Microporous polymer sphere, preparation method of microporous polymer sphere and method for removing fluorine in wastewater by using microporous polymer sphere

Abstract

The invention provides transition metal doped microporous polymer spheres, a preparation method of the microporous polymer spheres. The microporous polymer spheres comprise a micro pore polymer matrix and ions of transition metal elements of the fifth period of a periodic table of elements, or oxide grains of which the oxide is of a nanometer size or micrometer size preferably, wherein the ions or the oxide grains are doped in the micro pore polymer matrix; the micro pore polymer matrix consists of a cross-linking polymer network derived from a first monomer and a second monomer as a cross-linking agent; the cross-linking polymer network is connected with hydrophilic groups selected from one or more of sulfo groups, cyano groups, tertiary amine groups, quaternary ammonium groups and hydroxide radicals; when being doped in an ion mode, the transition metal elements are combined with the cross-linking polymer network through at least two hydrophilic groups; when being doped in an oxide mode, preferably a mode of oxide grains of the nanometer size or the micrometer size, the transition metal elements are embedded into the cross-linking polymer network of the micro pore polymer matrix.

Description

technical field [0001] The invention relates to a transition metal-doped microporous polymer ball, a preparation method thereof and a method for removing fluorine from fluorine-containing wastewater. Background technique [0002] Fluorine is contained in many industrial wastewaters, which mainly come from the smelting of non-ferrous metals and rare earth metals, aluminum electrolytic refining, stainless steel pickling and cleaning of silicon electrical parts, fluorosilicates, chlorofluorocarbons and pesticide production processes Wait. [0003] Fluoride can be absorbed by the human body through the digestive tract along with food and drinking water, and can also be absorbed by the human body through the skin, and can accumulate in the body. Fluoride can cause calcium and phosphorus metabolism disorders in the body, resulting in calcium deficiency in the body and skeletal fluorosis, especially pregnant women who need to add more calcium are more prone to skeletal fluorosis. ...

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Problems solved by technology

However, the chemical precipitation method also has the problems of low solubility of chemicals such as lime and low fluorine removal efficiency. The fluorine content in the treated wastewater can generally only be reduced to 15mg / L, which is difficult to meet the international first-class standard

Adsorption methods usually include ion exchange resin, activated carbon and zeolite adsorption method. Ion exchange resin and activated carbon have small adsorption capacity and low efficiency due to their lack of selectivity to fluorine; zeolite has poor selectivity to fluorine, and also has small adsorption capacity and low efficiency. problem, and not suitable for high concentration fluorine wastewater

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