Boron removal by hydrotalcite-like, carbonate-free Mg-Al-NO73-LDH and a rationale on the mechanism


AY A. N. , Zuemreoglu-Karan B., TEMEL A.

MICROPOROUS AND MESOPOROUS MATERIALS, vol.98, pp.1-5, 2007 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 98
  • Publication Date: 2007
  • Doi Number: 10.1016/j.micromeso.2006.08.004
  • Journal Name: MICROPOROUS AND MESOPOROUS MATERIALS
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1-5
  • Keywords: hydrotalcite, layered double hydroxide, adsorption, boron, calcination, ION-EXCHANGE, ADSORPTION, WATER, ANION, CLAYS, RESIN

Abstract

Removal of boron from boric acid and tetraborate solutions by hydrotalcite (HT)-like, carbonate-free, Mg-Al-NO3-layered double hydroxide (LDH) was studied. Data from batch experiments were computed as a function of the adsorbent dose and contact time. Synthesis in CO2-free conditions provided a material with high anion exchange capacity and more than 95% adsorption could be achieved. The physical and structural properties of the material before and after boron adsorption were investigated to describe the uptake mechanism. Interpretation of the results of d-spacing, surface area and zeta potential measurements indicated an anion exchange mechanism rather than surface adsorption. Calcination at 400 degrees C did not make any significant change in the removal process. (C) 2006 Elsevier Inc. All rights reserved.