Heavy metal adsorption material as well as preparation method and application thereof

Abstract

The invention discloses a heavy metal adsorption material as well as a preparation method and an application thereof. A filtering material is prepared from raw materials in parts by weight as follows: 38-46 parts of wollastonite, 11-19 parts of tetrahydrofurfuryl alcohol, 3-7 parts of calcium acetate and 15-23 parts of polyethylene resin. Wollastonite and the polyethylene resin are mixed, ground and mixed with a tetrahydrofurfuryl alcohol solution, the mixture is sealed, heated and stirred, a calcium acetate solution is dropwise added to the mixture, the mixture is subjected to high-temperature ultrasonic treatment, stirred and calcined at a high temperature, and the filtering material is obtained. The filtering material has a high adsorption and fixing function on trivalent arsenic and pentavalent arsenic, and the removal rate of heavy metal ions is high; water filtered with the filtering material has stable alkalescence. The filtering material is mainly used for filtering water and waste water and can be treated with acid and recalcined after being used for recycling. The preparation method is mild in reaction condition, simple to operate and low in cost.

Description

technical field [0001] The invention relates to the technical field of water treatment materials, in particular to a heavy metal adsorption material and its preparation method and application. Background technique [0002] Arsenic is one of the highly toxic elements, and it is also the main inorganic toxin removed in the drinking water standards of various countries. It exists mostly in trivalent and pentavalent states in natural water bodies. However, as a metal element, it does not exist in the state of common cations, but mainly exists in the form of arsenite and arsenate. Even modern technologies such as reverse osmosis membrane (RO) have a removal rate of only about 50% for trivalent arsenic, which cannot meet the filtering requirements for arsenic. In addition, the filter material must take into account the fixation problem after adsorption for the filtration of arsenic and extremely toxic heavy metals. Traditional porous ceramics and ceramic filter elements can rem...

AI Technical Summary

Problems solved by technology

Even if the removal rate of trivalent arsenic by modern technology such as reverse osmosis membrane (RO) is only about 50%, it cannot meet the filtration requirements for arsenic

In addition, the filter material must take into account the immobilization problem after adsorption for the filtration of arsenic and extremely toxic heavy metals

Traditional porous ceramics and ceramic filter elements use the natural porous structure of diatomite to remove bacteria and macromolecular organic matter, but cannot remove arsenic and heavy metals in the ion state

In the existing technology, raw materials such as montmorillonite and medical stone are mostly used, which have a strong adsorption force for heavy metal ions and harmful toxins. Wollastonite has a huge reserve in my country, but it does not swell in water for a long time , the effect of adsorbing heavy metals is poor, so there is less information about using wollastonite as raw material for the treatment of heavy metals, etc.

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