Abstract

The development of simple and cost-effective photocatalytic materials in the treatment of effluents containing organic compounds is of extreme importance. This work evaluated the influence of fluoride ions on the synthesis of spray-dried Nb₂O₅/Carbon Xerogel composites. The material processed in the system with high fluoride concentration showed the presence of hexagonal NbO₂F and Nb₂O₅ crystalline phases, whereas the material synthesized in lower fluoride concentration showed mainly the Nb₂O₅ phase_. The higher content of the fluoride was detrimental to the adsorption capacity of the material and resulted in a significant reduction in the photocatalytic activity of spray-dried materials, probably due to the significant reduction in the specific surface area observed.

摘要

在处理含有机化合物的废水中，开发简单且具有成本效益的光催化材料极为重要。这项工作评估了氟离子对喷雾干燥 Nb ₂ O ₅ /碳干凝胶复合材料合成的影响。在高氟化物浓度体系中处理的材料显示存在六方NbO ₂ F和Nb ₂ O ₅晶相，而在较低氟化物浓度下合成的材料主要显示Nb ₂ O ₅相_。较高含量的氟化物不利于材料的吸附能力，并导致喷雾干燥材料的光催化活性显着降低，这可能是由于观察到的比表面积显着降低所致。