International Center for Materials Nanoarchitectonic and Photocatalytic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
Chemistry. 2011 Apr 26;17(18):5145-54. doi: 10.1002/chem.201002229. Epub 2011 Mar 22.
A facile solvothermal epitaxial growth combined with a mild oxidation route has been developed for the fabrication of a magnetically recyclable Fe(3)O(4)/WO(3) core-shell visible-light photocatalyst. In this core-shell structured photocatalyst, visible-light-active WO(3) nanoplates (the shells) with high surface area are used as a medium to harvest absorbed photons and convert them to photogenerated charges, while conductive Fe(3)O(4) microspheres (the cores) are used as charge collectors to transport the photogenerated charges. This is a new role for magnetite. The Fe(3)O(4)/WO(3) core-shell structured photocatalysts possess large surface-exposure area, high visible-light-absorption efficiency, stable recyclability, and efficient charge-separation properties, the combination of which has rarely been reported in other visible-light-active photocatalysts. Photoelectrochemical investigations verify that the core-shell structured Fe(3)O(4)/WO(3) has a more effective photoconversion capability than pure WO(3) or Fe(3)O(4). At the same time, the visible-light photocatalytic ability of the Fe(3)O(4)/WO(3) photocatalyst has significantly enhanced activity in the photodegradation of organic-dye materials. The results presented herein provide new insights into core-shell materials as high-performance visible-light photocatalysts and their potential use in environmental protection.
一种简便的溶剂热外延生长方法与温和的氧化途径相结合，已被开发用于制造可磁回收的 Fe(3)O(4)/WO(3)核壳可见光光催化剂。在这种核壳结构的光催化剂中，具有高表面积的可见光活性 WO(3)纳米片（壳）被用作吸收光子的介质，并将其转化为光生电荷，而导电 Fe(3)O(4)微球（核）则被用作传输光生电荷的电荷收集器。这是磁铁矿的一个新角色。Fe(3)O(4)/WO(3)核壳结构光催化剂具有大的暴露表面积、高可见光吸收效率、稳定的可回收性和有效的电荷分离性能，这些特性的结合在其他可见光活性光催化剂中很少见。光电化学研究验证了核壳结构的 Fe(3)O(4)/WO(3)比纯 WO(3)或 Fe(3)O(4)具有更高的光电转换能力。同时，Fe(3)O(4)/WO(3)光催化剂的可见光光催化能力在有机染料材料的光降解方面显著提高了活性。本文的研究结果为核壳材料作为高性能可见光光催化剂及其在环境保护中的潜在应用提供了新的见解。
