The physicochemical properties and preparation method of slime

Stickman

[Physical and chemical properties] Clay minerals refer to water-bearing layered silicate minerals with a particle size of less than 2μm , mainly including illite, vermiculite, kaolinite, smectite, palygorskite and other minerals

Clay has good adsorption and ion exchange performance due to its unique layered structure, and its large reserves and low price make it a kind of high-quality and cheap adsorbent with great development prospects

[Preparation method] Natural clay is generally formed by the weathering of silicate minerals on the earth's surface, and some diagenesis will also produce clay

Clay minerals have strong hydrophilicity due to the silica structure on their surface, and the cations on the outside of the structure have hydrolysis.

There are two common methods of clay modification

①Inorganic pillared clay minerals modified by inorganic cations.

② The organic modification of clay minerals by organic layered pillared clay minerals is due to the existence of a large number of exchangeable hydrophilic inorganic cations in natural clay minerals, so that there is always a thin water film on the actual clay surface, which cannot effectively adsorb hydrophobic organic Pollutants

③Inorganic-organic composite layered pillared clay mineral E.

Modification example 1: Graft polyacrylonitrile

Using acetic acid solution with pH=3.

60mL of freshly steamed N,N-dimethylformamide (DMF) was vented with argon gas for 30 minutes, and then 0.

The grafted product was saponified with 1mol/L NaOH solution at 80°C for 1.

Modification example 2: Lanthanum chloride modified clay

Take 500mL, 2% (mass fraction) LaCl3 aqueous solution (initial pH value is 8.

Modification example 3: Microwave modified attapulgite clay

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