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Abstract：
Although the removal ability of potassium ferrate (K2FeO4) on aqueous heavy metals has been confirmed by many researchers, little information focuses on the difference between the individual and simultaneous treatment of elements from the same family of the periodic table. In this project, two heavy metals, arsenic (As) and antimony (Sb) were chosen as the target pollutants to investigate the removal ability of K2FeO4 and the influence of humic acid (HA) in simulated water and spiked lake water samples. The results showed that the removal efficiencies of both pollutants gradually increased along the Fe/As or Sb mass ratios. The maximum removal rate of As(III) reached 99.5% at a pH of 5.6 and a Fe/As mass ratio of 4.6 when the initial As(III) concentration was 0.5 mg/L; while the maximum was 99.61% for Sb(III) at a pH of 4.5 and Fe/Sb of 22.6 when the initial Sb(III) concentration was 0.5 mg/L. It was found that HA inhibited the removal of individual As or Sb slightly and the removal efficiency of Sb was significantly higher than that of As with or without the addition of K2FeO4. For the co-existence system of As and Sb, the removal of As was improved sharply after the addition of K2FeO4, higher than Sb; while the latter was slightly better than that of As without K2FeO4, probably due to the stronger complexing ability of HA and Sb. X-ray energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS) were used to characterize the precipitated products to reveal the potential removal mechanisms based on the experimental results.
摘要：
虽然高铁酸钾(K2FeO4)对水中重金属的去除能力已被许多研究者证实,很少有信息集中在元素周期表的同一家族中元素的单独和同时处理之间的差异。在这个项目中,两种重金属,以砷（As）和锑（Sb）为目标污染物，考察了模拟水和加标湖水样品中K2FeO4的去除能力和腐殖酸（HA）的影响。结果表明，随着Fe/As或Sb的质量比，两种污染物的去除效率逐渐增加。当初始As（III）浓度为0.5mg/L时，在pH为5.6，Fe/As质量比为4.6时，As（III）的最大去除率达到99.5％；而当初始Sb（III）浓度为0.5mg/L时，pH为4.5时Sb（III）的最大去除率为99.61％，Fe/Sb为22.6。发现HA对单个As或Sb的去除略有抑制作用，并且Sb的去除效率显着高于添加或不添加K2FeO4的As。对于As和Sb的共存体系，添加K2FeO4后，As的去除率大大提高，高于Sb；而后者比不含K2FeO4的As略好，这可能是由于HA和Sb的络合能力更强。X射线能量色散谱(EDS),X射线衍射仪(XRD),和X射线光电子能谱（XPS）用于表征沉淀产物，以揭示潜在的去除机理基于实验结果。
