title: Fluoride removal mechanism of bayerite/boehmite nanocomposites: roles of the surface hydroxyl groups and the nitrate anions.
abstract: Three-dimensional feather like bayerite/boehmite nanocomposites were synthesized by a facile one-pot hydrothermal method. The obtained nanocomposites were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption-desorption isotherms. The removal properties toward fluoride were investigated, including adsorption kinetics, adsorption isotherm, and influences of pH and coexisting anions. The maximal adsorption capacity was 56.80 mg g(-1) at pH 7.0, which is favorable compared to those reported in the literature using other adsorbents. The coexisting of sulfate and bicarbonate inhibited the fluoride removal especially at high concentrations. Furthermore, the removal mechanism was revealed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results suggest that both of the surface hydroxyl groups and the nitrate anions were participated in the ion-exchange process.
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China; Department of Pharmacy, Institute of Pharmaceutical Chemistry, Anhui University of Chinese Medicine, Hefei 230031, PR China. Electronic address: yjiaahedu@163.com.
authors.forename: Yong
authors.initials: Y
authors.lastname: Jia
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
authors.forename: Bai-Sheng
authors.initials: BS
authors.lastname: Zhu
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Jin
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
authors.forename: Bai
authors.initials: B
authors.lastname: Sun
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
authors.forename: Tao
authors.initials: T
authors.lastname: Luo
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
authors.forename: Xin-Yao
authors.initials: XY
authors.lastname: Yu
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China. Electronic address: ltkong@iim.cas.cn.
authors.forename: Ling-Tao
authors.initials: LT
authors.lastname: Kong
authors.affiliation: Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, PR China.
authors.forename: Jin-Huai
authors.initials: JH
authors.lastname: Liu
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry*; D000838:Anions; D005459:Fluorides / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites; D009566:Nitrates / Q000737:chemistry*; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D000838:Anions; D009566:Nitrates; D000536:Aluminum Hydroxide; C069471:aluminum oxide hydroxide; D000537:Aluminum Oxide; D005459:Fluorides
keywords: Bayerite/boehmite; Fluoride adsorption; Hydroxyl group; Ion-exchange; Nitrate anions