Key Laboratory for Green Chemical Process of Ministry of Education and Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Wuhan Institute of Technology, Xiongchu Avenue, Wuhan 430073, PR China.
J Colloid Interface Sci. 2013 Nov 1;409:43-51. doi: 10.1016/j.jcis.2013.07.068. Epub 2013 Aug 11.
A facile microwave irradiation method has been successfully developed for the controllable fabrication of BiOX (X=Cl, Br, I) nanostructures in mannitol solution. The morphology and size of BiOX nanostructures could be readily tailored by adjusting the amount of halide, reaction precursor, and mannitol concentration. Mannitol molecule acts as both a capping agent and a cohesive agent in the formation of BiOX nanostructures. A possible two-stage formation mechanism was discussed based on the morphology evolution of BiOI nanostructures obtained in mannitol solution with different concentrations. The as-synthesized BiOX nanostructures exhibit much higher photocatalytic activities than that of commercial TiO2. In particular, flower-like BiOX hierarchical nanostructures display the best photocatalytic performance, which is mainly ascribed to their unique hierarchical structure, high BET surface area, and large band gap. Moreover, BiOX nanostructures also demonstrate superior Cr(VI) removal capacity. The Cr(VI) adsorption behavior was also analyzed by the Langmuir and Freundlich adsorption isotherms.
一种简便的微波辐射方法被成功开发出来，用于在甘露醇溶液中可控地制备 BiOX（X=Cl、Br、I）纳米结构。通过调节卤化物、反应前体和甘露醇浓度的量，可以轻易地调整 BiOX 纳米结构的形态和尺寸。甘露醇分子在 BiOX 纳米结构的形成过程中既充当了封端剂，又充当了粘结剂。根据在不同浓度甘露醇溶液中获得的 BiOI 纳米结构的形态演变，讨论了一种可能的两阶段形成机制。合成的 BiOX 纳米结构表现出比商业 TiO2 更高的光催化活性。特别是，花状 BiOX 分级纳米结构表现出最好的光催化性能，这主要归因于其独特的分级结构、高 BET 表面积和大带隙。此外，BiOX 纳米结构还表现出优异的 Cr(VI)去除能力。还通过 Langmuir 和 Freundlich 吸附等温线分析了 Cr(VI)的吸附行为。
