纳米片自组装的(BiO)2CO3单分散微米绒球的绿色可控合成及其光催化性能

Facile Green Synthesis of Highly Monodisperse Bismuth Subcarbonate Micropompons Self-assembled by Nanosheets: Improved Photocatalytic Performance

This work reports a controlled green synthesis of highly monodisperse bismuth subcarbonate (BS) micropompons self-assembled by nanosheets using a simple and facile hydrothermal route in which deionized water, bismuth nitrate pentahydrate (BNP), and urea were used as the solvent, bismuth source, and carbon source respectively. Trisodium citrate dihydrate (TCD) was used as a coordination agent to fabricate a complex precursor. The structure and morphology of the BS materials can be finely modulated by adjusting the initial concentration ratios of the reactants or the reaction time. The presence of TCD decreased the formation rate of BS due to a direct competitive interaction for the BiO⁺ ions between a coordination equilibrium and a precipitation equilibrium. Urea played a crucial role (e.g., carbon source, alkaline source, morphology control agent, and crystal growth control agent) in the formation of the BS microstructures. We obtained three kinds of BS crystals with preferred orientations along 001], 110], and 013] by adjusting the concentration of urea. Our synthesis approach has the advantages of low cost, high reaction yields, monodisperse particles, controlled morphologies and orientations, and not requiring the use of organic solvents, templates, surfactants, high phototemperatures, and long reaction times. Particularly, when compared with those reported by other investigators, the micropompon material exhibited improved photocatalytic performance for Rhodamine B due to a unique microstructure (large specific surface area, high efficiency of photoelectric conversion, small interfacial chargetransfer resistance, and active {001} exposed facets). These results indicate a major advance in the controlled green synthesis and the application of inorganic micro-and nano-materials.