Preparation of three-dimensional palygorskite based carrier

Abstract

Palygorskite is a kind of crystalline hydrated magnesium aluminum silicate mineral with micro-fibrous morphology. Due to the large specific surface area, moderate cationic exchange capacity and pronounced adsorption properties, it has been widely used in many fields. In order to enhance the loading capacity and adjust the microstructure of palygorskite (Pal) crystal, series of three-dimensional palygorskite carriers (3D Pal) with different pore size were fabricated through grafting from or grafting onto method. Due to the functional and cross-linked molecules act as upholder reagents, the specific surface of individual palygorskite is fully utilized and the load capacity is greatly improved. The porosity and pore size of 3D palygorskite based carrier also can be regulated by the length of organic molecular chain segments. The successful preparation of 3D Pal-based carrier provides a new way for surface grafting, modification or preparing 3D carrier of palygorskite and other minerals. • The developed method allows fabricating three-dimensional palygorskite based carriers by covalent bonding method. • The pore size of the as-prepared carriers can be conveniently adjusted by length of the bonded molecular chain.

Keywords

• Functionalized palygorskite
• Diisocyanate
• Porous carrier
• Grafting from
• Grafting onto