Bismuth oxybromide (BiOBr) was synthesized in aqueous medium in presence of EDTA as structure-directing agent following a simple coprecipitation method at 23 °C and by microwave irradiation at 110 °C. The physicochemical properties of BiOBr (morphology, specific surface area, energy band gap and photocatalytic activity) were modified using different EDTA concentrations. Nanoparticles of BiOBr with {1 1 0} crystallographic exposed facets were obtained as a peculiar feature of the synthesis followed. The photocatalytic activity of BiOBr was evaluated in the oxidation reaction of nitric oxide (NO) in gaseous phase under UV–Vis and visible irradiation. An enhancement in the NO conversion degree was reached for BiOBr synthesized by coprecipitation with an EDTA/Bi molar ratio of 0.6. This sample showed a NO conversion degree of 94%, a selectivity to nitrate ions of 98%, a good stability after four cycles of irradiation and sample was able to retain its high photocatalytic activity under humidity conditions (70% RH). The use of different chemical scavengers revealed that superoxide radical (O₂^•-) was the main reactive specie in the mechanism of the photocatalytic reaction. BiOBr photocatalyst was successfully incorporated in two formulations of ceramic coatings to develop prototypes of building materials with active surface for the photocatalytic elimination of NO_x gases from the air.

按照简单的共沉淀方法，在23°C并在110°C的微波辐射下，在EDTA作为结构导向剂的情况下，在水性介质中合成了溴化铋（BiOBr）。BiOBr的理化性质（形态，比表面积，能带隙和光催化活性）使用不同的EDTA浓度进行了修改。获得具有{1 1 0}晶体学暴露的小平面的BiOBr纳米颗粒，作为随后合成的独特特征。在UV-Vis和可见光照射下，气相中一氧化氮（NO）的氧化反应中评估了BiOBr的光催化活性。通过EDTA / Bi摩尔比为0.6的共沉淀合成的BiOBr达到了NO转化率的提高。该样品的NO转化率为94％，对硝酸根离子的选择性为98％，经过四个辐射周期后具有良好的稳定性，并且样品能够在潮湿条件（70％RH）下保持其高光催化活性。使用不同的化学清除剂后发现超氧自由基（O₂ ^•-）是光催化反应机理中的主要反应物种。BiOBr光催化剂成功地掺入了两种陶瓷涂料配方中，从而开发出具有活性表面的建筑材料原型，用于光催化消除空气中的NO _x气体。