过硫酸盐
铁质
X射线光电子能谱
激进的
诺氟沙星
降级(电信)
化学
硫酸盐
羟基自由基
无机化学
热液循环
化学工程
纳米颗粒
降水
氧化还原
核化学
光化学
催化作用
有机化学
计算机科学
工程类
气象学
物理
抗生素
电信
环丙沙星
生物化学
作者
Dahu Ding,Chao Liu,Yuefei Ji,Qian Yang,Lulu Chen,Canlan Jiang,Tianming Cai
标识
DOI:10.1016/j.cej.2016.09.077
摘要
Uniform magnetite nanoparticles (MNP) were prepared through a facile hydrothermal routine and subjected to the heterogeneous activation of persulfate (PS) to degrade norfloxacin (NOR). The degradation efficiency reached 90% within 60 min (the concentration of NOR and PS was 15 μM and 1 mM, respectively; dose of MNP: 0.3 g L−1; pH: 4.0). However, it was greatly inhibited with the increase of pH, especially at basic condition (pH0 = 9.0). This was probably due to the precipitation of the ferrous ions leached from the surface of MNP. In addition, hydroxyl radical was found to dominate the degradation process at acidic condition while both sulfate and hydroxyl radicals contributed to the degradation at neutral condition. Except the leached form, the structural ferrous ion on the surface of MNP also participated in the activation process through the redox reactions, as illustrated by the X-ray photoelectron spectroscopy (XPS) analysis. Finally, four degradation pathways were tentatively proposed based on the identified intermediates and the transformation of piperazinyl ring seemed to be the primary one.
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