TY - JOUR
T1 - Contribution of boron-specific resins containing N-methylglucamine groups to immobilization of borate/boric acid in a permeable reactive barrier comprising agglomerated MgO
AU - Sasaki, Keiko
AU - Qiu, Xinhong
AU - Miyawaki, Jin
AU - Ideta, Keiko
AU - Takamori, Hitoshi
AU - Moriyama, Sayo
AU - Hirajima, Tsuyoshi
N1 - Funding Information:
Financial support was provided to KS by Funding Program for Next Generation of World-Leading Researchers (“NEXT program” GR078 ) in Japan Society for Promotion of Science (JSPS). This study was partially supported by the New Energy and Industrial Technology Development Organization (NEDO) under the Innovative Zero-emission Coal-fired Power Generation Project. The authors thank to Dr. Qianqian Yu at Japan Atomic Energy Agency for Rietveld refinement, Dr. Yudzuru Inoue at Kyushu University for analytical techniques, and Ms. Makiko Semba for graphic design.
PY - 2014/3/17
Y1 - 2014/3/17
N2 - Permeable reactive barrier (PRB) column tests for removal of borate were carried out over 287days corresponding to 76 pore volumes (pv), using MgO agglomerates as the primary reactive material, with and without boron-specific resin (CRB05). Adding 3 (% v/v) CRB05 increased the column shelf life (the time until effluent contains the maximum boron concentration for drinking water) by about 50%, and increased boron accumulation within the column by 15% over 76pv. The quantities of boron captured were 15-17mg/g-CRB05, and 1-2mg-B/g-MgO, decreasing with increasing distance along the column. Rietveld refinement of X-ray diffraction patterns from solid residues after 76pv revealed that 69-78% of the MgO was transformed into Mg(OH)2 independent of distance along the column, implying that hydration of MgO is not always associated with integration of borate. 11B-NMR spectra demonstrated that trigonal B ([3]B) is predominantly immobilized in Mg(OH)2 in both columns, while tetragonal B ([4]B) is largely trapped in the added CRB05. The complexed forms of [4]B with the N-methylglucamine group after 76pv were mostly bischelate, with some monodentate. CRB05 contributed to immobilization of [4]B (which is difficult to react with MgO), however, the resin surface was gradually covered with Mg(OH)2 and inactivated.
AB - Permeable reactive barrier (PRB) column tests for removal of borate were carried out over 287days corresponding to 76 pore volumes (pv), using MgO agglomerates as the primary reactive material, with and without boron-specific resin (CRB05). Adding 3 (% v/v) CRB05 increased the column shelf life (the time until effluent contains the maximum boron concentration for drinking water) by about 50%, and increased boron accumulation within the column by 15% over 76pv. The quantities of boron captured were 15-17mg/g-CRB05, and 1-2mg-B/g-MgO, decreasing with increasing distance along the column. Rietveld refinement of X-ray diffraction patterns from solid residues after 76pv revealed that 69-78% of the MgO was transformed into Mg(OH)2 independent of distance along the column, implying that hydration of MgO is not always associated with integration of borate. 11B-NMR spectra demonstrated that trigonal B ([3]B) is predominantly immobilized in Mg(OH)2 in both columns, while tetragonal B ([4]B) is largely trapped in the added CRB05. The complexed forms of [4]B with the N-methylglucamine group after 76pv were mostly bischelate, with some monodentate. CRB05 contributed to immobilization of [4]B (which is difficult to react with MgO), however, the resin surface was gradually covered with Mg(OH)2 and inactivated.
UR - http://www.scopus.com/inward/record.url?scp=84893814107&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84893814107&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2013.11.018
DO - 10.1016/j.desal.2013.11.018
M3 - Article
AN - SCOPUS:84893814107
SN - 0011-9164
VL - 337
SP - 109
EP - 116
JO - Desalination
JF - Desalination
IS - 1
ER -