| 张慧,余文婷,罗明标,徐志良,吴昊.化学通报,2020,83(2):167-171. |
| 环境中有机物和微生物对黄铁矿还原铀的影响 |
| Effects of Microbes and Organics in the Environment on the Reduction of U(Ⅵ) by Pyrite |
| 投稿时间：2019-10-29 修订日期：2019-11-30 |
| DOI： |
| 中文关键词: 黄铁矿 还原 铀 腐殖酸 氧化亚铁硫杆菌 |
| 英文关键词:Pyrite Reduction Uranium Humic acid Thiobacillus ferrooxidans |
| 基金项目:国家自然科学基金项目（21761001）、国防基础科研项目（JCKY2017401C005）、江西省教育厅科学技术研究项目（GJJ170478）和研究生创新项目（DHYC-201912）资助 |
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| 中文摘要: |
| 天然铀矿中铀常与黄铁矿共生，这两者之间存在着相互作用，而环境中有机物和微生物也会对此共生现象产生一些影响。本文采用循环伏安法（CV）研究了黄铁矿与U（VI）体系中的铀价态的变化及电子转移数，结果表明，黄铁矿可以自发把U（VI）还原到U（V）和U（IV）。腐殖酸（HA）存在时对黄铁矿还原铀有抑制作用，氧化亚铁硫杆菌（TF）存在时则有协同作用。光电子能谱研究表明，黄铁矿中的Fe2+和S-对U（VI）的还原都起了作用。本文从电子、离子等微观角度研究了黄铁矿还原富集铀的反应机理，解释了天然铀矿中铀与黄铁矿共生这一现象，为铀成矿理论提供了新依据，并为黄铁矿在环境污染修复中的应用及周围环境影响程度的大小提供了理论依据。 |
| 英文摘要: |
| Uranium is often symbiotic with pyrite in natural uranium ore, and there is an interaction between uranium and pyrite. Organics and microbes in the environment may also have some influence on this symbiosis. In this paper, cyclic voltammetry (CV) was used to study the change of uranium valence state and electron transfer number in pyrite and U(VI) system. The results showed that pyrite could spontaneously reduce U(VI) to U(V) and U(IV). It was also found that humic acid (HA) inhibited the reduction of uranium by pyrite, while thiobacillus ferrooxidans (TF) could promote the reduction process. Photoelectron spectroscopy studies showed that Fe2+ and S- in pyrite both play a role in the reduction of U(VI). The mechanism of reduction and enrichment of uranium in pyrite is studied from the microscopic perspectives of electron and ion, and the symbiosis of uranium and pyrite in natural uranium ore is explained, which provides a new basis for the theory of uranium mineralization. It provides a new theoretical basis for the application of pyrite in environmental pollution restoration and the degree of influence of the surrounding environment. |
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