Using FeCl

3

as oxidant and dopant

polypyrrole/NiFe

2

O

4

composites were prepared by in situ oxidative polymerization to remove high concentration Cr

6+

ions from wastewater solutions. Structure and morphology of polypyrrole/NiFe

2

O

4

composites were characterized using X-ray diffraction (XRD)

scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Their magnetic saturation values were determined using a vibration sample magnetometer (VSM). The results show the composites structure was composed of a polycrystalline NiFe

2

O

4

inner core (diameter 20~30 nm) and outer shells of polypyrrole. The magnetic saturation of polypyrrole/NiFe

2

O

4

composites was found to be 7.89 emu/g. The adsorption of polypyrrole/NiFe

2

O

4

composites for containing chromium(Ⅵ) sewage indicate that the adsorption possesses can reach the adsorption equilibrium within 60 min and have the excellent adsorption capacity. Other influencing factors such as doping ratio of NiFe

2

O

4

adsorption time

pH and initial concentration of Cr

6+

ions were investigated. The maximum adsorption capacity of polypyrrole/NiFe

2

O

4

composites for Cr

6+

is 49.81 mg/g within 30 min under the conditions of pH=5.