Research On Full Spectrum Photocatalysis Performance And Near-infrared Shielding Performance Of Fluorine Doped Ammonium Tungsten Bronze-based Composites

How to Reduce the environmental pollution and energy consumption has become the important directions for sustainable development.Due tothe special composition and structure,tungsten bronze materials with high visible light transmittance and good near-infrared light shielding performancehave widely used for building energy conservation.In recent years,tungsten bronze has been developed into photocatalytic materials with full solar spectral response by ion doping.Therefore,tungsten bronze materials have show great potential for building energy saving and environment remedy.Thedevelopment of tungsten bronze-based composite materials with superior full solar spectrum photocatalytic activity and strong near-infrared blocking performance has great value.In this thesis,the full spectrum photocatalytic properties and near-infrared barrier properties of fluorine-doped ammonium tungsten bronze were enhaced by loading of Au and compositing of semiconductors..fluorine-doped ammonium tungsten bronze/gold nanoparticles(FW-Au NPs)composites,fluorine-doped ammonium tungsten bronze/gold nanorods(FW-Au NRs)composites and fluorine-doped ammonium tungsten bronze/copper sulfide(FW-CuS)compositewere prepared.The influence of the morphology and loading amount of Au and CuS on the UV,visible and near-infrared photocatalytic properties and near-infrared barrier properties of the ammonium tungsten bronze-based composite material were explored.The main research contents and results are as follows:(1)As the theoretical loading of gold particles(Au NPs)increased from 0.5wt% to 3wt%,the UV,visible,and near-infrared photocatalytic activities of the composites increased first and then decreased.When the theoretical loading of Au NPs is 1wt%,its UV and near-infrared photocatalytic efficiency were the highest.The degradation rate of Rh B solution reached62.6% and 79.5%,respectively.When the theoretical loading of Au NPs is 2wt%,the visible light photocatalytic efficiency was the highest(95.9%).In addition,as the loading of Au NPs increased,the near-infrared shielding rate of the composite material gradually decreased,and the thermal insulation effect of the prepared film also deteriorated.(2)As the theoretical loading of Au NRs increased from 0.5wt% to 3wt%,the UV photocatalytic activity of the composite material gradually increased,while the visible light and near-infrared photocatalytic activity increased first and then decreased.When the theoretical loading of Au NRs is 3wt%,the UV photocatalytic performance of the composite material was better,and the degradation rate of the Rh B solution reached 76.8%.When the theoretical loading of Au NRs was 1wt%,the visible light and near-infrared photocatalytic properties of the composite material were the best.The corresponding degradation rate of the Rh B solution reached 97.8% and 92.2%,respectively.In addition,as the load increased,the near-infrared blocking performance and thermal insulation performance of the composite film improved gradually.When the theoretical loading of Au NRs was 3wt%,compared with the base FW,the near-infrared blocking rate of the film prepared by the composite material increased by 14.33%,and the thermal insulation temperature difference increased by 4.6°C.(3)As the theoretical compounding amount of copper sulfide(CuS)increased from5wt% to 30wt%,the UV,visible,and near-infrared photocatalytic activity and near-infrared blocking rate of the composite material increased first and then decreased.When the theoretical compounding amount of CuS is 20wt%,the composite material showed the best ultraviolet,visible and near-infrared photocatalytic performance.The corresponding degradation rate of Rh B solution reached 47.7%,65.2% and 78.2%,respectively.The near-infrared blocking rate of the composite material reached 58.17%.The loading of CuS had little influence on the thermal insulation performance of the composites.