Photocatalytic Properties Of Conducting Polymer/Bi Based Oxide Composites

In the past few decades, the increase of global environmental problems is accompanied by the rapid development of industry and the rapid progress of social. The potential application of photocatalytic technology in environmental purification has been attracted widely attention. The earliest photocatalysts used for degradation of organic pollutants and water splitting was TiO2 which has a wide band gap(～3.2eV). TiO2 can only respond to the UV light region, while accounts for 4% of the solar spectrum, and the utilization of visible light in the solar spectrum is lower. To expand the light catalytic technology for practical application, development of high catalytic efficiency, wide spectral response range and strong practicability of photocatalytic materials are crucial. Bi2WO6 and Bi2MoO6 were the most representative of bismuth based oxide photocatalytic system which were research objects as visible light response photocatalytic material. To improve the light energy utilization rate, the photo-induced charge transfer and the separation efficiency of bismuth based oxide through compositing conductive organic polymers, which enhance the photocatalytic activity of bismuth based oxide effectively. The photocatalytic performance of Bi based oxides was characterized by degradation of typical pollutants RhB. The results showed that the catalytic performance of the composite photocatalysts was improved explicitly. In this paper, the synergistic effect between conjugated conducting polymers and bismuth based oxides is analyzed in detail.In this paper, via in situ chemical oxidative polymerization method to prepare the P3HT/Bi2WO6 surface hybrid photocatalyst. The surface hybridization of conducting polymer P3HT significantly enhanced the photocatalytic efficiency of Bi2WO6. When the loading amount of conductive polymer P3HT is 0.5wt%, the P3HT/Bi2WO6 composite photocatalyst has the best photocatalytic activity in the degradation of RhB, which can be completely degraded in 5min. The synergy between P3HT and Bi2WO6 is also analyzed in detail in this paper. It provides a research ideas to improve the photocatalytic performance.P3HT has a large conjugated π bonds, good hole transporting ability and the visible light response. By in situ polymerization method for preparing P3HT/Bi2MoO6 hybrid optical catalyst. When the conductive polymer P3HT loading is 0.75wt%, P3HT/Bi2MoO6 composite photocatalyst has the best photocatalytic activity. The concept of rate constant of P3HT/Bi2MoO6 (0.066min-1) is 1.6 times compared with the pure Bi2MoO6 samples (0.041min-1). In this paper, the mechanism of enhanced photocatalytic activity was also analyzed in detail, which provides a research way to improve the photocatalytic activity.PT/Bi2MoO6 nanocomposite was prepared by in situ polymerization of PT. When PT loading amount is lwt%, the photocatalytic activity is the best. At the same time, the mechanism of enhancing the activity of the composite photocatalyst was also put forward. The hole of valence band of Bi2MoO6 can be migrated to the HOMO level of PT, so as to realize the rapid separation of electrons and holes, to improve the photocatalytic efficiency of PT/Bi2MoO6.