A photo-Fenton-Like system (PW

11

Fe/H

2

O

2

) using Keggin-type Fe(Ⅲ)-substituted〓heteropolyanion PW

11

O

39

Fe(Ⅲ)(H

2

O)

4-

(PW

11

Fe) as the visible light activity component was studied

which was employed for the photocatalytic degradation of model pollutant rhodamine B (RhB) under an artificial VIS irradiation. Influences of the H

2

O

2

concentration

the PW

11

Fe concentration

the initial RhB concentration and the solution pH on the photocatalytic degradation rate of RhB was also examined

together with a discussion on the kinetics of RhB degradation. The results showed that the degradation ratio of 100% was obtained at 60 min for 0.01 mmol·L

-1

RhB with the optimum conditions of pH 4.5

0.6 mmol·L

-1

PW

11

Fe and 4 mmol·L

-1

H

2

O

2

under the irradiation of 250 W metal halide lamp. The total organic carbon (TOC) removal was about 48% at 240 min. The hydroxyl radical quenching and electron paramagnetic resonance (EPR) experiments revealed that hydroxyl radicals generated by PW

11

Fe/H

2

O

2

system under visible light irradiation were the main reactive oxygen species

resulting in the rapid degradation of RhB. The apparent rate constant of RhB degradation was estimated to be (6.2±2) 10

-2

mmol·L

-1

· min

-1

.