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Removal of aqueous As(III) Sb(III) by potassium ferrate (K2FeO4): The function of oxidation and flocculation.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-07 , DOI: 10.1016/j.scitotenv.2020.138541 Ning Wang 1 , Nannan Wang 1 , Li Tan 1 , Ru Zhang 1 , Qian Zhao 1 , Hongbo Wang 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-04-07 , DOI: 10.1016/j.scitotenv.2020.138541 Ning Wang 1 , Nannan Wang 1 , Li Tan 1 , Ru Zhang 1 , Qian Zhao 1 , Hongbo Wang 1
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This study investigated the effects of potassium ferrate (K2FeO4) dosage, pH, and reaction time on the removal of aqueous As(III) and Sb(III), and revealed the oxidation and flocculation mechanism of K2FeO4. The results show that the removal efficiencies of As(III) and Sb(III) were highly related to the hydrolysate of K2FeO4 under acidic conditions, while the efficiencies were low under alkaline condition, owning to the electrostatic repulsion between iron nanoparticles and charged As/Sb species. The increased dosage and reaction time improved the adsorption performance. Based on the comparative experiments with FeCl3, the simultaneous removal of As(III) and Sb(III) by K2FeO4 suggested that As(III) was eliminated due to the processes of oxidation, flocculation, and chemical precipitation, while Sb(III) was removed mostly by oxidation and flocculation. The generated precipitates were characterized with surface analysis and the results support that the oxidization property of K2FeO4 was essential during the removal of As(III) and Sb(III), and removal mechanisms between both elements were different.
中文翻译：
高铁酸钾（K2FeO4）去除As（III）Sb（III）水溶液：氧化和絮凝的功能。
本研究研究了高铁酸钾（K2FeO4）的用量，pH和反应时间对去除水中As（III）和Sb（III）的影响，并揭示了K2FeO4的氧化和絮凝机理。结果表明，As（III）和Sb（III）的去除效率与酸性条件下K2FeO4的水解产物高度相关，而在碱性条件下效率较低，这归因于铁纳米颗粒与带电的As /之间的静电排斥锑种。增加的剂量和反应时间改善了吸附性能。根据与FeCl3的对比实验，用K2FeO4同时去除As（III）和Sb（III）的结果表明，As（III）由于氧化，絮凝和化学沉淀的过程而被消除，而Sb（III）主要通过氧化和絮凝去除。通过表面分析对生成的沉淀物进行表征，结果表明，在去除As（III）和Sb（III）时，K2FeO4的氧化性能至关重要，并且两种元素之间的去除机理也不同。
更新日期：2020-04-08
中文翻译：
高铁酸钾（K2FeO4）去除As（III）Sb（III）水溶液：氧化和絮凝的功能。
本研究研究了高铁酸钾（K2FeO4）的用量，pH和反应时间对去除水中As（III）和Sb（III）的影响，并揭示了K2FeO4的氧化和絮凝机理。结果表明，As（III）和Sb（III）的去除效率与酸性条件下K2FeO4的水解产物高度相关，而在碱性条件下效率较低，这归因于铁纳米颗粒与带电的As /之间的静电排斥锑种。增加的剂量和反应时间改善了吸附性能。根据与FeCl3的对比实验，用K2FeO4同时去除As（III）和Sb（III）的结果表明，As（III）由于氧化，絮凝和化学沉淀的过程而被消除，而Sb（III）主要通过氧化和絮凝去除。通过表面分析对生成的沉淀物进行表征，结果表明，在去除As（III）和Sb（III）时，K2FeO4的氧化性能至关重要，并且两种元素之间的去除机理也不同。
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