School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Xinxiang, Henan 453007, PR China.
School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Xinxiang, Henan 453007, PR China.
Bioresour Technol. 2020 Jul;307:123183. doi: 10.1016/j.biortech.2020.123183. Epub 2020 Mar 16.
Humic acid (HA) was applied as the biosorbent for the adsorption and degradation of dyes in the presence of environmentally persistent free radicals (EPFRs). Scanning Electron Microscope (SEM) analysis showed that the microstructure of the HA surface and the thermal stability was analyzed by thermogravimetric analysis (TGA). Following irradiation, semiquinone EPFRs (g-factor > 2.0045) were generated on the HA surface. Both O and the addition of HO were able to promote the generation of hydroxyl and superoxide radicals for the degradation of dye in aqueous solution. Furthermore, adsorption was observed to remove large amounts of the dyes, while the instantaneous free radical degradation process reduced the dyes to the lower concentration. In addition, a linear relationship was observed between the consumption of EPFRs and dye degradation rates. In ternary systems, HA conformed to Langmuir (476.19-1250.12 mg/L) and pseudo-second-order kinetic models. This work offers new insights into HA-EPFRs and their potential applications.
腐殖酸 (HA) 被用作吸附剂，在环境持久性自由基 (EPFRs) 的存在下吸附和降解染料。扫描电子显微镜 (SEM) 分析表明，腐殖酸表面的微观结构和热稳定性通过热重分析 (TGA) 进行了分析。辐照后，腐殖酸表面生成了半醌 EPFRs（g 因子>2.0045）。O 和 HO 的添加都能够促进羟基和超氧自由基的生成，从而降解水溶液中的染料。此外，吸附被观察到能够去除大量染料，而瞬时自由基降解过程将染料降低到较低的浓度。此外，还观察到 EPFRs 的消耗与染料降解速率之间存在线性关系。在三元体系中，腐殖酸符合朗缪尔（476.19-1250.12mg/L）和准二级动力学模型。这项工作为腐殖酸-EPFRs 及其潜在应用提供了新的见解。
