The earliest adsorbent used by humans is activated carbon, which has a large specific surface area (500-1700 m2/g). It can remove pollutants from water by physical adsorption, chemical adsorption and ion exchange adsorption. In addition, it demonstrates excellent gas adsorption characteristics.

The resin adsorption is a kind of high molecular polymer, which combines the principles of adsorption and molecular sieve to concentrate and separate organic substances.

The macroporous adsorbent is prepared by suspension polymerization. Its physicochemical properties are stable, insoluble in acids, bases and organic solvents. Its porogen、skeleton and polarity could been designed to meet all kinds of separation requirement.