title: Spectroscopic characterization and solubility investigation on the effects of As(V) on mineral structure tooeleite (Fe₆(AsO₃)₂SO₄(OH)₂·H₂O).
abstract: Tooeleite is an unique ferric arsenite sulfate mineral, which has the potential significance of directly fixing As(III) as mineral trap. The tooeleite and various precipitates were hydrothermally synthesized under the different of initial As(III)/As(V) molar ratios and characterized by XRD, FTIR, XPS and SEM. The crystallinity of tooeleite decreases with the amount of As(V). The precipitate is free of any crystalline tooeleite at the level of that XRD could detect when the ratio of As(III)/As(V) of 7:3 and more. The characteristic bands of tooeleite are observed in 772, 340, 696 and 304 cm(-1), which are assigned to the ν₁, ν₂, ν₃ and ν₄ vibrations of AsO₃(3-). These intensities of bands gradually decreases with the presence of As(V) and its increasing. An obviously wide band is observed in 830 cm(-1), which is the ν₁ vibration of AsO₄. The result of XPS reveals that the binding energies of As₃d increase from 44.0 eV to 45.5 eV, which indicates that the amount of As(V) in the precipitates increases. The concentrations of arsenic released of these precipitates are 350-650 mg/L. The stability of tooeleite decreases by comparison when the presence of coexisting As(V) ions.
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, 621010 Mianyang, China; The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, 100083 Beijing, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, 621010 Mianyang, China.
authors.forename: Shiming
authors.initials: S
authors.lastname: Deng
authors.affiliation: The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, 100083 Beijing, China.
authors.forename: Fenghua
authors.initials: F
authors.lastname: Zhao
authors.affiliation: The State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, 100083 Beijing, China.
authors.forename: Hongfei
authors.initials: H
authors.lastname: Cheng
authors.affiliation: The Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, 621010 Mianyang, China; School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, 2 George Street, GPO Box 2434, Brisbane, Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D003460:Crystallization; D007501:Iron / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D012995:Solubility; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013431:Sulfates / Q000737:chemistry
chemical_list: D008903:Minerals; D013431:Sulfates; C477679:tooeleite; D007501:Iron; D001151:Arsenic
keywords: Arsenic mineralization; Tooeleite; Vibration spectroscopy