A Structurally Optimized Antifouling Polyamide Composite Membrane

Abstract

The invention provides a structurally optimized anti-fouling polyamide composite membrane, the polyamide composite membrane sequentially includes a porous support layer, a polyamide separation layer and a polyamide functional layer, the polyamide functional layer contains titanium dioxide particles and It has a looser pore structure than the polyamide separation layer; the polyamide functional layer is contacted by the aqueous phase monomer II and the organic phase monomer II containing tetrabutyl titanate to simultaneously occur the interfacial polymerization process and tetrabutyl titanate It is obtained through hydrolysis of butyl ester, and the contact process is completed by standing still at a constant temperature of 40-60°C for 10-20s. Compared with the prior art, the present invention provides a new type of polyamide composite membrane, which utilizes a loose polyamide functional layer to fix titanium dioxide on the surface of the polyamide separation layer, thereby ensuring the stability of titanium dioxide while increasing the membrane flux .

Description

technical field [0001] The invention relates to a membrane, in particular to a polyamide composite membrane with anti-pollution ability. Background technique [0002] Membrane separation technology is known as a new technology with a strategic position in the process industry in the 21st century. It has been widely used in water resources, energy, ecological environment, traditional industry transformation and other fields. play an important role. In membrane separation technology, membrane material is the key factor of membrane separation technology. [0003] Polyamide composite membrane is a common composite membrane material for seawater desalination and water treatment in this field. Compared with other membrane materials, polyamide composite membrane has higher desalination rate and water flux, but the anti-pollution ability of polyamide membrane material Poor limits its scope of application. In order to improve its antifouling ability, researchers often hybridize in...

AI Technical Summary

Problems solved by technology

Among them, titanium dioxide is the most commonly used doped particle because of its low cost and easy access. CN102886207A patent document discloses that titanium dioxide is doped in the organic phase to form a polyamide film, but titanium dioxide is easy to agglomerate, and the addition of titanium dioxide destroys the polyamide film. The integrity and uniformity of the amide separation layer makes the desalination rate not high; the CN1401417 A patent document discloses that the prepared polyamide membrane is immersed in the titanium dioxide dispersion so that the titanium dioxide is doped on the membrane surface, but the titanium dioxide particles are combined with the membrane layer Insufficient force, easy to fall off during application, making the film less stable