公开(公告)号：US10179314B2

公开(公告)日：2019-01-15

申请号：US15120637

申请日：2014-04-28

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Xie Quan ,  Gaoliang Wei ,  Shuo Chen ,  Hongtao Yu

IPC: B01D67/00 ,  B01D69/02 ,  B01D69/08 ,  B01D69/14 ,  B01D71/38 ,  B82B3/00 ,  B01D71/02 ,  B01D71/32 ,  B01D71/42 ,  B01D71/44 ,  B01D71/66

Abstract: The invention, belonging to the field of membrane technology, presents a method for the high-throughput preparation of carbon nanotube hollow fiber membranes. This method contains three major steps. Firstly, the pristine carbon nanotubes (CNTs) are added into a mixture of concentrated nitric acid and sulfuric acid, which is then heated at 40˜80° C. for 0.5˜6 hours. Secondly, the surface-functionalized CNTs and polyvinyl butyral (PVB) are dispersed and dissolved, respectively, in organic solvents at a mass ratio of 1:0.2˜1:4˜8 to form homogeneous spinning solution, which is squeezed into water as shell liquid with water as core liquid at a flow rate ratios of 0.5˜5:1 through a spinneret to form CNT/PVB hollow fibers. Finally, the dry fibers are calcinated at 600˜1000 ° C. for 1˜4 hours in absence of oxygen to produce free-standing CNT hollow fiber membranes. The method involved in this invention is simple and highly efficient without needing any templates, expensive apparatuses and chemicals. Additionally, the obtained electrically conductive CNT hollow fiber membranes feature a high porosity, high water flux and strong acid/alkali resistance.

公开(公告)号：US11701621B2

公开(公告)日：2023-07-18

申请号：US16325168

申请日：2017-06-02

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Xie Quan ,  Gaoliang Wei ,  Shuo Chen ,  Hongtao Yu

IPC: B01D67/00 ,  B01D71/02 ,  B01D69/12 ,  C01B32/184 ,  B01D69/02

CPC classification number: B01D67/0062 ,  B01D67/0067 ,  B01D69/02 ,  B01D69/122 ,  B01D71/021 ,  C01B32/184 ,  B01D67/0011 ,  B01D2325/04 ,  C01B2204/02 ,  C01B2204/04

Abstract: The invention, belonging to the field of membrane technology, presents a method for the direct growth of ultrathin porous graphene separation membranes. Etching agent, organic solvent and polymer are coated on metal foil, and then they are calcined at high temperature in absence of oxygen; after removal of metal substrate and reaction products, single-layered or multi-layered porous graphene membranes are obtained. Alternatively, the dispersion or solution of etching agent is coated on metal foil, on which a polymer film is then overlaid. The obtained sample is subsequently calcined at high temperature in absence of oxygen; after removal of metal substrate and reaction products, single-layered or multi-layered porous graphene membranes are obtained. The method involved in this invention is simple and highly efficient, and allows direct growth of ultrathin porous graphene separation membranes, without needing expensive apparatuses, chemicals and graphene raw material. Additionally, the graphene membranes prepared with this method have controlled pore size, ultrahigh water flux and strong resistance to irreversible fouling.