Ultrafiltration membrane for wastewater treatment and preparation method thereof

Abstract

The invention discloses an ultrafiltration membrane for wastewater treatment and a preparation method of the ultrafiltration membrane. The ultrafiltration membrane is prepared from the following components: chlorinated polyvinyl chloride, modified polyacrylonitrile, polyethylene glycol, polyoxyethylene fatty alcohol ether and dimethylformamide. The ultrafiltration membrane is subjected to hydrophilic modification, so that the infiltration rate of the ultrafiltration membrane is high, the water flux of the ultrafiltration membrane is increased, and the rejection rate of the ultrafiltration membrane is increased; after the polyvinyl chloride is subjected to chlorination modification, the chlorine content of the material is improved, so that the molecular bond polarity of the material is increased, the intermolecular force is enhanced, the chemical stability is improved, and the mechanical property, the chemical corrosion resistance and the heat resistance of the material are greatly improved; polyacrylonitrile is modified, so that precious metal ions and rare metal ions have high adsorption capacity; and the ultrafiltration membrane is good in wastewater treatment effect, good in physical property and mechanical property and not prone to loss, and the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an ultrafiltration membrane used for wastewater treatment and a preparation method thereof. Background technique [0002] Membrane is a material with selective separation function. The process of using the selective separation of membrane to realize the separation, purification and concentration of different components of feed liquid is called membrane separation technology. As a new separation technology, membrane separation technology has been widely used in gas separation, material separation and water treatment. Among them, the demand for membrane products in the field of water treatment is the largest. It is different from traditional filtration in that membranes can be separated in the molecular range, and this The process is a physical process without phase changes and additives. [0003] In the field of membrane separation applications, polyvinyl chloride has the adva...

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Problems solved by technology

[0005] In order to overcome the above-mentioned technical problems, the object of the present invention is to provide a kind of ultrafiltration membrane and preparation method thereof for waste water treatment: (1) by chlorinated polyvinyl chloride, modified polyacrylonitrile, polyethylene glycol Put it into dimethylformamide, mix it evenly, and vacuum defoam to obtain the raw material solution, spin the raw material solution through a spinning machine to obtain a fiber film, immerse the fiber film in a deionized water coagulation bath, and then solidify The fiber membrane is stretched to obtain a fiber ultrafiltration membrane, and deionized water is added to the polyoxyethylene fatty alcohol ether to form a polyoxyethylene fatty alcohol ether solution after completely dissolving, and the fiber ultrafiltration membrane is put into the polyoxyethylene fatty alcohol ether Soak in the solution, carry out hydrophilization treatment, take out the fiber ultrafiltration membrane after hydrophilization treatment, and dry it at room temperature to obtain the ultrafiltration membrane used for wastewater treatment, which solves the problem of existing polyvinyl chloride ultrafiltration Poor membrane hydrophilicity and lower flux; (2) by polyvinyl chloride, deionized water, concentrated hydrochloric acid, vinyltrimethylsilane, (perfluorohexyl) phenyliodonium trifluoromethanesulfonate , Alkyl glucoside is put into the reaction kettle, feed chlorine gas to react, wash with distilled water and filter, remove the filtrate, dry the filter cake to obtain chlorinated polyvinyl chloride, which solves the problem of the existing polyvinyl chloride ultrafiltration membrane Poor toughness, poor chemical corrosion resistance; (3) by washing polyacrylonitrile with aqueous sodium carbonate solution and soap flake solution, then washing with deionized water, and then drying polyacrylonitrile, the dry polypropylene Nitrile is put into hydroxylamine hydrochloride aqueous solution, using sodium hydroxide to adjust the pH, then stirring the reaction, cooling after the reaction, then taking out the product, washing the product with ethanol solution and distilled water to obtain modified polyacrylonitrile, which solves the problem of existing polyacrylonitrile The problem of poor adsorption of vinyl chloride ultrafiltration membrane

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