Research On The Visible Light Photocatalytic Propertiy And Near-infrared Shielding Of Potassium Tungsten Bronze Nanomaterials

With the continuous development of society,the deterioration of the ecological environment and the depletion of traditional energy are becoming more and more serious.It has attracted wide attention from all countries in the world.The appearance of tungsten bronze materials provides a new way to solve the problem of energy and environmental protection effectively.Tungsten bronze has an important application value in environmental purification,sensor and smart window because of its properties Application of tungsten bronze materials in smart windows is an effective way of building energy efficiency.Tungsten bronze based photocatalytic materials can be used to degrade pollutants in air and water by photocatalysis,which is beneficial to environmental protection.In recent years,the near-infrared barrier properties and photocatalytic properties of tungsten bronze have gradually become a hot spot.On the one hand,the principle of near infrared barrier property of tungsten bronze is that the material absorbs near infrared light due to surface plasmon resonance.However,there is no report on the factors affecting the surface plasmon resonance effect of tungsten bronze;on the other hand,visible light is 43%of the total solar energy,However,the visible light photocatalytic properties of tungsten bronze materials have not been reported..In this paper,potassium tungsten bronze nanomaterials and potassium tungsten bronze matrix composites were prepared.The composition and structure of the materials were characterized,and the visible light photocatalytic properties,near infrared light barrier properties and heat insulation properties were studied.The specific contents include the following parts.?1?Potassium tungsten bronze was prepared by solvothermal method.The effect of tungsten chloride concentration on the morphology of potassium tungsten bronze was studied.The visible light photocatalytic properties,near infrared light barrier properties and heat insulation properties of different morphologies of potassium tungsten bronze were studied.When the concentration of tungsten chloride is 15mg/m L,20mg/m L and 25mg/m L respectively,the morphology of potassium tungsten bronze is spindle shaped,microspheric and flower like.The microspheroidal potassium tungsten bronze exhibited the highest photocatalytic activity under visible light,and RhB degraded 77%after visible light irradiation at 2h.The near infrared light barrier properties are as follows:the spindle shape,the microsphere,the petal shape,the near infrared light barrier of the spindle shaped potassium tungsten bronze film is 59.08%,and the heat insulation temperature difference is 7.1?.?2?K_0.3WO₃/Ag₂O composites were prepared by chemical precipitation method.The effects of the silver oxide load on the visible light photocatalytic properties,near infrared light barrier properties and thermal insulation properties of the composites were investigated.With the increase of Ag₂O load,the visible light photocatalytic properties of the composite gradually increased,and the degradation rate of RhB increased from 11.8%to 98%after visible light irradiation.With the increase of Ag₂O loading,the near infrared light barrier ratio of composites decreased from 59.08%to 29.22%,and the thermal insulation temperature difference decreased from 7.1 to 2.3?.?4?K_0.3WO₃/Ag composites were prepared by chemical reduction method.The visible light photocatalytic properties,near infrared light barrier properties and thermal insulation properties of the composites were studied.The visible light photocatalytic performance of the composite was enhanced by the load Ag.When the theoretical load of Ag was 1wt%,the visible light photocatalytic performance of the composite was the best.After the visible light irradiation,the RhB was degraded by 92.9%.With the increase of Ag loading,the near infrared light barrier rate of composites decreased,the lowest being 49.47%,and the minimum heat insulation temperature difference was 4.7?.