A molten-salt growth method was developed for the synthesis of Bi25FeO40 crystals. Degradation of rhodamine B(RhB) and 2,4-dichlorophenol(2,4-DCP) was carried out in aqueous medium and a cooperating Bi25FeO40/H2O2/sunlight system, respectively. In the cooperating system, the degradation rate of RhB and 2,4-DCP was enhanced prominently and pH was found to be a key factor for the photocatalytic degradation of RhB and 2,4-DCP. The best performance of degradation of RhB was observed at pH 3.0 and the degradation rate was 95% under 4 h simulated sunlight irradiation. On the other hand, complete photocatalytic degradation of 2,4-DCP was achieved in 90 min at pH 6.0. (C) 2016 Elsevier B.V. All rights reserved.