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Photocatalyst Modified with Conducting Polymer

Author: YaoQuanTong
Tutor: MaHongChao
School: Dalian University of Technology
Course: Environmental Science
Keywords: ZnO TiO2 Polyaniline Photocatalytic KN-R solution
CLC: TQ426
Type: Master's thesis
Year: 2010
Downloads: 25
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Abstract


Environmental, energy sources and materials sciences are the three key projects21thcentury. One of them is the photocatalysis using oxide semiconductor, which associatedtightly with those topics. However, enhancing the photoconversion effieiency, maximizing therate of photoinduced charge separation, and extending the photoresponse of thesemiconductor catalyst into the visible range continue to be still pose a major challenge to thescientific community. Since1977, conducting polymers （CPs） have drawn considerableinterest because of their unusual electrical, optical and photoelectrical properties and theirnumerous applications in various fields. Because of their semiconductor energy level structurebroad absorption spectra and very high stability under irradiation of solarlight, CPs can beused to photosensitize semiconductor oxides and to obtain the novel photocatalysts responseto the visiblelight.In this paper, ZnO, TiO2were chose as the represeniative of semieonductor oxides. PANwas chose as there presentative of conducting polymers. Nanocomposties PAN/ZnO、PAN/TiO2and TiO2/PAN were synthesized by in-suit polymerization methods. The crystalsstructure, surfacemorphology, absorption spectra and the thermic stability of the productswere investigated by XRD、FT-IR、DRS、UV-Vis、TEM. The photocatalytic activities of thenanocomposites were evaluated by the degradation process of Reaetive Brilliant Blue. Thephotosensitive mechanism was also studied. The main results from those studies aresummarized as follow:1. Preparation of composite based on PAN/ZnO and study on its photocatalytic property.PAN/ZnO nanocomposite was synthesized by in-suit polymerization methods. Thephotocatalytic activity of products was evaluated by the degradation of KN-R. Compare withpure ZnO, the IR absorbability of PAN/ZnO shifted slightly to the lower wavenurnber. Underthe UV irradiation, the photocatalytic property of this composite was tested and comparedwith that of pure nanometer ZnO. The results indicated that after irradiating3hours thedecolorization proportion of KN-R was26.92%by using composite, which was much largerthan23.53%by using pure nanometer ZnO. Under the sunlight irradiation after3hours, decolorization proportion of KN-R was12%by using composite, which was also much largerthan6.9%by using pure nanometer ZnO.2. Preparation of composite based on PAN/TiO2and study on its photocatalytic property.PAN/TiO2nanocomposite was synthesized by in-suit polymerization methods. Thephotocatalytic activity of products was evaluated by the degradation of KN-R. Compare withpure TiO2, the IR absorbability of PAN/TiO2shifted slightly to the lower wavenurnber. Underthe UV irradiation, the photocatalytic property of this composite was tested and comparedwith that of pure nanometer TiO2. The results indicated that after irradiating3hours thedecolorization proportion of KN-R was40.66%by using composite. Under the sunlightirradiation after3hours, decolorization proportion of KN-R was18.1%by using composite,which was also much larger than by using pure nanometer TiO2.3. Preparation of composite based on TiO2/PAN and study on its photocatalytic property.TiO2/PAN nanocomposite was synthesized by in-suit polymerization methods. Thephotocatalytic activity of products was evaluated by the degradation of KN-R. Compare withpure TiO2, the IR absorbability of TiO2/PAN shifted slightly to the lower wavenurnber. Underthe UV irradiation, the photocatalytic property of this composite was tested and comparedwith that of pure nanometer TiO2. The results indicated that after irradiating3hours thedecolorization proportion of KN-R was30%by using composite. Under the sunlightirradiation after3hours, decolorization proportion of KN-R was20.45%by using composite,which was also much larger than by using pure nanometer TiO2.

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst )
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