水钠锰矿界面铁矿物形成对Sb迁移转化的影响  

The influence of the formation of iron minerals at the interface of birnessite on the migration and transformation of Sb

作　　者：李婉霞 陈梅青 刘奕安 吴平霄 LI Wan-xia;CHEN Mei-qing;LIU Yi-an;WU Ping-xiao(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China;School of Environment and Energy,South China University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学环境科学与工程学院,广东广州510006 [2]华南理工大学环境与能源学院,广东广州510006

出　　处：《中国环境科学》2025年第3期1341-1350,共10页China Environmental Science

基　　金：国家自然科学基金资助项目(42207254)。

摘　　要：本文系统地研究了水钠锰矿(MnO_(2))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-MnO_(2))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Mn O_(2)上的颗粒物为水铁矿.在MnO_(2)中形成的铁矿物增强了对Sb(Ⅲ)和Sb(V)的吸附性能.Fe-MnO_(2)对Sb(Ⅲ)和Sb(V)的吸附量分别为397.4,247.7mg/g,远高于MnO_(2)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.Mn O_(2)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.The effects of the formation of iron minerals at the interface of birnessite(MnO_(2))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-MnO_(2)).HRTEM and XRD analysis indicated that the nanoparticles anchored on MnO_(2)was ferrihydrite.The iron minerals formed on MnO_(2)enhanced adsorption performance for Sb(Ⅲ)and Sb(V).The adsorption capacities of Sb(Ⅲ)and Sb(V)by Fe-MnO_(2)were 397.4 and 247.7mg/g,respectively,which was much higher than that of MnO_(2)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.MnO_(2)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.

关 键 词：水钠锰矿 铁矿物形成 锑 迁移 转化 

分 类 号：X53[环境科学与工程—环境工程]