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首页> 外文期刊>RSC Advances >Synthesis of mesoporous TiO2-coupled Fe2O3 as efficient visible nano-photocatalysts for degrading colorless pollutants
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Synthesis of mesoporous TiO2-coupled Fe2O3 as efficient visible nano-photocatalysts for degrading colorless pollutants

机译：介孔TiO2偶联Fe2O3的合成作为有效的可见光纳米催化剂，用于降解无色污染物

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In this paper, a feasible route is developed to greatly enhance the visible photocatalytic activities of alpha-Fe2O3 nanoparticles for degrading colorless pollutants by coupling a suitable amount of mesoporous nanocrystalline anatase TiO2. Based on the atmosphere-controlled steady-state surface photovoltage spectra, transient-state surface photovoltage responses, photoelectrochemical measurements and O-2 temperature-programmed desorption, it is suggested that the coupled TiO2 with a high-level conduction band bottom would act as a high-level platform, could facilitate the uncommon spatial transfers of visible-excited energetic electrons from Fe2O3 to TiO2, and the mesoporous structure of TiO2 could promote the capture of the energetic electrons by O-2 by enhancing the O-2 adsorption. This is favorable to prolong the carrier lifetime and to promote the charge separation, leading to the obviously-enhanced visible photoactivities. The developed strategy would provide us with a simple and feasible idea to greatly improve the photocatalytic performance of visible-response oxide-based nano-semiconductors.
机译：在本文中，通过偶联适量的介孔纳米晶锐钛矿型TiO2，开发了一种可行的途径来大大增强α-Fe2O3纳米粒子对可见光的催化降解无色污染物的能力。根据大气控制的稳态表面光电压谱，瞬态表面光电压响应，光电化学测量和O-2温度程序解吸，建议具有高能级导带底部的TiO2可以作为高层平台可以促进可见光激发的高能电子从Fe2O3到TiO2的不寻常空间转移，并且TiO2的介孔结构可以通过增强O-2的吸附来促进O-2捕获高能电子。这有利于延长载流子寿命并促进电荷分离，从而导致明显增强的可见光活性。制定的策略将为我们提供一个简单可行的思路，以大大提高可见光响应氧化物基纳米半导体的光催化性能。

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