岩石矿物学杂志2011，Vol.30Issue(6)：1007-1013,7.
水钠锰矿氧化硫化物的过程与动力学研究
An investigation of the oxidation process and kinetics of sulfides by birnessite
摘要
Abstract
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. The influence of temperature, pH value of solution and the amount of added birnessite on the oxidation rate of S was studied. 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. Oxidation rate increases with elevating reaction temperature, decreasing pH value of solution and the increase of the amount of added minerals. During the redox process, birnessite is reduced to Mn(0H)2, which can be oxidized into Mn3O4 by O2 in air, and M13O4 is further transformed into MnOOH.关键词
水钠锰矿/硫化物/氧化还原/动力学/土壤化学Key words
birnessite/ sulfide/ redox/ kinetics/ soil chemistry分类
天文与地球科学引用本文复制引用
李倩,俞颖,刘凡,冯雄汉,谭文峰,邱国红..水钠锰矿氧化硫化物的过程与动力学研究[J].岩石矿物学杂志,2011,30(6):1007-1013,7.基金项目
教育部博士点基金新教师项目(20070504053) （20070504053）
国家自然科学基金(41171375,20807019,40830527) （41171375,20807019,40830527）
