Tianjin Key Lab of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, No. 92 Weijin Road, Nankai District, Tianjin 300072, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, No. 38 Tongyan Road, Jinnan District, Tianjin 300350, China.
Sci Total Environ. 2021 Mar 25;762:143076. doi: 10.1016/j.scitotenv.2020.143076. Epub 2020 Oct 16.
Vivianite (Fe(PO)·8HO) is a common hydrous ferrous phosphate mineral which often occurs in reductive conditions, especially anoxic non-sulfide environment containing high concentrations of ferrous iron (Fe) and orthophosphate (PO). Vivianite is an important product of dissimilatory iron reduction and a promising route for phosphorus recovery from wastewater. Its formation is closely related to the extracellular electron transfer (EET), a key mechanism for microbial respiration and a crucial explanation for the reduction of metal oxides in soil and sediments. Despite of the natural ubiquity, easy accessibility and attractive economic value, the application value of vivianite has not received much attention. This review introduces the characteristics, occurrence and biosynthesis of vivianite from microbial EET, and systematically analyzes the application value of vivianite in the environmental field, including immobilization of heavy metals (HMs), dechlorination of carbon tetrachloride (CT), sedimentary phosphorus sequestration and eutrophication alleviation. Additionally, its potential functions as a slow-release fertilizer are discussed as well. In general, vivianite is expected to make more contributions to the future scientific research, especially the solution of environmental problems. Overcoming the lack of understanding and some technical limitations will be beneficial to the further application of vivianite in environmental field.
蓝铁矿（Fe(PO)·8HO）是一种常见的水合亚铁磷酸盐矿物，通常在还原条件下形成，特别是在缺氧非硫化环境中，含有高浓度的亚铁离子（Fe）和正磷酸盐（PO）。蓝铁矿是异化铁还原的重要产物，也是从废水中回收磷的有前途的途径。其形成与细胞外电子转移（EET）密切相关，EET 是微生物呼吸的关键机制，也是土壤和沉积物中金属氧化物还原的关键解释。尽管蓝铁矿在自然界中广泛存在，易于获取，且具有诱人的经济价值，但它的应用价值尚未得到太多关注。本文介绍了蓝铁矿从微生物 EET 中形成的特征、存在和生物合成，并系统分析了蓝铁矿在环境领域的应用价值，包括重金属（HMs）的固定、四氯化碳（CT）的脱氯、沉积物磷的固定和富营养化缓解。此外，还讨论了其作为缓释肥料的潜在功能。总的来说，蓝铁矿有望为未来的科学研究做出更多贡献，特别是解决环境问题。克服缺乏了解和一些技术限制将有利于蓝铁矿在环境领域的进一步应用。
