Competitive adsorption characteristics of fluoride and phosphate on calcined Mg-Al-CO3 layered double hydroxides.

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  • Author(s): Cai P;Cai P; Zheng H; Wang C; Ma H; Hu J; Pu Y; Liang P
  • Source:
    Journal of hazardous materials [J Hazard Mater] 2012 Apr 30; Vol. 213-214, pp. 100-8. Date of Electronic Publication: 2012 Jan 27.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9422688 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-3336 (Electronic) Linking ISSN: 03043894 NLM ISO Abbreviation: J Hazard Mater Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam : Elsevier,
    • Subject Terms:
      Aluminum Hydroxide/*chemistry ; Carbonates/*chemistry ; Fluorides/*chemistry ; Hydroxides/*chemistry ; Magnesium Hydroxide/*chemistry ; Phosphates/*chemistry; Adsorption ; Aluminum Hydroxide/chemical synthesis ; Carbonates/chemical synthesis ; Hydrogen-Ion Concentration ; Hydroxides/chemical synthesis ; Kinetics ; Linear Models ; Magnesium Hydroxide/chemical synthesis ; Mass Spectrometry ; Microscopy, Electron, Scanning ; Models, Theoretical ; Spectroscopy, Fourier Transform Infrared ; X-Ray Diffraction
    • Abstract:
      With synthetic wastewater, competitive adsorption characteristics of fluoride and phosphate on calcined Mg-Al-CO(3) layered double hydroxides (CLDH) were investigated. A series of batch experiments were performed to study the influence of various experimental parameters, such as pH, contact time, and order of addition of the anions on the competitive adsorption of fluoride and phosphate on CLDH. It was found that the optimal pH is around 6 and it took 24 h to attain equilibrium when fluoride and phosphate were simultaneous added. The order of addition of anions influenced the adsorption of fluoride and phosphate on CLDH. The kinetic data were analyzed using the pseudo first-order and pseudo second-order models and they were found to fit very well the pseudo second-order kinetic model. Data of equilibrium experiments were fitted well to Langmuir isotherm and the competitive monolayer adsorption capacities of fluoride and phosphate were found to be obviously lower than those of single anion at 25 °C. The results of X-ray diffraction, Scanning Electron Microscopy with energy-dispersive X-ray analyses, and ATR-FTIR demonstrate that the adsorption mechanism involves the rehydration of mixed metal oxides and concomitant intercalation of fluoride and phosphate ions into the interlayer to reconstruct the initial LDHs structure.
      (Copyright © 2012 Elsevier B.V. All rights reserved.)
    • Accession Number:
      0 (Carbonates)
      0 (Hydroxides)
      0 (Phosphates)
      568Z59H7ZJ (almagate)
      5QB0T2IUN0 (Aluminum Hydroxide)
      NBZ3QY004S (Magnesium Hydroxide)
      Q80VPU408O (Fluorides)
    • Publication Date:
      Date Created: 20120214 Date Completed: 20120723 Latest Revision: 20141120
    • Publication Date:
      20240829
    • Accession Number:
      10.1016/j.jhazmat.2012.01.069
    • Accession Number:
      22326827