Preparation Of Conjugated Polymer/ZnO Nanomaterial And Their Photocatalytic Properties

Owing to the band structure of the conjugated polymers similar to the inorganicsemiconductor, decorating nano-scale inorganic semiconductor with the conjugatedpolymer can extend photo response of semiconductors and improve their photovoltaicconversion and photocatalytic performance. Based on it, three kind of nanosizedconjugated polymer/ZnO composite materials (CPF/ZnO, CPFD/ZnO and CPFA/ZnO)were prepared through in-situ polymerization and heat conversion in this thesis. Thethermal stability, morphologies, size, structure and optical absorption properties of thematerial were characterized by various techniques. Their photocatalytic propertieswere evaluated by using the degradation of dye methylene blue (MB) solution asmodel reaction under the natural light.This thesis mainly consists of following three major aspects.1. A series of composite nanomaterials of conjugated polymer (CPF, CPFD andCPFA)/ZnO were successfully prepared via in-situ polymerization and heatconversion from the monomers (F, FD, FA) and ZnO.2. The thermal stability, morphologies, size, structure and optical absorptionproperties of these composite nanomaterials were characterized by TG-DTA, TEM,XRD, XPS, IR and UV-Vis techniques. Some important results were obtained. ZnOaffected the stability and structure of polymers. Proper heat treatment could not onlyincrease the length of the conjugated polymer but also form a kind of stronginteraction between the polymer and ZnO. Introducing conjugated polymer into ZnOextends the photo response of ZnO from UV to visible region.3. Approaches of synthesizing the materials and heat-treating conditions mainlyaffected the structures of polymers of composite nanomaterials, on which thephotocatalytic properties of these materials depended largely. And these materials,after properly heat treatment, exhibited extremely highly catalytic activity on thedegradation of dye Methylene Blue (MB). For example, these materials, obtained bytreating the precursor at optimum conditions, could be fully decolorized within 5~15 minutes or shorter time under the natural light while only 10 % degradation efficiencyof MB solution was only obtained on ZnO nanoparticles under the same conditions.And these nanosized catalysts with highly catalytic stability could largely mineralizethe dye MB under natural light in a short time. More significantly, they were stableand easily separated, avoiding second pollution...