Hybrid porous magnetic bentonite-chitosan beads for selective removal of radioactive cesium in water
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Hybrid porous magnetic bentonite-chitosan beads for selective removal of radioactive cesium in water. / Wang, Kexin; Ma, Hui; Pu, Shengyan; Yan, Chun; Wang, Miaoting; Yu, Jing; Wang, Xiaoke; Chu, Wei; Zinchenko, Anatoly.
In: Journal of Hazardous Materials, Vol. 362, 15.01.2019, p. 160-169.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Hybrid porous magnetic bentonite-chitosan beads for selective removal of radioactive cesium in water
AU - Wang, Kexin
AU - Ma, Hui
AU - Pu, Shengyan
AU - Yan, Chun
AU - Wang, Miaoting
AU - Yu, Jing
AU - Wang, Xiaoke
AU - Chu, Wei
AU - Zinchenko, Anatoly
PY - 2019/1/15
Y1 - 2019/1/15
N2 - Easy-to-obtain magnetic bentonite-chitosan hybrid beads (Bn-CTS) were prepared by immobilizing bentonite within a porous structure of chitosan beads to achieve a hybrid adsorption effect for the removal of cesium ion (Cs+) from water. The hybrid adsorbent, which had a porous structure and abundant binding sites contributed by both chitosan and bentonite, ensured superb adsorption characteristics. The paramagnetic character of the beads enabled their facile separation for recycling. The chitosan/bentonite ratio, pH and contact time were optimized to achieve the optimal Cs+ efficiency, and the adsorption kinetics and isotherms were thoroughly discussed. The adsorption kinetics obeyed the pseudo-second-order model, and the best fitted equation for equilibrium data was the Langmuir isotherm model. The maximum adsorption capacity of the bentonite-chitosan beads was 57.1 mg g−1. The adsorbent had excellent selectivity towards Cs+ adsorption in the presence of abundant cations (Li+, Na+, K+ and Mg2+). The adsorbent was able to be recycled by treating the beads with 0.1 mol L−1 of MgCl2 to quantitatively desorb Cs+ from the beads. Overall, the magnetic bentonite-chitosan beads can be used as a highly efficient adsorbent for radioactive waste disposal and management.
AB - Easy-to-obtain magnetic bentonite-chitosan hybrid beads (Bn-CTS) were prepared by immobilizing bentonite within a porous structure of chitosan beads to achieve a hybrid adsorption effect for the removal of cesium ion (Cs+) from water. The hybrid adsorbent, which had a porous structure and abundant binding sites contributed by both chitosan and bentonite, ensured superb adsorption characteristics. The paramagnetic character of the beads enabled their facile separation for recycling. The chitosan/bentonite ratio, pH and contact time were optimized to achieve the optimal Cs+ efficiency, and the adsorption kinetics and isotherms were thoroughly discussed. The adsorption kinetics obeyed the pseudo-second-order model, and the best fitted equation for equilibrium data was the Langmuir isotherm model. The maximum adsorption capacity of the bentonite-chitosan beads was 57.1 mg g−1. The adsorbent had excellent selectivity towards Cs+ adsorption in the presence of abundant cations (Li+, Na+, K+ and Mg2+). The adsorbent was able to be recycled by treating the beads with 0.1 mol L−1 of MgCl2 to quantitatively desorb Cs+ from the beads. Overall, the magnetic bentonite-chitosan beads can be used as a highly efficient adsorbent for radioactive waste disposal and management.
KW - Bentonite
KW - Cesium
KW - Hydrogel beads
KW - Magnetic adsorbent
KW - Radioactive wastewater
UR - http://www.scopus.com/inward/record.url?scp=85053371696&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2018.08.067
DO - 10.1016/j.jhazmat.2018.08.067
M3 - Journal article
C2 - 30236936
AN - SCOPUS:85053371696
VL - 362
SP - 160
EP - 169
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
ER -
ID: 213624377