The Properties Of Fe₂O₃-CuO Semiconductor Materials For Photocatalytic HCO₃^- To CH₃OH

The excessive utilization of fossil fuels has brought two major issues:energy crisis and Greenhouse effect.Photocatalytic reduction of CO₂ to CH₃OH using semiconductor photocatalytic materials is a promising avenue to reduce CO₂ emission and to produce value-added chemical fuels,which is one of the effective methods to realize the carbon cycle.The photocatalytic reduction of CO₂ needs high activation energy,HCO₃^-?CO₂'s secondary product in the alkaline solution?is used as the carbon source of CO₂ photoreduction.In this paper,In order to improve the photocatalytic performance of Fe₂O₃ materials from two method of the energy band and the separation efficiency of photogenerated electron hole,Fe₂O₃-CuO series materials were synthesized by high energy ball mill method.The samples were characterized by XRD,SEM and Photoelectrochemical test to investigate the Structure,morphology photocatalytic activity,the photogenerated carrier separation efficiency and Energy band structure.The main content was as following:?1?Fe₂O₃-CuO series materials were successfully synthesized by high-energy ball milling.The grain size of the samples were nanoscale.With the increase of milling time,the crystal phase of CuO gradually decreased.?2?The photocatalytic reduction of HCO₃^-using Fe₂O₃-CuO series materials catalysts to CH₃OH have been investigated.,the results showed that the photocatalytic performance of the material decreases with increasing CuO ratio.The photocatalytic performance of Fe₂O₃-CuO materials decreased with the increase of milling time.Ball milling 20h Fe₂O₃-CuO material 1 performed the highest photocatalytic activity,the yield of methanol was 1.1 mmol·(g_cat)^-1,and the photocatalytic performance of the Fe₂O₃ material was improved by 2.82 times.?3?The results of photocatalytic reduction of HCO₃^-to methanol using ball milling 20h Fe₂O₃-CuO material 1 under fluorescent lamp and LED lamp show that the light absorption range of the synthesized material is more matched with the spectrum of the fluorescent lamp,which leads to this photocatalytic performance is better.At the same time,with the increase of light time,the photocatalytic suspension system has the problem of oxidation product methanol.?4?The results show that the open circuit potential of ball milling 20h Fe₂O₃-CuO material1 is the largest and its photocatalytic performance is the best.?5?Dark and irradiant i-t curve represented the efficiency of photogenerated electron-hole pair separation,the photocurrent in descending order:Fe₂O₃-CuO material 1>Fe₂O₃-CuO material 2>Fe₂O₃-CuO material 3>Fe₂O₃>Fe₂O₃-CuO material 4.The results are in good agreement with the results of photocatalytic performance experiments,indicating that the prepared Fe₂O₃-CuO material effectively enhances the photocatalytic activity.?6?The results of the flat band potential test show that the synthesized Fe₂O₃-CuO series material can improve the conduction band of Fe₂O₃ and enhance the reduction ability,the photocatalytic performance of Fe₂O₃ is greatly improved.