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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Hierarchically grown CdS/α-Fe_2O_3 heterojunction nanocomposites with enhanced visible-light-driven photocatalytic performance
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Hierarchically grown CdS/α-Fe_2O_3 heterojunction nanocomposites with enhanced visible-light-driven photocatalytic performance

机译：具有增强的可见光驱动光催化性能的分层生长CdS /α-Fe_2O_3异质结纳米复合材料

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摘要

Wide spectral responsive 3D hierarchical CdS/α-Fe_2O_ 3 heterojunction nanocomposites were synthesized through a facile chemical bath method under mild conditions, and used for the reduction of Cr(vi) into Cr(iii) under visible light irradiation. The effects of CdS/α-Fe_2O_3 molar ratio in the nanocomposites on the crystal phases, microstructures, optical absorption properties, and photocatalytic reduction of Cr(vi) were investigated comparatively. It was found that the as-synthesized CdS/α-Fe_2O_3 nanocomposites with a suitable CdS content (e.g., the molar ratio of Fe:Cd = 1.25:3) had not only high visible-light-driven photocatalytic activity in the Cr(vi) reduction, but also good photocatalytic stability. The enhanced photocatalytic activity can be ascribed to some CdS nanoparticles closely contacting the α-Fe_ 2O_3 microflowers to form a heterojunction structure. These tight heterojunctions of the photocatalysts result in an efficient electron-hole pairs separation at the interface, followed by fast diffusion of photogenerated charge between CdS and α-Fe_2O_3, which is beneficial for separating the photogenerated carriers in space and improving the photocatalytic activity.
机译：在温和的条件下，通过简便的化学浴法合成了具有宽光谱响应的3D分层CdS /α-Fe_2O_3异质结纳米复合材料，并将其用于在可见光照射下将Cr（vi）还原为Cr（iii）。比较研究了纳米复合物中CdS /α-Fe_2O_3摩尔比对Cr（vi）的晶相，微观结构，光吸收性质和光催化还原的影响。发现具有适当CdS含量（例如Fe：Cd的摩尔比= 1.25：3）的合成后的CdS /α-Fe_2O_3纳米复合材料不仅具有较高的可见光驱动的Cr（vi ）还原，而且有良好的光催化稳定性。增强的光催化活性可以归因于一些紧密接触α-Fe_2O_3微花以形成异质结结构的CdS纳米粒子。光催化剂的这些紧密的异质结导致界面处有效的电子-空穴对分离，然后使CdS和α-Fe_2O_3之间的光生电荷快速扩散，这有利于分离空间中的光生载流子并提高光催化活性。

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