Study On The Correlation Between Interfacial And Photocatalytic Properties Of PANI / Oxide Complexes

To investigate the relationship of the PANI/metallic oxide interface and the photocatalytic properties, we prepared the TiO2/PANI and Bi2O2CO3/PANI composites through electrochemical process and low-temperature chemical method. The information of the morphology, crystal structure, constitution and the chemical state was obtained based on the characterizations of XRD, SEM, TEM, ESR, XPS, BET, FT-IR. and UV-vis spectra analysis. Moreover, the results of band structure, density of state (DOS) and the electronic structure were obtained through the computational simulations. The research combining the photoelectrochemical and degradation experiments provides the effects of the interaction at the interface of PANI/metallic oxide on the photocatalytic properties on the basis of the experimental and theoretical respects.According to the research results, it is concluded as follows:(1) Concerning the TiO2/PANI composites, the visible-light optical property was not promoted while the photo-induced current enhanced2.5times than the pristine TiO2film. The results inferred that the Ti-O-N-C interaction at the interface accelerated the separation and the transfer of the carriers, which indicated the interface has a significant effect on the photocatalytic properties;(2) To investigate the relationship between interface and the photocatalytic properties, we carried out the typical two-dimensional material, Bi2O2CO3nanosheet, which is prefer to exhibited the surface characters of materials, to combine with PANI. According to the experiments and simulations, the Bi-O bonds on the surface of Bi2O2CO3were distorted or broken by PANI leading the O atoms separated, and finally generated the stable vacancy oxygen on the Bi2O2CO3surface. Due to the band structure of Bi2O2CO3alternated by the vacancy oxygen, the degradation efficiency and the photocurrent were enhanced4.5and6times, respectively;(3) On account of the results in PANI Bi2O2CO3composites, to furtherly confirm this effect exist in other organic compound, we added dodecyltrimethylammonium bromide (CTAB) during the preparation process of Bi2O2CO3and finally fabricated the interstitial nitrogen-doped Bi2O2CO3, and the depth of the nitrogen doping is about than5nm. The strategy not only enhance the degradation efficiency of N-doped Bi2O2CO3, but also provide a conventional and low-temperature preparation routine to produce nitrogen-doped bismuth oxide such as BiOCl. Moreover, the in situ FT-IR results indicated the NO oxidation routine of N-Bi2O2CO3alternated by the nitrogen doping.Thus, the interaction at the PANI/metallic oxide interface has an effect to alternate the constitution of the crystal structure, and the N-doped Bi2O2CO3obtained basing on this effect. Due to the change of the structure and constitution of the surface, the band structure was adjusted, and the separation and transfer efficiency of carriers were enhanced resulting in the promoted photocatalytic activity. The research provided a detailed investigation on the relationship between the interaction at the organic/inorganic interface and the photocatalytic property, and offered the experimental and theoretical guidance to fabricate the photocatalyst.