Preparation method of layered silicate mineral material based efficient adsorbent

Abstract

The invention discloses a preparation method of a layered silicate mineral material based efficient adsorbent. The preparation method comprises steps as follows: layered silicate mineral is soaked inwater and is filtered after absorbing water sufficiently, and low-temperature drying is performed; freezing treatment is performed, and the temperature is reduced to zero DEG C or lower; an obtained material is put in a vacuum suction filter and subjected to vacuum pumping treatment; finally, the material is subjected to high-temperature drying treatment, and the layered silicate mineral materialbased efficient adsorbent is obtained. A freeze stripping method is a physical modification process performed under the condition that original interlayer spacing of the adsorbent is not changed, andother chemical modifiers are not needed; secondary pollution caused by the modification process is effectively avoided. A layered silicate mineral material is treated with the freeze stripping methodas a physical treatment method, so that the specific surface area of mineral can be increased, and the adsorption capacity of the mineral is greatly improved. Particularly, no chemical reagents are adopted for modification, and secondary pollution to the to-be-adsorbed material is avoided.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method of a layered silicate mineral material high-efficiency adsorbent. Background technique [0002] Layered silicate minerals are widely distributed in nature and are the main minerals constituting the earth's crust and important industrial mineral materials. Because the particles are charged, have a large specific surface area and a certain ion exchange capacity, they are mostly used as adsorbents in many fields to treat various types of wastewater. Usually, this type of adsorption material has limited adsorption capacity for toxic organic pollutants in water, and cannot achieve the ideal treatment effect. It is necessary to modify the minerals to improve its adsorption performance. Traditional modification methods mainly include inorganic, organic, acid modification, cross-linking modification and so on. However, the above-mentioned modification...

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Problems solved by technology

However, the above-mentioned modification methods have problems such as generally high processing costs, cumbersome process, and serious secondary pollution caused by the use of a large amount of chemical reagents.

[0003] Existing literature has described in detail the different chemical modification methods of layered silicate clay minerals, especially montmorillonite. The preparation methods of the modified minerals mentioned in the paper all need to add a variety of chemical reagents, which will produce secondary Sub-pollution, changes in mineral interlayers and pore structures, etc.

So far, there are few reports on the preparation of thin-crystalline layered silicate mineral adsorbents without changing the mineral layer spacing and chemical properties.

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