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作 者:Wei Xiang Mingjie Huang Xiaohui Wu Fugang Zhang Dan Li Tao Zhou
机构地区:[1]School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [2]Key Laboratory of Water and Wastewater Treatment(HUST),MOHURD,Wuhan 430074,China [3]Three Gorges Base Development Co.,Ltd,Yichang 443002,China
出 处:《Chinese Chemical Letters》2022年第3期1275-1278,共4页中国化学快报(英文版)
基 金:supported by the National Natural Science Foundation of China (Nos. 21677055 and 22006045);the China Postdoctory Science Foundation (No. 2020M672361);the Project of Three Gorges Corporation (No. JD-ZC-FW-20-001)。
摘 要:This study has demonstrated an interesting amplification effect of magnetic field (MF) on the hydroxylamine (HA)-promoted zero valent iron (ZVI)/H_(2)O_(2) Fenton-like system. Sulfamethoxazole (SMX) could be efficiently degraded at near neutral pH. Conditional parameters affecting the SMX degradation in the ZVI/H_(2)O_(2)/HA/MF system, e.g., pH and the dosages of ZVI, HA and H_(2)O_(2), were investigated. Unlike the acid-favorable ZVI/H_(2)O_(2) and ZVI/H_(2)O_(2)/HA systems, the MF-assisted system exhibited good performances even at pH up to 6.0 and highest degradation rate at pH of 5.0. ^(·)OH was still identified as the responsible oxidant. A mechanism involving the MF-enhanced heterogeneous-homogeneous iron cycle was proposed in the near-neutral ZVI/H_(2)O_(2)/HA system. Without MF, HA-induced reductive dissolution of the surface iron oxides occurred and thus leaded to homogeneous Fenton reactions. After the introduction of MF, the gradient magnetic field formed on the ZVI particles would induce the generation of concentration cells of Fe(II) and local corrosion of iron. Large amounts of aqueous and bounded Fe(II) catalyzed H_(2)O_(2) to efficiently produce ^(·)OH, while HA maintained the surface and bulk cycles of Fe(II)/Fe(III). The result of study is expected to provide a green, energy-free method in improving the effectiveness of ZVI-based Fenton-like technologies at weak-acidic circumstances.
关 键 词:Fenton like Zero valent iron HYDROXYLAMINE Magnetic field
分 类 号:X703[环境科学与工程—环境工程] O643.36[理学—物理化学]
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