[Sorption rate equation of 2-mercaptopbenzimidazole chelating cellulose for some heavy metal ions].

Chelating cellulose is of simple preparation, excellent nature and low cost. MBM chelating cellulose (CC-MBM) was prepared with chelating reagent (2-mercaptobenzimidazole) grafted on cotton by indirect etherification method. The approach for separating and preconcentrating trace of Pb, Cd, Cu and Ni has advantages of high exchanging speed, high preconcentration multiple, high selectivity and easy elution. The sorption kinetic properties of CC-MBM for several heavy metal ions have also been studied systematically. It is shown that the sorption rate of CC-MBM is very rapid and the reaching time is short. The relation between the sorption amount and time completely complies with following equation Q/Q infinity = at/(1 + at).