Abstract: Ferrate (Fe(Ⅵ)) has been widely employed due to its oxidant/disinfectant and further utilization of the ensuing Fe(Ⅲ) oxides/hydroxide as coagulants in environmental remediation. Therefore, this review diverse synthesis recipes for Fe(Ⅵ) and their associated physicochemical properties as oxidants, coagulants, and disinfectants for the elimination of a diverse range of chemical and biological species from water/wastewater samples. These introduces involve: (1) Preparation and characteristics of ferrate. (2) The role of pH in the kinetics of the reactions and in determining the removal efficiency of pollutants is highlighted; the rates of competing reactions of Fe(Ⅵ) with itself, water, and the contaminants, which are highly pH dependent, determine the optimum pH ranges of maximum efficacy. (3) Oxidation mechanism of Fe(Ⅵ) through 1-e- and 2-e- transfer processes and further reactions of Fe(Ⅴ) and Fe(Ⅳ) with contaminants; the reduction products Fe(Ⅴ) and Fe(Ⅳ) can continue to react with pollutants through 1-e- and 2-e- electron transfer; cyanide has been studied for the comparative oxidizing capability of ferrates in various oxidation states. The result suggests the rates for the reactivity of ferrates with cyanide to be Fe(Ⅴ)>Fe(Ⅳ)>Fe(Ⅵ). (4) Fe(Ⅵ) can oxidize cell wall, protoplasm, DNA and other vital microorganism organs which kills them immediately. Meanwhile, Fe(Ⅵ) is gradually converted to Fe(Ⅲ) which is a strong coagulant, therefore, colloidal particles including the microorganisms are coagulated and removed from the water. (5) The high reactivity of most EDCs and PPCPs with ferrate(Ⅵ) may be attributed to electron donation by the specific group to the naphthalene moiety. (6) Ames and zebrafish embryos test indicate that Fe(Ⅵ) do not produce mutagenic by products for the study conditions. These results will make it possible to unlock the true potential of ferrates for degrading emerging toxins and pollutants, and in the purified and potable water for humanity in the 21st.
作者简介: 李义豪,2017年3月毕业于东华大学,获得工学硕士学位。现为华南理工大学环境与能源学院博士研究生,在吴平霄教授的指导下进行研究。目前主要研究方向为高铁酸盐在环境修复中的应用。 吴平霄,华南理工大学环境与能源学院教授、博士研究生导师。1990年毕业于南京大学,获得学士学位。 1995年毕业于中国地质大学(武汉),获得硕士学位。1998年毕业于中国科学院广州地球化学研究所,获得博士学位。先后入选教育部“新世纪优秀人才”、第12届“侯德封矿物岩石地球化学青年科学家奖”和广东特支计划百千万工程领军人才。主要从事功能化粘土矿物在环境中应用的研究工作。近年来,在环境材料领域发表论文百余篇,包括Applied Catalysis B: Environmental、Environment International、Journal of Hazardous Materials、Chemical Engineering Journal和Science of the Total Environment等。
引用本文:
李义豪, 吴平霄, 姜璐, 吴沂晓. 高铁酸盐在环境修复中的应用综述[J]. 材料导报, 2020, 34(19): 19003-19009.
LI Yihao, WU Pingxiao, JIANG Lu, WU Yixiao. Progress on Application of Ferrate(Ⅵ) for the Environmental Remediation. Materials Reports, 2020, 34(19): 19003-19009.
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2020, Vol. 34 
