College of Architecture & Environment, Sichuan University, Chengdu 610065, China.
College of Architecture & Environment, Sichuan University, Chengdu 610065, China; Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
J Hazard Mater. 2022 Feb 15;424(Pt B):127506. doi: 10.1016/j.jhazmat.2021.127506. Epub 2021 Oct 14.
This study proposes a method to activate O by accelerating the corrosion process for zero-valent zinc (ZVZ) with the assistance of Cu(II), promoting the consecutive production of reactive oxygen species. The mechanisms for reactive oxygen species generation are clarified with metronidazole (MTZ) as the targeted pollutant. The outcome suggests the association of Cu(Ⅱ) and ZVZ presents an apparent cooperative activity, an enhancement of 85% in MTZ removal is attained for the ZVZ/Cu(Ⅱ) system after 10 min compared to that for ZVZ. Analysis of the mechanisms involved indicates that this improvement is due to the addition of Cu(Ⅱ), which can accelerate the corrosion of ZVZ. In addition, quenching experiments and electron paramagnetic resonance (EPR) technology show that superoxide radicals (·O) result in rapid MTZ degradation. The primary component that is liable for O activation and a certain amount of HO generation is verified to be ZVZ. Moreover, Cu(I) is detected in the ZVZ/Cu(Ⅱ) system, which arises from a direct reduction pathway driven by ZVZ and an indirect reduction pathway driven by active hydrogen atoms.
本研究提出了一种通过 Cu(II) 加速零价锌 (ZVZ) 的腐蚀过程来激活 O 的方法，促进了活性氧物质的连续生成。以甲硝唑 (MTZ) 为目标污染物，阐明了活性氧物质生成的机制。结果表明，Cu(Ⅱ)和 ZVZ 的结合表现出明显的协同活性，ZVZ/Cu(Ⅱ)系统在 10 分钟后 MTZ 的去除率比 ZVZ 提高了 85%。对涉及的机制进行分析表明，这种改善归因于添加 Cu(Ⅱ)，它可以加速 ZVZ 的腐蚀。此外，猝灭实验和电子顺磁共振 (EPR) 技术表明，超氧自由基（·O）导致 MTZ 快速降解。验证了 ZVZ 是 O 激活和一定量 HO 生成的主要成分。此外，在 ZVZ/Cu(Ⅱ) 体系中检测到 Cu(I)，它源于 ZVZ 驱动的直接还原途径和活性氢原子驱动的间接还原途径。
