TY - JOUR
T1 - Synergistic effect of ClO4 − and Sr2+ adsorption on alginate-encapsulated organo-montmorillonite beads
T2 - Implication for radionuclide immobilization
AU - Luo, Wuhui
AU - Huang, Qidong
AU - Antwi, Philip
AU - Guo, Binglin
AU - Sasaki, Keiko
N1 - Funding Information:
The authors acknowledge the Natural Science Foundation of Jiangxi Province for Young Scientists (Grant No. 20171BAB216039 and GJJ170536 ), the China Postdoctoral Science Foundation (Grant No. 2018 M640604 ), the Scientific Research Start-up Fund of Jiangxi University of Science and Technology, China (Grant No. 3401223280 ) to WL, and the Japan Society for the Promotion of Science ( JSPS KAKENHI No. 19H00883 ) to KS for the financial support.
Funding Information:
The authors acknowledge the Natural Science Foundation of Jiangxi Province for Young Scientists (Grant No. 20171BAB216039 and GJJ170536), the China Postdoctoral Science Foundation (Grant No. 2018?M640604), the Scientific Research Start-up Fund of Jiangxi University of Science and Technology, China (Grant No. 3401223280) to WL, and the Japan Society for the Promotion of Science (JSPS KAKENHI No. 19H00883) to KS for the financial support.
PY - 2020/2/15
Y1 - 2020/2/15
N2 - Perchlorate (ClO4 −) and pertechnetate (TcO4 −) exhibit similar adsorption characteristics on alkyl quaternary ammonium-modified montmorillonite (Mt), and 99mTcO4 − normally coexists with 90Sr2+ in radionuclide-contaminated water. In this study, hexadecyl pyridinium (HDPy)-modified Mt (OMt) was encapsulated in alginate beads to inhibit HDPy release and simultaneously immobilize ClO4 − and Sr2+ ions. The release of HDPy was remarkably reduced (78 times) from OMt after alginate encapsulation. Adsorption of ClO4 − and Sr2+ on the obtained composite demonstrated synergistic effects, with adsorption capacities reaching 0.542 and 0.484 mmol/g, respectively. Compared to the single-adsorbate system, adsorption capacities of ClO4 − and Sr2+ increased significantly. The characterization of solids using X-ray diffraction, Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, as well as the chemical analysis of the aqueous solution, demonstrated that HDPy+–COO− disintegration accounted for the adsorption synergy. HDPy was extracted from the Mt interlayer space during the synthesis of OMt/alginate and then partially re-intercalated back after interacting with ClO4 − during the adsorption of ClO4 − and/or Sr2+. In the binary-adsorbate system, the synergy-induced adsorption capacity was superior to many previously reported adsorbents, implying that OMt/alginate beads can be a promising adsorbent for the remediation of aqueous solutions contaminated with multiple radionuclides.
AB - Perchlorate (ClO4 −) and pertechnetate (TcO4 −) exhibit similar adsorption characteristics on alkyl quaternary ammonium-modified montmorillonite (Mt), and 99mTcO4 − normally coexists with 90Sr2+ in radionuclide-contaminated water. In this study, hexadecyl pyridinium (HDPy)-modified Mt (OMt) was encapsulated in alginate beads to inhibit HDPy release and simultaneously immobilize ClO4 − and Sr2+ ions. The release of HDPy was remarkably reduced (78 times) from OMt after alginate encapsulation. Adsorption of ClO4 − and Sr2+ on the obtained composite demonstrated synergistic effects, with adsorption capacities reaching 0.542 and 0.484 mmol/g, respectively. Compared to the single-adsorbate system, adsorption capacities of ClO4 − and Sr2+ increased significantly. The characterization of solids using X-ray diffraction, Fourier transform infrared spectroscopy, 13C nuclear magnetic resonance, and X-ray photoelectron spectroscopy, as well as the chemical analysis of the aqueous solution, demonstrated that HDPy+–COO− disintegration accounted for the adsorption synergy. HDPy was extracted from the Mt interlayer space during the synthesis of OMt/alginate and then partially re-intercalated back after interacting with ClO4 − during the adsorption of ClO4 − and/or Sr2+. In the binary-adsorbate system, the synergy-induced adsorption capacity was superior to many previously reported adsorbents, implying that OMt/alginate beads can be a promising adsorbent for the remediation of aqueous solutions contaminated with multiple radionuclides.
UR - http://www.scopus.com/inward/record.url?scp=85073820417&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073820417&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2019.10.049
DO - 10.1016/j.jcis.2019.10.049
M3 - Article
C2 - 31635881
AN - SCOPUS:85073820417
SN - 0021-9797
VL - 560
SP - 338
EP - 348
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -