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Insights into phenanthrene attenuation by hydroxyl radicals from reduced iron-bearing mineral oxygenation

文献类型： 外文期刊

作者： Wang, Longliang 1 ; Du, Haiyan 1 ; Xu, Huacheng 1 ; Li, Huan 3 ; Li, Lina 4 ;

作者机构： 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China

2.Univ Chinese Acad Sci, Beijing, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Leisure Agr, Jiangsu Key Lab Hort Crop Genet Improvement, Nanjing 210014, Peoples R China

4.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201210, Peoples R China

关键词： Hydroxyl radical; Fe-bearing mineral; Fe(II) species; Phenanthrene attenuation

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：14.224； 五年影响因子：12.984 ）

ISSN： 0304-3894

年卷期： 2022 年 439 卷

页码：

收录情况： SCI

摘要： The oxygenation of Fe(II)-bearing minerals for hydroxyl radicals (HO.) formation and contaminant attenuation receive increasing attention, while the mechanisms for specific Fe(II) species in manipulating HO. formation and contaminant attenuation are unclear. Herein, a total of four Fe(III)-bearing minerals were applied in the reduction-oxygenation processes to produce HO.. Results showed that the total HO. generated from the Fe-(oxyhydr)oxides were significantly higher than those from the Fe-silicates, with the order of goethite and hematite (-1500 mu mol kg(-1)) > Fe-montmorillonite (-550 mu mol kg-1) > chlorite (-120 mu mol kg-1). The HO. for-mation was largely hinged on the reactive Fe(II) species, i.e., the surface-adsorbed/low-crystalline Fe(II) in the Fe-bearing minerals. For the co-incubation of minerals and phenanthrene, the concentrations of phenanthrene decreased from the initial 3.0 mg L-1 to 0.7 mg L-1 and 1.9 mg L-1 for Fe-montmorillonite and goethite, respectively, suggesting the HO & BULL; mediated by the Fe-montmorillonite was more conducive for phenanthrene attenuation. The goethite tended to promote the formation of free HO., while the Fe-montmorillonite with interlayer structure can provide attachment sites for the surface-adsorbed/low-crystalline Fe(II), resulting in high potential for surface-bound HO. formation and phenanthrene attenuation. This study highlights the importance of Fe-bearing minerals in manipulating HO' formation, providing new insight into the removal of contaminants in ecosystems.

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