Full
Outline
A novel exogenous oxidant-free Fenton-like reaction system based on vacuum ultraviolet (VUV)/Fe2+/oxalic acid (Ox) was constructed and applied to the degradation of azo dye Acid Red G (ARG). Results indicated that this system enabled the dynamic release of H2O2, which further reacts with Fe2+ to trigger Fenton-like reactions, and maintained high reactivity over a wide pH range. Experimental data showed that under the conditions of initial ARG concentration of 60mg/L, Fe2+ concentration of 0.06mmol/L and Ox concentration of 0.7mmol/L, the ARG removal efficiency by the VUV/Fe2+/Ox system reached 96.2% within 5min, and the degradation process fitted well with the pseudo-first-order kinetic model. With the increase of initial solution pH, the ARG removal efficiency exhibited a decreasing trend. Even at pH=7, the first-order rate constant k still reached 0.454min-1, which was 69.6% of that at pH=3, demonstrating that the system could retain high reactivity under neutral conditions. During the initial 5min of the reaction, the concentration of H2O2 in the system gradually increased to a maximum of 62.5μmol/L, then decreased slowly and remained at 51.8μmol/L at 9min. Free radical trapping experiments and the electron paramagnetic resonance (EPR) measurements collectively confirmed that hydroxyl radicals (·OH) and superoxide radicals (O2·-) were the dominant reactive oxygen species (ROS). In addition, common inorganic anions in aqueous environments (HCO3-, NO3-, Cl-, SO42-) all inhibited ARG degradation to varying degrees. Analysis via UV-visible absorption spectroscopy and liquid chromatography-mass spectrometry (LC-MS) revealed that ROS generated during the degradation process attacked the azo bonds and benzene ring structures in the ARG molecule, thereby achieving decolorization and removal of the dye.
85
10
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
