College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, 410082 Hunan, PR China.
College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, 410082 Hunan, PR China.
J Hazard Mater. 2021 Jul 15;414:125448. doi: 10.1016/j.jhazmat.2021.125448. Epub 2021 Feb 16.
To decrease the adverse environmental and health-related effects of antibiotics, a series of MnFeO-Au (MFO-Au) composites were prepared by simple co-precipitation and photoreduction methods for efficient photo-Fenton degradation of tetracycline (TC). The synergistic effect of MFO and gold nanoparticles (AuNPs) with high absorption of visible light and strong photogenerated carrier separation efficiency endowed MFO-Au an outstanding photo-Fenton catalytic performance for TC degradation in neutral condition. The surface hydroxyl of MFO profited to generation of •OH, and negative charged or partially polarized AuNPs benefited to adsorption of HO, which had a synergistic effect on enhancing the photo-Fenton catalytic performance of MFO-Au. 88.3% of TC was efficiently removed and about 51.9% of TOC decreased within 90 min. The electron spin resonance and quenching tests suggested that h and e were responsible for the high catalytic degradation and •OH and •O participated in the photo-Fenton reaction. The toxicity assessment by seed germination experiments showed efficient toxicity reduction of this system. Besides, MFO-Au exhibited high stability, good cycle, relatively economical and practical application performance, which is expected to provide potential guidance for the design and combination of noble nanoparticles with high stability and spinel bimetallic oxides with high catalytic activity in photo-Fenton reactions.
为了降低抗生素对环境和健康的不利影响，采用简单的共沉淀和光还原法制备了一系列 MnFeO-Au（MFO-Au）复合材料，用于高效光芬顿降解四环素（TC）。MFO 和具有高光吸收和强光生载流子分离效率的金纳米粒子（AuNPs）的协同效应赋予了 MFO-Au 在中性条件下对 TC 降解的出色光芬顿催化性能。MFO 的表面羟基有利于生成•OH，带负电荷或部分极化的 AuNPs 有利于 HO 的吸附，这对增强 MFO-Au 的光芬顿催化性能具有协同作用。在 90 分钟内，TC 的去除率高达 88.3%，TOC 减少了约 51.9%。电子顺磁共振和猝灭实验表明，h 和 e 是高催化降解的原因，而•OH 和•O 参与了光芬顿反应。通过种子发芽实验进行的毒性评估表明，该体系具有高效的毒性降低作用。此外，MFO-Au 表现出高稳定性、良好的循环性、相对经济实用的应用性能，有望为设计和组合具有高稳定性的贵金属纳米粒子和具有高催化活性的尖晶石双金属氧化物在光芬顿反应中提供潜在的指导。
