过氧二硫酸盐
化学
过氧化氢
过氧乙酸
电子转移
催化作用
电子传输链
反应性(心理学)
石墨
过氧化物
碳纤维
组合化学
化学工程
光化学
有机化学
材料科学
工程类
医学
生物化学
替代医学
病理
复合材料
复合数
作者
Shiqi Tian,Yuanyuan Xu,Yuexin Ma,Shu‐Heng Jiang,Jun Ma,Yingzi Lin,Gang Wen
标识
DOI:10.1016/j.cej.2024.150016
摘要
Electron transfer pathway (ETP) driven by carbon-catalytic peroxides has become appealing strategy for microcontaminants (MCs) removal, whereas the nature of ETP occurring in different peroxides system is ambiguous. This work developed a controllable model for peroxides activation by using graphite (GP) that is characterized as simple configuration and excellent electronic conductivity. Peracetic acid (PAA) and peroxymonosulfate (PMS) could be readily activated by GP with 72.2% and 93.7% removal efficiency of sulfamethoxazole, respectively, but peroxydisulfate (PDS) and hydrogen peroxide (H2O2) showed low reactivity to GP activation. For PAA/GP system, the adjacent transferring type of ETP was the primary oxidation mechanism with formation of metastable surface complexes to extract electrons from MCs; while the electron shuttling was the dominate ETP route in PMS/GP system via conductive GP acting as a bridge, promoting direct electron transport from organics to PMS and accounting for 49% oxidation efficiency at pH 7.0. Hydroxyl groups of GP were proposed to be decisive sites to form PAA-GP* complexes, while sp2-hybridized carbon functioned as the electron shuttler in PMS oxidation. Importantly, ETP process would not be affected by the coexistence of multiple anions and natural organic matter to remove mixed MCs in actual water. Our work dedicates to exploring selection of various peroxides in ETP regimes and presenting the superiority of ETP strategy to treat complicated aquatic environment.
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