An Investigation of the Oxidation Process and Kinetics of Sulfides by Birnessite

详细信息   

• 责任者：Li Qian (College of Resources and Environment ; Huazhong Agricultural University ; Wuhan 430070 ; China) ; Yu Ying
• 刊名：Acta Petrologica et Mineralogica
• 出版年：2011
• 卷期：30(6)
• 关键词：水钠锰矿 ; birnessite ; Eh ; Eh
• 页码：p.1007-1013
• 图表：7 illus., 16 refs.
• 分类号：0600
• 出版序号：20122271
• issnNo：ISSN1000-6524
• isbnNo：CN11-1966/P

摘要

As one of the common manganese oxide minerals in the supergene environment, birnessite affects the migration, transformation and environmental fate of sulfur in soil. In this study, the oxidation process of sodium sulfide by birnessite was investigated. The kinds and concentrations of oxidation products of sulfides in solution were determined by spectrophotometry and ion chromatography, and the crystal structures and micro-morphologies of solid oxidation products of sulfides were analyzed by XRD and SEM. It is observed that the main oxidation product of sulfides is elementary substance S, and the S₂-oxidation rate follows a pseudo-first-order reaction.