Fluorine adsorption material as well as preparation method and application thereof

Abstract

The invention provides a fluorine adsorption material and a preparation method and application thereof. The preparation method comprises the following steps: (1) activating silica gel, mixing the activated silica gel with an organic solution of amino silane, and conducting reacting to obtain amino silane modified silica gel; and (2) carrying out acidification reaction on the amino silane modified silica gel and polycarboxylic acid in an acidic solution, adding a metal mixture to carry out chelation reaction, and carrying out alkali liquor treatment to obtain the fluorine adsorption material. The fluorine adsorption material is an adsorbent with high adsorption capacity, high selectivity, easy regeneration capacity and high cyclicity, and can be effectively used for treating fluorine-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a fluorine adsorption material, a preparation method and application thereof. Background technique [0002] Fluorine-containing wastewater is still not up to the standard of less than 1.5mg / L for sewage discharge after ordinary chemical precipitation pretreatment. The equipment cost of membrane technology is relatively high, and the membrane is easy to be polluted, and it is difficult to maintain in the later stage. Adsorption technology has the advantages of fast adsorption speed, strong dynamics, convenient operation, and simple equipment, and is widely used in research and industrial fields. The core of adsorption technology is the preparation and selection of adsorbents, but currently there are common problems in fluoride removal adsorbents: small adsorption capacity, difficult reuse, high cost and so on. Rare earth elements have the advantages of large adsorptio...

AI Technical Summary

Problems solved by technology

[0004] CN113070046A discloses a preparation method of a fluorine-removing adsorbent modified by a biopolymer composite material, comprising the following steps: respectively dissolving chitosan and pectin in deionized water or acid, and mixing and heating the two solutions Biopolymer cross-linking reaction; add molecular sieve soaked in deionized water to the mixed solution, add chloroacetic acid and sodium hydroxide aqueous solution after vacuum distillation, and graft and modify chitosan-pectin biopolymer compound with chloroacetic acid Material: adding metal nitrate dissolved in the mixed solution of ethanol and water to the above-mentioned modified molecular sieve, after vacuum distillation, adding sodium hydroxide solution, stirring at room temperature, metal ions are incorporated into the crystal lattice of the modified polymer; Filter the excess mixed solution, wash with deionized water until neutral, and dry in an oven to obtain a modified fluorine removal adsorbent, which uses organic matter as a carrier. After it fails, it is difficult to recycle it, resulting in waste

The aluminum-based composite oxide-based fluorine removal adsorption material prepared by an ex-situ preparation method or an in-situ preparation method contains two parts: an active component and a porous support matrix; the active component is composed of an aluminum salt solution and an inorganic alkali solution The aluminum-based composite oxide prepared by chemical reaction, the aluminum-based composite oxide is loaded on the surface of the porous supporting matrix by in-situ loading, the mass ratio of the aluminum-based composite oxide to the porous supporting matrix is ​​0.25-25:100, The adsorption effect of the fluorine adsorption material is relatively poor

[0006] The above scheme has the problem of using organic matter as a carrier or poor adsorption effect. Therefore, it is very necessary to develop a fluorine adsorption material that uses inorganic matter as a carrier and has better adsorption effect.