TY - JOUR
T1 - Nanostructured chitosan/molecular sieve-4A an emergent material for the synergistic adsorption of radioactive major pollutants cesium and strontium
AU - Goyal, Nitin
AU - Gao, Peng
AU - Wang, Zhe
AU - Cheng, Shuwen
AU - Ok, Yong Sik
AU - Li, Gang
AU - Liu, Liying
N1 - Funding Information:
This research study was supported by National Natural Science Foundation of China (Grants 51406029 ), Project of Xingliao talents ( XLYC1807119 ), and Fundamental Research Funds for the central Universities (Grants N172504027 & N182508027 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/6/15
Y1 - 2020/6/15
N2 - A fresh adsorbent nanostructured chitosan/molecular sieve 4A hybrid (NSC@MS-4A) was fabricated for the rapid adsorption of strontium (Sr2+) and cesium (Cs+) ions from aqueous solutions. The as-obtained NSC@MS-4A were thoroughly characterized by XRD, FE-SEM, EDS, BET, XPS and FT-IR. The physio-chemical properties and structural aspects revealed that NSC@MS-4A acquires fine surface area (72 m2/g), porous structure as well as compatible functional groups (–P–O–P and –C–O–C) for the admission of Cs+ and Sr2+ ions. The batch adsorption studies concluded that prepared adsorbent displayed a maximum adsorption of 92–94 % within 40 min. Fast adsorption of Cs+ and Sr2+ was achieved at neutral pH (6–7), ambient temperature (25−30 °C) and slow agitation speed (50−60 rpm) which could propose vast benefits such as little power utilization and uncomplicated operation. Among six types of adsorption isotherms, Freundlich isotherm showed the best fit with R2>0.997. Pseudo-second order made a better agreement as compare to other kinetic models. The thermodynamic coefficients suggested the passage of Cs+ and Sr2+ ions through the liquid solid boundary is exothermic and spontaneous. The NSC@MS-4A displayed excellent regenerability properties over five repetitive adsorption/desorption cycles, which specified that as-obtained NSC@MS-4A is a sustainable as well as efficient adsorbent for practical decontamination of radioactive liquid waste.
AB - A fresh adsorbent nanostructured chitosan/molecular sieve 4A hybrid (NSC@MS-4A) was fabricated for the rapid adsorption of strontium (Sr2+) and cesium (Cs+) ions from aqueous solutions. The as-obtained NSC@MS-4A were thoroughly characterized by XRD, FE-SEM, EDS, BET, XPS and FT-IR. The physio-chemical properties and structural aspects revealed that NSC@MS-4A acquires fine surface area (72 m2/g), porous structure as well as compatible functional groups (–P–O–P and –C–O–C) for the admission of Cs+ and Sr2+ ions. The batch adsorption studies concluded that prepared adsorbent displayed a maximum adsorption of 92–94 % within 40 min. Fast adsorption of Cs+ and Sr2+ was achieved at neutral pH (6–7), ambient temperature (25−30 °C) and slow agitation speed (50−60 rpm) which could propose vast benefits such as little power utilization and uncomplicated operation. Among six types of adsorption isotherms, Freundlich isotherm showed the best fit with R2>0.997. Pseudo-second order made a better agreement as compare to other kinetic models. The thermodynamic coefficients suggested the passage of Cs+ and Sr2+ ions through the liquid solid boundary is exothermic and spontaneous. The NSC@MS-4A displayed excellent regenerability properties over five repetitive adsorption/desorption cycles, which specified that as-obtained NSC@MS-4A is a sustainable as well as efficient adsorbent for practical decontamination of radioactive liquid waste.
KW - Adsorption
KW - Adsorption mechanism
KW - Cesium
KW - Molecular sieve 4A
KW - Nanochitosan
KW - Strontium
UR - http://www.scopus.com/inward/record.url?scp=85081690314&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.122494
DO - 10.1016/j.jhazmat.2020.122494
M3 - Article
C2 - 32193120
AN - SCOPUS:85081690314
SN - 0304-3894
VL - 392
JO - Journal of hazardous materials
JF - Journal of hazardous materials
M1 - 122494
ER -