Interaction mechanisms and kinetics of ferrous ion and hexagonal birnessite in aqueous systems
作者： Tianyu Gao , Yougang Shen , Zhaoheng Jia , Guohong Qiu , Fan Liu
DOI: 10.1186/S12932-015-0031-3
关键词: Birnessite 、 Mineralogy 、 Inorganic chemistry 、 Ferrous 、 Chemistry 、 Redox 、 Goethite 、 Lepidocrocite 、 Aqueous solution 、 Manganese 、 Ferric
摘要: In soils and sediments, manganese oxides oxygen usually participate in the oxidation of ferrous ions. There is limited information concerning interaction process mechanisms ions oxides. The influence air (oxygen) on reaction kinetics has been seldom studied. Because redox reactions occur open systems, participation needs to be further investigated. To simulate this process, hexagonal birnessite was prepared used oxidize anoxic aerobic aqueous systems. pH, concentration, temperature, presence rate accompanied by release Mn2+ K+ ions, a significant decrease Fe2+ formation mixed lepidocrocite goethite during initial stage. Lepidocrocite did not completely transform into under condition with pH about 5.5 within 30 days. exhibited much higher catalytic activity than transformation from amorphous Fe(III)-hydroxide conditions. rates were compared estimate different Redox found controlled chemical reaction, increased increasing temperature. ferric (hydr)oxides precipitate inhibited reduction birnessite. accelerated facilitated stability birnessite, which reduced dissolved after 18 days. As for air, low high pHs lepidocrocite, respectively. experimental results illustrated single combined effects oxide
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