Mechanism of Goethite Precipitation on Magnetite and Maghemite Nanoparticles Studied by Surface Complexation/Precipitation Modeling

Yue, Tong1,2; Sun, Wei1; Hu, Yuehua1; Xu, Zhenghe2,3

2018-12-18

10.1021/acs.langmuir.8b02571

LANGMUIR   影响因子和分区

0743-7463

Precipitation of goethite on magnetic nanoparticles (MNPs) has been proposed as an effective means to separate goethite from calcium sulfate in the iron removal process of zinc hydrometallurgy, which allows reuse of the hazardous residues. This study focuses on investigating the underlying mechanisms of goethite precipitation on magnetite and maghemite MNPs, providing insights on Fe(III)(aq) adsorption and nucleation of goethite on MNPs. A predictive surface complexation/precipitation model of the system was developed based on the results from two different types of experiments: the potentiometric titration of MNPs to calculate proton binding constants (K-a) of discrete MNP surface functional groups and the corresponding site concentrations; and adsorption of Fe(III)(aq) onto MNP surfaces to determine metal binding constants (K-f). The composition of the surface complexes on MNPs was by time-of-flight secondary ion mass spectrometry. The results indicated the formation of polynuclear surface complexes. content of polynuclear surface complexes was found to be significantly higher on maghemite MNPs than on magnetite MNPs. This trend is consistent with our experimental results of a greater goethite precipitation on maghemite than on magnetite. Overall, the formation of Fe(III) polynuclear surface complexes correlates directly to the nucleation and precipitation of goethite on the surfaces of both types of MNPs.

SCI ; EI

英语

通讯

National 111 Project, Collaborative Innovation Center for Clean and Efficient utilization of Strategic Metal Mineral Resources[B14034]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary

WOS:000454183500003

AMER CHEMICAL SOC

20185106280739

Calcium compounds ; Magnetite ; Magnetite nanoparticles ; Nanomagnetics ; Nucleation ; Precipitation (chemical) ; Secondary ion mass spectrometry ; Sulfur compounds ; Titration ; Voltammetry

Magnetism: Basic Concepts and Phenomena:701.2 ; Magnetic Materials:708.4 ; Chemistry:801 ; Electrochemistry:801.4.1 ; Chemical Operations:802.3 ; Crystal Growth:933.1.2

CHEMISTRY

Web of Science

1.Cent S Univ, Sch Minerals Proc & Bioengn, Room 310,Shengwu Bldg,984 Lushannan Rd, Changsha 410083, Hunan, Peoples R China
2.Univ Alberta, Dept Chem & Mat Engn, Donadeo Innovat Ctr Engn, 12-354 Donadeo Innovation Ctr Engn,9211-116 St, Edmonton, AB T6G 1H9, Canada
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Yue, Tong,Sun, Wei,Hu, Yuehua,et al. Mechanism of Goethite Precipitation on Magnetite and Maghemite Nanoparticles Studied by Surface Complexation/Precipitation Modeling[J]. LANGMUIR,2018,34(50):15134-15142.

Yue, Tong,Sun, Wei,Hu, Yuehua,&Xu, Zhenghe.(2018).Mechanism of Goethite Precipitation on Magnetite and Maghemite Nanoparticles Studied by Surface Complexation/Precipitation Modeling.LANGMUIR,34(50),15134-15142.

Yue, Tong,et al."Mechanism of Goethite Precipitation on Magnetite and Maghemite Nanoparticles Studied by Surface Complexation/Precipitation Modeling".LANGMUIR 34.50(2018):15134-15142.