Sample Solution

Hu et al. reported that the addition of BiVO4 to TiO2 is accelerated the degradation of gaseous benzene even higher than the pure BiVO4 and TiO2 only [51]. The successful removal of rhodamine B (RhB) was performed by using BiVO4/TiO2 heterojunction structure under UV light and simulated sunlight irradiation [52]. The photocatalytic activity of the BiVO4/TiO2 nanocomposite was investigated for the degradation of gaseous isopropanol under indoor illumination [53]. In Wetchakun et al. study, the BiVO4/TiO2nanocomposites showed good photocatalytic degradation for methylene blue under simulated solar light irradiation [45]. Bao et al. showed that the BiVO4/TiO2 ceramic fibers were novel photocatalysts with high activity for the degradation of the azo dye of X-3B [54]. In Guo et al. study BiVO4/TiO2 nanocomposite exhibited the high photocatalytic activity for the decomposition of RhB under visible light illumination [55]. Li et al. study showed that the degradation processes of MB by BiVO4/TiO2 composites were synergistic reactions by combination photosensitization and photocatalysis under visible light irradiation and were driven by the excitation of MB and BiVO4. The TiO2 as a transporter was played important role in the transfer processes of carriers (electron-hole pairs) on the composite [56]. Sun et al. by using V2O5/BiVO4/TiO2 nanocomposites exhibited a higher photocatalytic activity for the decomposition of gaseous toluene compared to pure TiO2 and V2O5/BiVO4 under visible light irradiation [35]. In another study in 2017, degradation of phenol under visible light by BiVO4/TiO2carried out successfully. This good photocatalytic performance in BiVO4/TiO2 nanocomposite enhances the separation of photogeneration of electron and hole pairs [57].
This study was performed with the aim to degradation of microcystin-LR by BiVO4/TiO2nanocomposite by Response Surface Methodology (RSM) based on Central Composite Design (CCD) to optimize the performance of nanocomposites with consideration of effective variables on process efficiency. This prepared nanocomposites already was used for some organic pollutants