水钠锰矿界面铁矿物形成对Sb迁移转化的影响

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摘要本文系统地研究了水钠锰矿(MnO₂)界面铁矿物的形成对锑(Sb)环境行为的影响.在得到的Fe-Mn二元氧化物(Fe-MnO₂)上发现了许多颗粒物和丰富的孔结构. HRTEM和XRD分析表明,锚定在MnO₂上的颗粒物为水铁矿.在MnO₂中形成的铁矿物增强了对Sb(III)和Sb(V)的吸附性能. Fe-MnO₂对Sb(III)和Sb(V)的吸附量分别为397.4,247.7mg/g,远高于MnO₂对Sb(III)和Sb(V)的固定化吸附量(342.0,71.8mg/g).化学键络合是Sb(III)和Sb(V)固定化的主要机制.静电吸附在Sb(V)的固定化中起着重要作用.水铁矿显著降低了Sb的迁移率. MnO₂在Sb(III)向Sb(V)的转化中发挥了关键的氧化作用.本研究不仅揭示了Fe-Mn二元氧化物的形成机制,而且有助于进一步认识Sb在环境中的迁移和转化行为.

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	李婉霞
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	刘奕安
	吴平霄

关键词 ：水钠锰矿, 铁矿物形成, 锑, 迁移, 转化

Abstract：The effects of the formation of iron minerals at the interface of birnessite (MnO₂) on the environmental behavior of antimony (Sb) were systematically studied in this paper. Many nanoparticles and abundant pore structure was found on the obtained Fe-Mn binary oxide (Fe-MnO₂). HRTEM and XRD analysis indicated that the nanoparticles anchored on MnO₂ was ferrihydrite. The iron minerals formed on MnO₂ enhanced adsorption performance for Sb(III) and Sb(V). The adsorption capacities of Sb(III) and Sb(V) by Fe-MnO₂ were 397.4 and 247.7mg/g, respectively, which was much higher than that of MnO₂ for Sb(III) and Sb(V) immobilization (342.0 and 71.8mg/g). The chemical bond complexation was the dominant mechanism for Sb(III) and Sb(V) immobilization. The electrostatic adsorption played an important role in Sb(V) immobilization. The ferrihydrite made a significant contribution for reducing the mobility of Sb. MnO₂ played the critical role in the transformation of Sb(III) to Sb(V). This study not only reveals the formation mechanism of Fe-Mn binary oxide, but also helps to further understand the migration and transformation behavior of Sb in the environment.

Key words： birnessite iron minerals formation antimony migration transformation

收稿日期: 2024-08-28

PACS:

X53

基金资助:国家自然科学基金资助项目(42207254)

作者简介: 李婉霞(2001-),女,广东阳江人,广东工业大学硕士研究生,主要从事矿物界面反应与环境修复功能材料研究.发表论文1篇.liwanxia123@outlook.com.

引用本文:

李婉霞, 陈梅青, 刘奕安, 吴平霄. 水钠锰矿界面铁矿物形成对Sb迁移转化的影响[J]. 中国环境科学, 2025, 45(3): 1341-1350. LI Wan-xia, CHEN Mei-qing, LIU Yi-an, WU Ping-xiao. The influence of the formation of iron minerals at the interface of birnessite on the migration and transformation of Sb. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1341-1350.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2025/V45/I3/1341

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