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Hydroxyl radical formation upon dark oxidation of reduced iron minerals: Effects of iron species and environmental factors

查看全文 作　　者：Ailing [1,2]Zhu;Yingying [2,3]Guo;Guangliang [1,4]Liu;Maoyong [2,3]Song;Yong [1]Liang;Yong [2,3,4]Cai;Yongguang [1,2,3]Yin 高影响力作者 机构地区：[1]Institute of Environment and Health,Jianghan University,Wuhan 430056,China;[2]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;[3]Laboratory of Environmental Nanotechnology and Health Effect,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;[4]Department of Chemistry and Biochemistry,Florida International University,Miami,FL 33199,United States高影响力机构 出　　处：《Chinese Chemical Letters》索引2019年第30卷第12期,共4页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (No.21777178);Key Projects for Frontier Sciences of the Chinese Academy of Sciences (No.QYZDBSSWDQC018);the CAS Interdisciplinary Innovation Team (No. JCTD-2018-04);supports from the National Young Top-Notch Talents (No.W03070030);Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2016037) 摘　　要：Dark formation of hydroxyl radical upon oxidation of reduced iron minerals plays an important role in the degradation and transformation of organic and inorganic pollutants.Herein,we compared the hydroxyl radical formation from various reduced iron minerals at different redox conditions.·OH production was generally observed from the oxidation of reduced iron minerals,following the order:mackinawite(FeS)>reduced nontronite(iron-bearing smectite clay)> pyrite(FeS2)> side rite(FeCO3).Structural Fe^2+ and dissolved O2 play critical roles in ·OH production from reduced iron minerals.·OH production increases with decreasing pH,and Cl^-has little effect on this process.More importantly,dissolved organic matter significantly enhances ·OH production,especially under O2 purging,highlighting the importance of this process in ambient environments.This sunlight-independent pathway in which ’OH forms during oxidation of reduced iron minerals is helpful for understanding the degradation and transformation of various inorganic and organic pollutants in the redox-fluctuation environments. 关 键 词：Reduced iron minerals Hydroxyl radical Dark oxidation MACKINAWITE Dissolved organic matter
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