TY - JOUR
T1 - Removal of arsenite from aqueous solution by a zirconia nanoparticle
AU - Zheng, Yu Ming
AU - Yu, Ling
AU - Wu, Dan
AU - Paul Chen, J.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/4/15
Y1 - 2012/4/15
N2 - This study evaluated the effectiveness of a readily prepared zirconia nanoparticle in removing arsenite (As(III)) from aqueous solution. It was demonstrated, without pre-oxidation of arsenite, the sorbent was highly effective for As(III) removal with a maximum adsorption capacity of 1.85. mmol-As/g. The sorbent had a high adsorption capacity toward As(III) at pH 5-10, and the optimal pH was around 8. The kinetics studies showed that most of the arsenite uptake occurred rapidly in the first 10. h, and the adsorption equilibrium was obtained within 48. h. The pseudo-second order model described the kinetics data well, and intraparticle diffusion model implied that two rate-limiting steps were involved in the sorption process. The adsorption isotherm data were well described by the Langmuir model. The adsorption was independent on ionic strength, implying As(III) may form inner-sphere complexes on the sorbent. The presence of humic acid or typical anions (e.g., fluoride, silicate, phosphate, and sulfate) did not greatly pose negative effects on the As(III) adsorption. However, the uptake of As(III) was hindered by the existence of bicarbonate. FTIR and XPS spectroscopic analyses suggested that hydroxyl and sulfate groups were involved in the As(III) uptake. Finally, an adsorption mechanism was proposed for better understanding on the adsorption of As(III).
AB - This study evaluated the effectiveness of a readily prepared zirconia nanoparticle in removing arsenite (As(III)) from aqueous solution. It was demonstrated, without pre-oxidation of arsenite, the sorbent was highly effective for As(III) removal with a maximum adsorption capacity of 1.85. mmol-As/g. The sorbent had a high adsorption capacity toward As(III) at pH 5-10, and the optimal pH was around 8. The kinetics studies showed that most of the arsenite uptake occurred rapidly in the first 10. h, and the adsorption equilibrium was obtained within 48. h. The pseudo-second order model described the kinetics data well, and intraparticle diffusion model implied that two rate-limiting steps were involved in the sorption process. The adsorption isotherm data were well described by the Langmuir model. The adsorption was independent on ionic strength, implying As(III) may form inner-sphere complexes on the sorbent. The presence of humic acid or typical anions (e.g., fluoride, silicate, phosphate, and sulfate) did not greatly pose negative effects on the As(III) adsorption. However, the uptake of As(III) was hindered by the existence of bicarbonate. FTIR and XPS spectroscopic analyses suggested that hydroxyl and sulfate groups were involved in the As(III) uptake. Finally, an adsorption mechanism was proposed for better understanding on the adsorption of As(III).
KW - Adsorption
KW - Arsenite
KW - Isotherm
KW - Kinetics
KW - Mechanism
KW - Nanoparticle
UR - http://www.scopus.com/inward/record.url?scp=84862804227&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2011.12.054
DO - 10.1016/j.cej.2011.12.054
M3 - 文章
AN - SCOPUS:84862804227
VL - 188
SP - 15
EP - 22
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -