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• W3208982710 endingPage "133358" @default.
• W3208982710 startingPage "133358" @default.
• W3208982710 abstract "• KMnO 4 can oxidize Fe(II) to form crystalline two-line ferrihydrite (δ-Keggin). • MnO 2 acts as an ion channel to allow internal Fe(II) further oxidation and hydrolysis. • Low concentration of KMnO 4 substantially enhances the adsorption ability of siderite. • Fe(OH) 2 as the mesocrystal exists in the process of mineral transformation. • The Mn(II) in the siderite lattice cannot be oxidized by H 2 O 2 . Fe(III)-(hydr)oxides can be formed by the oxidation-hydrolysis of Fe(II) minerals, its initial state is usually amorphous, which can form dense flocs quickly with a high specific surface area, resulting in widely used in the field of water treatment. However, the rate and path of oxidation-hydrolysis lead to the difference in the crystal structure of the precursor, which are directly determined by the crystallinity and adsorption activity of the final oxidized hydrolysate. Therefore, this study investigated the phase transition of siderite under different oxidation-hydrolysis paths. The results suggested KMnO 4 could first oxidize the surface layer Fe(II) of siderite; and then Mn(II), hidden in the crystal lattice of siderite, was continuously exposed to the surface of siderite; after that, Mn(II) was oxidized by KMnO 4 to form MnO 2 , which acts as an ion channel to allow internal Fe(II) of siderite further hydrolysis to form crystalline Fe(OH) 2 and then further oxidation to form crystalline two-line ferrihydrite (δ-Keggin). Although Fe(OH) 2 as transient precursor will disappear with the continuation of oxidation, its presence will greatly reduce the nucleation barrier of two-line ferrihydrite. These mineral phase transitions resulted in the low concentration of KMnO 4 (0.03 mmol/L) could substantially enhance the ability of siderite to remove phosphate, with the maximum adsorption capacity (13.04 mg/g, Langmuir). However, H 2 O 2 could only oxidize Fe(II) on the surface of siderite to form amorphous Fe(OH) 3 , while Mn(II) in the siderite lattice could not be oxidized. The surface coverage of amorphous Fe(OH) 3 and exposed Mn(II) formed a dense passive film, resulting in the termination of the oxidation and showed a low adsorption activity (3.28 mg/g)." @default.
• W3208982710 created "2021-11-08" @default.
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• W3208982710 date "2022-03-01" @default.
• W3208982710 modified "2023-09-26" @default.
• W3208982710 title "The influence of crystal structure and formation path of precursor on phosphate adsorption during oxidation-hydrolysis phase transition of siderite" @default.
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• W3208982710 doi "https://doi.org/10.1016/j.cej.2021.133358" @default.
• W3208982710 hasPublicationYear "2022" @default.
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