水环境中锰的迁移转化机理及其研究进展  

Research progress on migration and transformation mechanism of manganese in water environment

作　　者：薛莉娉[1] 唐玉朝 李圭白[2] 黄显怀[1] 梁恒[2] 伍昌年[1] 唐小斌 朱长银[3] XUE Liping;TANG Yuchao;LI Guibai-;HUANG Xianhuai;LIANG Heng;WU Changnian;TANG Xiaobin;ZHU Changyin(Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse,Anhui Jianzhu University,Hefei 230601,China;State Key Laboratory of Urban Water Resources and Environment,Harbiri Institute of Technology,Harbin 150001,China;He fei Water Supply Group Co.,Ltd.,Hefei 230011,China)

机构地区：[1]安徽建筑大学,环境污染控制与废弃物资源化利用安徽省重点实验室,合肥230601 [2]哈尔滨工业大学,城市水资源与水环境国家重点实验室,哈尔滨150001 [3]合肥供水集团有限公司,合肥230011

出　　处：《给水排水》2022年第4期21-28,34,共9页Water & Wastewater Engineering

基　　金：安徽教育厅自然科学研究重点项目(KJ2019ZD54)和一般项目(KJ2019D10)

摘　　要：锰的生物地球化学循环主要是在溶解性的Mn(Ⅱ)与不溶性的Mn(Ⅲ,Ⅳ)氧化物或氢氧化物之间的转换,一定条件下Mn(Ⅲ)及其配合物在循环过程中也扮演了重要角色.锰在水环境中的迁移与转化过程主要受氧化还原控制,pH对锰的迁移转化也有重要影响.水体呈还原状态时,锰在水中主要为Mn(Ⅱ)价态,存在形态根据pH不同主要以溶解态的Mn^(2+)[六水合Mn(H_(2)O)_(6)^(2+)]和MnHCO^(3+)等离子形态分布于水体及沉积物中,Mn(Ⅱ)亦可与有机和无机配体形成溶解性配合物.水中溶解的Mn^(3+)可以在Mn(Ⅳ)的还原或Mn(Ⅱ)的氧化过程中作为中间产物产生,但Mn^(3+)离子不稳定,容易歧化为Mn^(2+)和MnO_(2).水体中稳定存在的Mn(Ⅲ)一般以非溶解态的含Mn(Ⅲ)的矿物形式或以溶解态的配合物Mn(Ⅲ)-L形态存在.颗粒锰(Ⅲ,Ⅳ)氧化物(MnO_(x),x≈1.8~2)是水环境中最强的氧化剂之一,可以将水环境中的有机质氧化分解.高价锰氧化物和Mn(Ⅲ)在水质处理过程可作为氧化剂,氧化分解有机物等还原性物质.锰的氧化还原过程可能是通过化学过程或微生物代谢参与过程来实现的,并且锰的氧化还原与沉淀溶解对天然水环境与水质化学特性有极为重要的影响.The biogeochemical cycle of manganese is mainly the conversion between dissolved Mn(Ⅱ)and insoluble Mn(Ⅲ,Ⅳ)oxides or hydroxides.Under certain conditions,Mn(Ⅲ)and its complexes play an important role in the biogeochemical cycle of manganese.The migration and transformation process of manganese in the aqueous environment is not only determined by the redox process but also influenced by pH value.In the reduction state,manganese in the water environment is mainly in the valence state of Mn(Ⅱ).Depending on the pH,manganese is primarily distributed in the water environment and sediments as dissolved Mn^(2+)(i.e.,hydrated Mn(H_(2)O)_(6)^(2+))and MnHCO^(3+).In addition,Mn(Ⅱ)can also form soluble complexes with organic and inorganic ligands.Dissolved Mn^(3+)can be generated as an intermediate product in the process of Mn(Ⅳ)reduction or Mn(Ⅱ)oxidation.However,Mn^(3+) ions are unstable and easy to be disproportionate into Mn^(2+)and MnO_(2).Mn(Ⅲ)that can exist stably in water generally exists in the form of non-dissolved Mn(EH)containing ore or in the form of dissolved complex Mn(Ⅲ)-L.Within the water environment,particulate manganese oxide(MnO_(x),x≈1.8-2)is one of the strongest oxidants and can decompose organic matter in the water.High valence manganese oxide and Mn(Ⅲ)can be used as oxidants to achieve water purification effect in water treatment process.The redox process of manganese can be a chemical process or a microbial metabolism involved process.The redox and precipitation-dissolution of manganese have a significant impact on the water environment and the chemical characteristics of natural water.

关 键 词：锰 Mn(Ⅱ) Mn(Ⅲ) MnO_(2) 迁移转化 

分 类 号：X52[环境科学与工程—环境工程] X171.5