Solubility products of sparingly soluble barium perborates in aqueous solution that contains B(OH)3 and H2O2 at 25 °C

Jui Yen Lin, Yi Jin Song, Yu Jen Shih, Yao Hui Huang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Chemical oxo-precipitation (COP) has become a promising method for treating boron wastewater at room temperature; it uses hydrogen peroxide to convert boric acid to perborate species, which are precipitated using alkaline earth metals. In this work, solubility models of barium perborates were established to predict residual boron levels from COP. The solubility product constants (pKsp) of two major barium perborates – amorphous Ba(B(OH)3OOH)2 (A-BaPB) and crystalline BaB(OH)2(OO)2B(OH)2 (C-BaPB) – were experimentally estimated (8.335 ± 0.109 and 9.190 ± 0.057, respectively) to define the solubility curves of BaPBs at given pH, ionic strength and concentrations of barium and peroxide species. The characterization of precipitates that were formed by COP confirmed that the boron levels in aqueous solution were governed by the phase transformation of A-BaPB to C-BaPB. The predictive solubility models of barium perborates can perfectly predict the residual concentration of boron after COP treatment and can be used to optimize the process for reducing boron concentrations in wastewater.

Original languageEnglish
Pages (from-to)703-710
Number of pages8
JournalJournal of Colloid And Interface Science
Volume505
DOIs
Publication statusPublished - 2017 Nov 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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