Study On Controllable Preparation And Photocatalytic Performance Of Gold Nanorod @ Cu₂O Core-shell Structure

In the face of increasingly serious environmental pollution and energy shortages,photocatalytic technology has been used as a key technical means for energy conservation and environmental protection.Plasma photocatalysis,as a new branch of photocatalysis,has been widely reported recently and has become a research hotspot.The characteristic of plasma photocatalysis is the use of visible light for catalytic applications,which can greatly improve the effective use of solar energy.Based on the preparation of gold nanorods by seed solution method,the gold nanorods@Cu₂O core-shell structure was successfully constructed in this paper and used to study the performance of catalytic reduction of p-nitrophenol and catalytic oxidation of isopropanol.UV-Vis,TEM,ICP and other analytical testing methods were used to comprehensively characterize and analyze the gold nanorods and gold nanorods@Cu₂O core-shell structure.The main research results are summarized as follows:1.When preparing gold nanorods by seed solution method,gold nanorods with different aspect ratios can be prepared by controlling the content of Ag NO₃.The lateral absorption peaks of gold nanorods are about 520 nm,and the longitudinal absorption peaks can be from 575 nm,675 nm,780 nm to 850 nm,it has strong absorption in the visible-near infrared range.2.In the reaction of catalyzed reduction of p-nitrophenol by gold nanorods under light,the reaction is mainly affected by temperature.The effect of light irradiation only causes the temperature change of the water in the reaction solution to increase the activity of the reaction.The temperature change caused by gold nanorods is very small and negligible.3.In the preparation of gold nanorods@Cu₂O core-shell structure,the amount of CuCl₂ introduced is very critical.The optimal ratio is about 1:1 mass ratio of Au to Cu.4.Using gold nanorods@Cu₂O to catalyze the reduction of p-nitrophenol with sodium borohydride,the apparent activation energy of the reaction is lower than that of gold nanorods alone.Gold nanorods and gold nanorods@Cu₂O core-shell structure supported by?-Al₂O₃ for visible light catalytic reaction of isopropanol,there is no catalytic activity,and when supported on Ti O₂,the photothermal effect of gold nanorods leads to the activity of the reaction enhanced.In this paper,the academic thoughts and research ideas for constructing plasma photocatalysts based on gold nanorods and studying their catalytic performance are of great guiding significance for the construction of materials in different systems.