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The influence of crystal structure and formation path of precursor on phosphate adsorption during oxidation-hydrolysis phase transition of siderite
Xing, Bobo; Zhao, Binghao; Liu, Mengjie; Graham, Nigel J. D.; Yu, Wenzheng
2022-03-01
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume431Issue:0Pages:133358
AbstractFe(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 KMnO4 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 KMnO4 to form MnO2, 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 (delta-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 KMnO4 (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, H2O2 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).
Department中国科学院饮用水科学与技术重点实验室 ; 中国科学院饮用水科学与技术重点实验室
KeywordNATURAL ORGANIC-MATTER PHOSPHORUS REMOVAL WASTE-WATER ULTRAFILTRATION MEMBRANE HUMIC-ACID IRON TRANSFORMATION PERFORMANCE GOETHITE CALCIUM
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47908
Collection中国科学院饮用水科学与技术重点实验室
Corresponding AuthorYu, Wenzheng
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
2.Imperial Coll London, Dept Civil & Environm Engn, South Kensington Campus, London SW7 2AZ, England
Recommended Citation
GB/T 7714
Xing, Bobo,Zhao, Binghao,Liu, Mengjie,et al. The influence of crystal structure and formation path of precursor on phosphate adsorption during oxidation-hydrolysis phase transition of siderite[J]. CHEMICAL ENGINEERING JOURNAL,2022,431(0):133358.
APA Xing, Bobo,Zhao, Binghao,Liu, Mengjie,Graham, Nigel J. D.,&Yu, Wenzheng.(2022).The influence of crystal structure and formation path of precursor on phosphate adsorption during oxidation-hydrolysis phase transition of siderite.CHEMICAL ENGINEERING JOURNAL,431(0),133358.
MLA Xing, Bobo,et al."The influence of crystal structure and formation path of precursor on phosphate adsorption during oxidation-hydrolysis phase transition of siderite".CHEMICAL ENGINEERING JOURNAL 431.0(2022):133358.
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