School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China.
Resources and Environment Innovation Institute, Shandong Jianzhu University, Jinan 250101, China.
Int J Environ Res Public Health. 2023 Feb 28;20(5):4317. doi: 10.3390/ijerph20054317.
Although the removal ability of potassium ferrate (KFeO) 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 KFeO 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 KFeO. For the co-existence system of As and Sb, the removal of As was improved sharply after the addition of KFeO, higher than Sb; while the latter was slightly better than that of As without KFeO, 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.
尽管高铁酸钾 (KFeO) 去除水溶液中重金属的能力已被许多研究人员所证实，但关于同一周期表元素家族中元素的单独和同时处理之间的差异的信息却很少。在本项目中，选择两种重金属砷（As）和锑（Sb）作为目标污染物，研究 KFeO 的去除能力以及腐殖酸（HA）在模拟水样和富营养化湖水样品中的影响。结果表明，随着 Fe/As 或 Sb 质量比的增加，两种污染物的去除效率逐渐提高。当初始 As(III)浓度为 0.5mg/L 时，在 pH 值为 5.6 和 Fe/As 质量比为 4.6 的条件下，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，在 pH 值为 4.5 和 Fe/Sb 质量比为 22.6 的条件下，Sb(III)的最大去除率达到 99.61%。结果发现，HA 略微抑制了单独 As 或 Sb 的去除，且在添加 KFeO 时 Sb 的去除效率明显高于 As。对于 As 和 Sb 的共存体系，添加 KFeO 后 As 的去除率显著提高，高于 Sb；而后者在没有 KFeO 的情况下略优于 As，这可能是由于 HA 和 Sb 的络合能力更强。利用 X 射线能谱仪（EDS）、X 射线衍射仪（XRD）和 X 射线光电子能谱仪（XPS）对沉淀产物进行了表征，根据实验结果揭示了潜在的去除机制。
