Department of Chemical Engineering, National Institute of Technology Karnataka, Surathkal, Srinivasanagar Post, Mangalore, Karnataka, 575025, India.
Environ Sci Pollut Res Int. 2021 Mar;28(10):12144-12152. doi: 10.1007/s11356-020-10879-w. Epub 2020 Oct 2.
Narrow band gap of ferrites makes it a good photocatalyst, and it plays very prominent role in the level of degradation of organic dyes by photocatalysis. In the current study, bismuth ferrite (BFO) nanoparticles were synthesized by auto-combustion technique. The synthesized BFO particles have the average crystallite size of 33 nm and band gap energy of 1.9 eV. As revealed by microscopic images, uniform, distinct, and hexahedral shaped BFO nanoparticles of 42.7 nm are formed. The BFO nanoparticles exhibited visible and solar light-mediated photocatalytic activity in degrading Acid Yellow-17. The optimum pH and catalyst loading were found to be pH 5 and 0.2 g/L respectively. Around complete degradation under solar and 95% degradation under visible light could be achieved within 135 min of irradiation. Around 85% and 83% chemical oxygen demand (COD) removal could also be achieved under solar and visible light respectively. The degradation followed first-order kinetics in terms of COD removal. The BFO nanoparticles are promising as solar light active catalysts for wastewater treatment.
铁氧体的窄带隙使其成为一种良好的光催化剂，在光催化有机染料降解方面发挥着非常突出的作用。在本研究中，采用自燃烧技术合成了铋铁氧体（BFO）纳米粒子。合成的 BFO 颗粒具有平均晶粒尺寸为 33nm 和带隙能为 1.9eV。微观图像显示，形成了 42.7nm 均匀、明显和六面体形状的 BFO 纳米粒子。BFO 纳米粒子在降解酸性黄 17 方面表现出可见光和太阳光介导的光催化活性。发现最佳 pH 值和催化剂负载量分别为 pH5 和 0.2g/L。在 135 分钟的辐照下，在太阳光下可以达到完全降解，在可见光下可以达到 95%的降解。在太阳光和可见光下，化学需氧量（COD）去除率分别达到约 85%和 83%。降解遵循 COD 去除的一级动力学。BFO 纳米粒子有望成为用于废水处理的太阳光活性催化剂。
