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

作     者：Ailing Zhu Yingying Guo Guangliang Liu Maoyong Song Yong Liang Yong Cai Yongguang Yin 

作者机构：Institute of Environment and HealthJianghan UniversityWuhan 430056China State Key Laboratory of Environmental Chemistry and EcotoxicologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Laboratory of Environmental Nanotechnology and Health EffectResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Chemistry and BiochemistryFlorida International UniversityMiamiFL 33199United States 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2019年第30卷第12期

页      面：2241-2244页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

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) 

主　　题：Reduced iron minerals Hydroxyl radical Dark oxidation Mackinawite Dissolved organic matter 

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 ***,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 *** importantly,dissolved organic matter significantly enhances ·OH production,especially under O2 purging,highlighting the importance of this process in ambient *** 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.