymer technology, applied in the field of thin film composite film and its formation, can solve the problems of difficult to manufacture selective layer, large size, etc.

Inactive Publication Date: 2020-08-21
NAT UNIV OF SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, considering the relatively large size of many additives compared to the thickness of the selective layer, it is difficult to fabricate a defect-free selective layer composed of uniformly dispersed additives.

Method used

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  • A thin film composite membrane
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Examples

Experimental program
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Effect test

Embodiment 1

[0102] Chemicals and Materials

[0103] Bought 3100P polyethersulfone (PES, Solvay Advanced Polymer), N-methyl-2-pyrrolidone (NMP, 99.5%, Merck), polyethylene glycol 400 (PEG, Mw=400g / mol, Acros Organics) and glycerin (industrial Grade, Aik Moh Pains & Chemicals Pte.Ltd.), PES hollow fiber support layer for fabrication and post-processing of TFC membranes. In the interfacial polymerization process, 1,3,5-benzenetricarboxylic acid chloride (TMC, 98%, Sigma-Aldrich), hexane (99.9%, Fisher Chemicals), m-phenylenediamine (MPD, 98%, T.C.I.) and ten Sodium Dialkyl Sulfate (SDS, 99%, Sigma-Aldrich) to make the polyamide selective layer of the TFC membrane. CQDs were synthesized and functionalized using citric acid (99.5%, Sigma-Aldrich) and sodium hydroxide (98%, Sigma-Aldrich). Sodium chloride (NaCl, 99.5%, Merck) was obtained to prepare all saline solutions in this work. Deionized (DI) water used in this work was produced by a Milli-Q ultrapure water system (Millipore, USA). ...

Embodiment 2

[0164] Chemicals and Materials

[0165] use 3100P polyethersulfone (PES, Solvay Advanced Polymer), polyethylene glycol 400 (PEG, Mw=400g / mol, Acros Organics), N-methyl-2-pyrrolidone (NMP, 99.5%, Merck) and glycerol (industrial Grade, Aik Moh Pains & Chemicals Pte.Ltd.) prepared porous hollow fiber substrates. By using 1,3,5-benzenetricarbonyl chloride (TMC, 98%, Sigma-Aldrich) in hexane (99.9%, Fisher Chemicals) and containing sodium dodecyl sulfate (SDS, 99%, Sigma-Aldrich) Interfacial polymerization of m-phenylenediamine (MPD, 98%, T.C.I.) in an aqueous solution of a polyamide layer was deposited on top of the inner surface of the porous substrate. CQDs were synthesized from citric acid (99.5%, Sigma-Aldrich) and then functionalized with sodium hydroxide (98%, Sigma-Aldrich) to generate NaCQDs. Sodium chloride (NaCl, 99.5%, Merck) was used for membrane performance testing. All chemicals were used as received without further purification. Throughout the experiments, dei...

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Abstract

There is provided a thin film composite (TFC) membrane comprising a support layer and a selective layer, formed of a cross-linked polyamide comprising Na+-functionalised carbon quantum dots (NaCQD), on a surface of the support layer. There is also provided a method of forming the TFC membrane.

Description

technical field [0001] The invention relates to a thin film composite membrane and a forming method thereof. Background technique [0002] Osmotic energy is increasingly recognized as one of the promising renewable and sustainable energy sources. Pressure-retarded osmosis (PRO) is one of the main techniques aimed at harvesting osmotic energy from two solutions with different salinities. PRO employs a semi-permeable membrane between these two solutions. Due to the chemical potential difference, water spontaneously diffuses across the semipermeable membrane from the low concentration side (i.e., the feed solution) to the pressurized high concentration side (i.e., the draw solution), which results in a higher pressure or higher volume in the draw solution chamber. Big. Therefore, the hydrostatic potential energy can be converted for power generation by means of turbines or pressure exchangers. Integration between PRO and seawater reverse osmosis (SWRO) desalination and memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D69/14C01B32/15B01D61/00B01D67/00B01D71/56
CPCB01D71/56C01B32/15B01D69/148B01D71/021B01D67/0006B01D2323/40B01D69/1251B01D69/1411B01D67/00793B01D69/02B01D69/08B01D71/68B01D2325/04B01D2325/16B01D2325/20B01D2325/24
Inventor 盖文潇赵蝶玲钟台生
Owner NAT UNIV OF SINGAPORE
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