Macromolecular negative-charge ultrafiltration membrane and preparation method thereof
A negatively charged, polymer technology, applied in the field of polymer negatively charged ultrafiltration membranes and their preparation, to achieve high separation efficiency, adjustable thickness, and simple operation
Active Publication Date: 2013-07-31
XIAMEN UNIV
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Problems solved by technology
However, there is no preparation method of ultra-thin charged polymer ultrafiltration membrane with simple process and good operability.
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[0027] The present invention will be further described below in conjunction with the examples, but it does not limit the protection scope of the present invention.
[0028] The following examples will illustrate a kind of cut-off pore size is less than 5nm, pure water flux is higher than 2000L m -2 h -1 bar -1 Sulfonated polyethersulfone negatively charged ultrafiltration membrane and preparation method thereof.
[0029] 4mM copper nitrate solution and 1.2mM ethanolamine solution were mixed in equal volumes, and the copper hydroxide nanowire monodisperse solution was obtained after standing for 5-10 days. The surface of the nanowire has a large number of positive charges, the diameter is about 2.5nm, and the average length is 4μm. At the same time, sulfonated polyethersulfone is prepared by using concentrated sulfuric acid as a sulfonating agent to sulfonate the polyethersulfone, and the sulfonated polyethersulfone with a sulfonation degree in the range of 0.2-0.9 is obtain...
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Abstract
The invention relates to a macromolecular negative-charge ultrafiltration membrane and a preparation method thereof, and relates to the technical field of membrane separation. The preparation method comprises the following steps of: preparing a nanowire dispersion solution; preparing a negative-charge macromolecular material dilute solution; filtering 2-20mg / mL of nanowire dispersion solution to a macroporous support layer to form a nanowire template layer; filtering 0.5-5mg / mL of 0.05-10mg / mL negative-charge macromolecular dilute solution through the nanowire template layer; enabling negative-charge macromolecules to be self-assembled onto the outer surface of the nanowire template layer to form a self-assembly layer; and dissolving / removing a nanowire template to form a negative-charge mesoporous separation layer, thereby finally obtaining the macromolecular negative-charge ultrafiltration membrane. According to the prepared macromolecular negative-charge ultrafiltration membrane, the pore size is smaller than 10nm and the thickness of the separation layer is adjustable within a range of 50-500nm; and the prepared membrane has the characteristics of high permeation flux, high separation efficiency, good pollution resistance, and the like.
Description
technical field [0001] The invention relates to the technical field of membrane separation, in particular to a polymer negatively charged ultrafiltration membrane and a preparation method thereof. Background technique [0002] As a green and energy-saving emerging industrial technology, membrane technology is an important technology to solve the problems of resource-based water shortage and water quality-based water shortage, and has become the mainstream technology of water treatment. Ultrafiltration is the main force of membrane sewage treatment, and it is also widely used in the food industry and life sciences. With the continuous global attention to health and living environment, its importance is becoming more and more prominent. The core of the ultrafiltration process is a high-performance ultrafiltration membrane with high flux, good retention efficiency, low pollution, and a pore size range of 1 to 100 nm. However, commercial ultrafiltration membranes usually have a...
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IPC IPC(8): B01D69/10B01D71/68B01D67/00
Inventor 张秋根刘庆林邓超朱爱梅
Owner XIAMEN UNIV