The synthesis of Bi₂O₃ by a simple chemical route in the presence of polyvinylpyrrolidone (PP) as surfactant was studied. The sample was characterized by XRD, FTIR, and DRS techniques. Its pHpzc was estimated about 9.5. Crystallite size of the as-synthesized sample was estimated about 45 and 14 nm by the Scherrer and Williamson-Hall models, respectively. Band gap energy was estimated about 2.98 eV using the adsorption edge wavelength, while by using the Kubelka-Munk theory Eg-values of 3.21, 3.13, 3.27, and 3.24 eV were obtained for n-values of 2, 1/2, 3/2, and 3, respectively. The photocatalytic performance of the Bi₂O₃ NPs was evaluated against phenazopyridine as a model pollutant. Experimental optimized parameters were as adsorbent dosage = 0.7 g/L, contact time = 60 min, pH 7, illumination time: 60 min, C_PP: 20 ppm. The photocatalytic kinetics model obeyed the pseudo-first order kinetic model.

研究了在聚乙烯吡咯烷酮 (PP) 作为表面活性剂存在下，通过简单的化学途径合成 Bi ₂ O _{3 。}通过 XRD、FTIR 和 DRS 技术对样品进行了表征。其 pHpzc 估计约为 9.5。Scherrer 和 Williamson-Hall 模型分别估计合成样品的微晶尺寸约为 45 和 14 nm。使用吸附边缘波长估计带隙能量约为 2.98 eV，而通过使用 Kubelka-Munk 理论，对于 2、1/2、3/ 的 n 值，获得了 3.21、3.13、3.27 和 3.24 eV 的Eg值分别为 2 和 3。Bi ₂ O _{3的光催化性能}NPs 是针对非那吡啶作为模型污染物进行评估的。实验优化参数为吸附剂剂量 = 0.7 g/L，接触时间 = 60 分钟，pH 7，光照时间：60 分钟，C _PP：20 ppm。光催化动力学模型服从伪一级动力学模型。