Preparation Of Conjugated Polymer/Fe₂O₃ Nanomaterial And Their Photocatalytic Properties

Conjugated polymer and their derivatives have shown great promises due to their high absorption coefficients in the visible part of the spectrum, high mobility of charge carriers and good stability. Recently, composites of conjugated polymers with inorganic semiconductor are an emerging area of research for photoelectric conversion because they may be able to combine the unique properties of the two materials. In this article, a series of highly reactive nano-composites (Fe₂O₃/PFD,α-Fe₂O₃/PF,α-Fe₂O₃/PFA) were successfully prepared via a two-step method of polymerization and heat conversion and the materials were characterized by varies techniques in regard to their size, structure and UV-Vis absorption property. And their photocatalytic activities were evaluated by photocatalytic degradation of dye methylene blue (MB) solution as model reaction under the natural light and room temperature.This thesis mainly consists of following three major aspects.1 . A series of nanocomposites(Fe₂O₃/PFD,α-Fe₂O₃/PF,α-Fe₂O₃/PFA) were successfully prepared via a two-step method of polymerization and heat conversion. The samples were characterized through TG-DTA, TEM, XRD, XPS, IR and UV-Vis techniques. The results showed that the particle size was nanometer. The doping of polymer could extend the photo-response of Fe₂O₃ to the whole UV-Vis region.2.Structural characterization results revealed that, during the process of a proper heat treatment, the lenth of conjugated chains or the degree of unsaturation of the polymer increase in the complex. The existence of polar group can lead to asymmetric electron structure and enhance the separation efficiency of electron and hole pairs, which is advantageous for improving the activity of complex photocatalyst.3.These materials, obtained by treating the precursor at optimum conditions, could be fully decolorized within 25 minutes or shorter time under the natural light and room temperature while the decolorizing efficiency only reach 5.77 % over Fe₂O₃ nanoparticles under the same conditions. And these nanosized catalysts were stable and easily separated, avoiding second pollution.