Mechanism and kinetics of aqueous boron removal using MgO

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2 Citations (Scopus)

Abstract

Boron removal is essential for water treatment to ensure the human health and safety. MgO was found to take up B from H3BO3 solutions, due to the electrostatic attractive force of the positively charged MgO with B(OH)4 . B adsorption could be expressed by pseudo-first-order reaction kinetics. The Arrhenius plot of the rate constants yielded an apparent activation energy of 72.0 kJ mol−1 for B adsorption onto MgO, confirming that the uptake of B went through under chemical reaction control. This process was a Langmuir-type adsorption. The value of the maximum adsorption was 21.5 mmol g–1. B desorption from MgO particles containing adsorbed B(OH)4 species was possible using a NaOH solution. The B adsorption ability of the regenerated MgO was lower than that of the original MgO. However, regenerated MgO could still take up B from H3BO3 solution, indicating that MgO can be recycled for B adsorption.

Original languageEnglish
Pages (from-to)237-241
Number of pages5
JournalJournal of Water Process Engineering
Volume26
DOIs
Publication statusPublished - 2018 Dec

Keywords

  • Boron
  • Equilibrium
  • Kinetics
  • MgO
  • Reaction analysis
  • Treatment

ASJC Scopus subject areas

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

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