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High-flux covalent organic skeleton composite membrane and preparation method thereof

The invention relates to a high-flux covalent organic skeleton composite membrane and a preparation method thereof, which belongs to the technical field of membrane separation. The high-flux covalentorganic skeleton composite membrane comprises a porous basic membrane and a covalent organic skeleton material selective separation layer in situ growing on the surface of the porous basic membrane; and the covalent organic skeleton material is an imide-type two-dimensional layered covalent organic skeleton material structure. An amino-terminated silane coupling agent or dopamine is used for chemically modifying the surface of the porous basic membrane and then grafted with an aldehyde group-containing micromolecular organic matter to obtain a functional porous basic membrane; the functional porous basic membrane is immersed in a precursor solution for synthesizing the organic skeleton material to be subjected to the reaction; and the porous basic membrane after the reaction is rinsed by adopting an organic solvent and is activated at a high temperature, thus obtaining the high-flux covalent organic skeleton composite membrane. The composite membrane prepared by the invention has highinterception rate for various dyes in water as well as good dye/salt separation performance, and also has high permeation flux.
Owner:BEIJING UNIV OF CHEM TECH

Antioxidation method of nano copper powder

The invention discloses an antioxidation method of nano copper powder, which comprises the steps of: preparing an organic acid aqueous solution the mass concentration of which is 0.1 to 2 percent and controlling the pH within the range of 1 to 5; adding copper powder into the organic acid aqueous solution, mixing continuously, then standing for a certain time, and filtering the supernatant liquor; preparing copper powder anticorrosive solution the mass concentration of which is 0.1 to 2 percent; adding copper powder pulp into the copper powder anticorrosive solution, fully mixing, standing, filtering the supernatant liquor, and obtaining the copper powder pulp; carrying out metathesis on the copper powder pulp for 2 to 4 times by utilizing an organic solvent, and then classifying the copper powder pulp; weighing alcohol-soluble organic the weight of which is 0.1 to 5 percent of that of the copper powder in the copper powder pulp, dissolving the alcohol-soluble organic into an alcohol solvent, preparing a copper powder anticorrosive solution the concentration of which is 0.25 to 5 percent, and adding the obtained copper powder pulp into the copper powder anticorrosive solution and mixing for 0.5 to 2 hours. By the antioxidation method of nano copper powder, a layer of protective film can be covered on the surface of the nano copper powder and effectively isolate oxygen, thus the purpose of antioxidation of copper powder is achieved.
Owner:JIANGSU BOQIAN NEW MATERIALS
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