College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.
J Colloid Interface Sci. 2017 Nov 1;505:519-527. doi: 10.1016/j.jcis.2017.06.039. Epub 2017 Jun 13.
Nanosheet constructed bismuth microspheres were prepared through an aqueous reduction approach in the presence of CTAB molecules, with initial formed BiOCl as the precursor and hydrazine hydrate as the reductant. The flower-like morphology and platelet units of BiOCl precursor determined the evolution of hierarchical Bi microspheres through a morphology-heredity process. Trisodium citrate was introduced to keep the Bi microspheres from oxidation, the high purity in composition are beneficial to eliminate the influence of bismuth oxides. Photocatalytic properties of the hierarchical Bi microspheres were investigated under visible-light irradiation by taking the degradation of rhodamine B (RhB) dye and colorless bisphenol A (BPA) as probe reactions. 99.7% of RhB and 47.4% of BPA degradation in 3h indicate good photocatalytic property of the hierarchical Bi microspheres. Results of storing detection and recycled experiments revealed good structure stability and photocatalytic stability of the Bi microspheres, these properties are vital for practical applications of the materials. The formation mechanism of Bi microspheres and relative degradation mechanism are also proposed on the basis of experimental data.
纳米片结构的铋微球是通过在 CTAB 分子存在下的水相还原法制备的，以初始形成的 BiOCl 作为前驱体，水合肼作为还原剂。BiOCl 前驱体的花状形态和片状单元决定了通过形态遗传过程来演变出分级 Bi 微球。引入柠檬酸三钠以防止 Bi 微球被氧化，高纯度的组成有利于消除氧化铋的影响。通过以罗丹明 B（RhB）染料和无色双酚 A（BPA）的降解作为探针反应，在可见光照射下研究了分级 Bi 微球的光催化性能。在 3h 内，RhB 的降解率达到 99.7%，BPA 的降解率达到 47.4%，表明分级 Bi 微球具有良好的光催化性能。储存检测和回收实验结果表明，Bi 微球具有良好的结构稳定性和光催化稳定性，这些性质对于材料的实际应用至关重要。还根据实验数据提出了 Bi 微球的形成机制和相对降解机制。
