| 水锰矿氧化水溶性硫化物过程及其影响因素 |
| 摘要点击 3086 全文点击 1621 投稿时间：2015-10-05 修订日期：2015-11-16 |
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| 中文关键词 水锰矿 水溶性硫化物 pH 氧化还原 催化 |
| 英文关键词 manganite dissolvable sulfide pH redox catalysis |
| 作者 | 单位 | E-mail | | 罗瑶 | 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070 | luoyao101211@mail.hzau.edu.cn | | 李珊 | 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070 | | | 谭文峰 | 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070 | | | 刘凡 | 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070 | | | 蔡崇法 | 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070 | | | 邱国红 | 华中农业大学资源与环境学院, 农业部长江中下游耕地保育重点实验室, 武汉 430070 | qiugh@mail.hzau.edu.cn |
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| 中文摘要 |
| 作为表生环境中易生成且分布广泛的氧化锰矿物,水锰矿参与水溶性硫化物的氧化反应,影响其迁移、转化和归趋. 本研究考察了水锰矿氧化水溶性硫化物(S2-)的过程与产物,探讨了初始pH、氧气对反应速率与中间产物的影响,X-射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)和透射电镜(TEM)表征水锰矿与水溶性硫化物反应固相产物晶体结构、组分和微观形貌; 分光光度计、高效液相色谱仪和离子色谱仪分析S2-及其氧化物的浓度与变化趋势. 结果表明水锰矿氧化S2-产物主要为单质S,起始pH降低可加速S2-的初始氧化反应,对产物组成并无显著影响; 有氧环境中单质S会进一步氧化生成S2O32-,且水锰矿表现出良好的催化作用与化学稳定性,反应约10 h,晶体结构保持稳定. |
| 英文摘要 |
| As one of the manganese oxides, which are easily generated and widely distributed in supergene environment, manganite participates in the oxidation of dissolvable sulfide (S2-), and affects the migration, transformation, and the fate of sulfides. In the present work, the redox mechanism was studied by determining the intermediates, and the influence of initial pH and oxygen atmosphere on the processes were studied. The chemical composition, crystal structures and micromorphologies were characterized by XRD, FTIR and TEM. The concentration of S2- and its oxidation products were analyzed using spectrophotometer, high performance liquid chromatograph and ion chromatograph. The results indicated that elemental sulfur was formed as the major oxidation product of S2- oxidation, and decreased pH could accelerate the oxidation rate of S2- in the initial stage, however, there was no significant influence on final products. Elemental S could be further oxidized to S2O32- when the reaction system was bubbled with oxygen, and manganite exhibited excellent catalytic performance and chemical stability during the oxidation of dissolvable sulfide by oxygen. After reaction of more than 10 h, the crystal structure of manganite remained stable. |
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