Preparation and flocculation behavior of iron-chitosan flocculant

Chitosan(CTS) has been modified by inorganic impregnation to prepare an CTS-Fe flocculant.The flocculation behavior of the resulting material was investigated with kaoline.The results showed that the optimum conditions are as follows: a dosage of CTS-Fe of 5 mg/L,a molar ratio in the flocculant of m(CTS)∶m(Fe)=2∶1,and a pH of 7.Under these conditions,the sedimentation rate with kaoline was 88.75%.The flocculation efficiency of CTS-Fe was found to be superior to those of chitosan,polyiron(PFC) and polyiron-chitosan and a lower dosage of CTS-Fe is required.