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A new photo-Fenton-like catalyst with high activity, Fe 2 V 4 O 13 , has been found. It can be obtained by a simple wet chemical process. The catalyst has a nanolamellar structure with a thinness of less than 100 nm, a BET surface of 52.26 m 2 g -1 , and a band-gap of 1.59 eV favorable to absorption of visible light. Experiments demonstrated that Fe 2 V 4 O 13 could effectively catalyze degradation of Acid Orange II (AOII) by H 2 O 2 in visible light. The degradation was well fitted by a simple pseudo-first-order reaction with a rate constant of 0.0965 min -1 . Moreover, the photo-Fenton-like catalytic activity of Fe 2 V 4 O 13 was much higher than that of not only a-Fe 2 O 3 and V 2 O 5 but also their mixture (Fe 2 O 3 ? 2V 2 O 5 ) with an identical atomic ratio of Fe and V, and that of both Fe 3 O 4 and c-FeOOH. The high catalytic activity of Fe 2 V 4 O 13 possibly involves a special two-way Fenton-like, semiconductor photo-catalytic mechanism and the synergistic activation of Fe(III) and V(V) in Fe 2 V 4 O 13 towards H 2 O 2 .

Iron tetrapolyvanadate (Fe2V4O13) was prepared and characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) measurement and scanning electron microscopy (SEM). It was found that Fe2V4O13 could effectively catalyse H2O2 to generate active OH; therefore, Fe2V4O13 was employed as a new two-metal heterogeneous Fenton-like catalyst. The decomposition of H2O2 and the degradation of Acid Orange II catalysed by Fe2V4O13 could be well described with a simple pseudo-first-order rate equation between the reaction temperatures of 15 degrees C and 30 degreesC. It was inferred from the reaction activation energy data that the generation of the hydroxyl radical was a control step in a series of reactions for the oxidation of Acid Orange II in the presence of H2O2 and Fe2V4O13. The catalytic activity of Fe2V4O13 towards degradation of Acid Orange II was not only much higher than that of alpha-Fe2O3, V2O5 and FeVO4 but also than that of their mixtures with an identical ratio of Fe and V, such as 2FeVO4 + V2O5 and Fe2O3 + 2V2O5. The high catalytic activity possibly involved a special two-way Fenton-like mechanism and the synergistic activation of Fe(III) and V(V) in Fe2V4O13 towards H2O2.