Flower-like bismuth oxybromide (BiOBr) microspheres with highly controllable morphology and photocatalytic activity were facilely synthesized in ethanol using Bi(NO₃)₃·5H₂O and NaBr. The effects of solvothermal conditions on the morphology and composition were investigated and a mechanism for the microsphere formation was proposed. The temperature and pH of the solvothermal reaction had little effect on morphology but a large effect on visible light photocatalytic activity, which was attributed to changes in the facet intensity ratio, I_110/102. Microspheres prepared at 140 °C and pH = 7 had the highest I_110/102 ratio and degraded Rhodamine B (RhB) more rapidly than other BiOBr preparations. The (110) plane has surface Bi^3 + sites that coordinate with the carboxylate anion of RhB, thus increasing adsorption but also a stronger internal electric field (IEF) that increases e⁻-h⁺ separation efficiency. These findings provide a better understanding of the effects of solvothermal conditions on the crystal growth and activity of semiconductor photocatalysts.

利用Bi（NO ₃）₃ ·5H ₂ O和NaBr在乙醇中容易地合成了具有良好可控形貌和光催化活性的花状氢溴酸铋（BiOBr）微球。研究了溶剂热条件对形貌和组成的影响，并提出了形成微球的机理。溶剂热反应的温度和pH值对形态几乎没有影响，但对可见光光催化活性的影响很大，这归因于刻面强度比I _{110/102的变化}。在140°C和pH = 7的条件下制备的微球的I _110/102最高与其他BiOBr制剂相比，其比值和降解的若丹明B（RhB）更快。的（110）面具有表面的Bi ^{3 +}位点与罗丹明B的羧酸根阴离子坐标，从而增加了吸附也更强的内部电场（IEF），该增加Ë ^- - ħ ⁺分离效率。这些发现为溶剂热条件对晶体生长和半导体光催化剂活性的影响提供了更好的理解。