Crystal Growth Centre, Alagappa College of Technology, Anna University, Chennai, 600025, India.
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India.
Sci Rep. 2022 Mar 24;12(1):5111. doi: 10.1038/s41598-022-08966-8.
Visible-light-driven photo-fenton-like catalytic activity and photoelectrochemical (PEC) performance of nitrogen-doped brownmillerite KBiFeO (KBFO) are investigated. The effective optical bandgap of KBFO reduces from 1.67 to 1.60 eV post N-doping, enabling both enhancement of visible light absorption and photoactivity. The photo-fenton activity of KBFO and N-doped KBFO samples were analysed by degrading effluents like Methylene Blue (MB), Bisphenol-A (BPA) and antibiotics such as Norfloxacin (NOX) and Doxycycline (DOX). 20 mmol of Nitrogen-doped KBFO (20N-KBFO) exhibits enhanced catalytic activity while degrading MB. 20N-KBFO sample is further tested for degradation of Bisphenol-A and antibiotics in the presence of HO and chelating agent L-cysteine. Under optimum conditions, MB, BPA, and NOX, and DOX are degraded by 99.5% (0.042 min), 83% (0.016 min), 72% (0.011 min) and 95% (0.026 min) of its initial concentration respectively. Photocurrent density of 20N-KBFO improves to 8.83 mA/cm from 4.31 mA/cm for pure KBFO. Photocatalytic and photoelectrochemical (PEC) properties of N-doped KBFO make it a promising candidate for energy and environmental applications.
研究了氮掺杂棕钙矿型 KBiFeO（KBFO）的可见光驱动类芬顿光催化活性和光电化学（PEC）性能。氮掺杂后，KBFO 的有效光学带隙从 1.67 降低到 1.60eV，从而提高了可见光吸收和光活性。通过降解亚甲基蓝（MB）、双酚-A（BPA）和抗生素如诺氟沙星（NOX）和强力霉素（DOX）等废水来分析 KBFO 和氮掺杂 KBFO 样品的类芬顿活性。20mmol 氮掺杂 KBFO（20N-KBFO）在降解 MB 时表现出增强的催化活性。进一步在 HO 和螯合剂 L-半胱氨酸存在的条件下，对 20N-KBFO 样品进行了 Bisphenol-A 和抗生素的降解测试。在最佳条件下，MB、BPA、NOX 和 DOX 的初始浓度分别降解了 99.5%（0.042min）、83%（0.016min）、72%（0.011min）和 95%（0.026min）。20N-KBFO 的光电流密度从纯 KBFO 的 4.31mA/cm 提高到 8.83mA/cm。氮掺杂 KBFO 的光催化和光电化学（PEC）性能使其成为能源和环境应用的有前途的候选材料。
