Among current approaches for removing boron, chemical precipitation is widely used for treating wastewater that contain a high boron concentration. The need for heating and very large amounts of coagulant limits the efficiency of this method. Accordingly, this work developed a chemical oxo-preceipitation (COP) method, which uses hydrogen peroxide (H2O2) as the oxidant and barium hydroxide (Ba(OH)2) as the precipitant to improve considerably the chemical precipitation of wastewater with a high concentration of boron at room temperature. Under suitable conditions (pHi 9, mole ratio of H2O2/B = 2, and mole ratio of Ba/B = 0.8), boron can be efficiently removed from solution by forming amorphous precipitates of barium perborate. After four hours, amorphous barium perborate was transformed to a particular species with a crystalline phase. Consequently, the boron concentration was reduced from 1000 mg/L to 2 mg/L in six hours. The results of XRD, Raman spectroscopy and ICP prove that a dinuclear perborate with double peroxo bridges constituted the crystalline precipitate whose chemical formula was found to be BaB2(O2)2 (OH)4-n (OOH)n.
|Number of pages||4|
|Publication status||Published - 2014|
|Event||6th International Conference on Applied Energy, ICAE 2014 - Taipei, Taiwan|
Duration: 2014 May 30 → 2014 Jun 2
All Science Journal Classification (ASJC) codes