TY - JOUR
T1 - Highly Efficient Antimonate Removal from Water by Pyrite/Hematite Bi-Mineral
T2 - Performance and Mechanism Studies
AU - He, Xingyu
AU - Min, Xiaobo
AU - Peng, Tianyu
AU - Ke, Yong
AU - Zhao, Feiping
AU - Wang, Yunyan
AU - Sillanpää, Mika
N1 - Publisher Copyright:
Copyright © 2019 American Chemical Society.
PY - 2019/12/12
Y1 - 2019/12/12
N2 - Pyrite/hematite bi-mineral (FeS2/α-Fe2O3) was obtained by thermal modification of pyrite. FeS2/α-Fe2O3 was investigated and developed as a promising adsorbent for antimonate [Sb(V)] removal. The influence of initial concentration, temperature, initial pH, contact time, and coexisting anions on Sb(V) adsorption performance of FeS2/α-Fe2O3 was investigated. FeS2/α-Fe2O3 exhibited good adsorption performance and excellent removal efficiency. The results of the Langmuir isotherm model indicated that FeS2/α-Fe2O3 had a large adsorption capacity (347.2 mg/g) for Sb(V) removal from water. High removal efficiency by FeS2/α-Fe2O3 was achieved over a broad pH range (2.5-10.7). The coexisting anions had little influence on Sb(V) adsorption by FeS2/α-Fe2O3. The pseudo-second-order and Dubinin-Radushkevich model analyses (E = 12.62 kJ/mol) suggested that FeS2/α-Fe2O3's Sb(V) removal process was chemisorption. The negative Gibbs free energy change and endothermic enthalpy change of 5.00 kJ/mol indicated that Sb(V) adsorption by FeS2/α-Fe2O3 was feasible, endothermic, and spontaneous. Additionally, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses indicated that Sb(V) formed an inner-sphere complex on thiol groups and hydroxyl groups surface sites on the surface of FeS2/α-Fe2O3. At last, the real environmental water application also confirmed the excellent adsorption performance of FeS2/α-Fe2O3. From a practical viewpoint, FeS2/α-Fe2O3 can be a hopeful alternative for the remediation of Sb(V) pollution because of its large uptake capacity, low-cost, reusability, and easy availability.
AB - Pyrite/hematite bi-mineral (FeS2/α-Fe2O3) was obtained by thermal modification of pyrite. FeS2/α-Fe2O3 was investigated and developed as a promising adsorbent for antimonate [Sb(V)] removal. The influence of initial concentration, temperature, initial pH, contact time, and coexisting anions on Sb(V) adsorption performance of FeS2/α-Fe2O3 was investigated. FeS2/α-Fe2O3 exhibited good adsorption performance and excellent removal efficiency. The results of the Langmuir isotherm model indicated that FeS2/α-Fe2O3 had a large adsorption capacity (347.2 mg/g) for Sb(V) removal from water. High removal efficiency by FeS2/α-Fe2O3 was achieved over a broad pH range (2.5-10.7). The coexisting anions had little influence on Sb(V) adsorption by FeS2/α-Fe2O3. The pseudo-second-order and Dubinin-Radushkevich model analyses (E = 12.62 kJ/mol) suggested that FeS2/α-Fe2O3's Sb(V) removal process was chemisorption. The negative Gibbs free energy change and endothermic enthalpy change of 5.00 kJ/mol indicated that Sb(V) adsorption by FeS2/α-Fe2O3 was feasible, endothermic, and spontaneous. Additionally, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses indicated that Sb(V) formed an inner-sphere complex on thiol groups and hydroxyl groups surface sites on the surface of FeS2/α-Fe2O3. At last, the real environmental water application also confirmed the excellent adsorption performance of FeS2/α-Fe2O3. From a practical viewpoint, FeS2/α-Fe2O3 can be a hopeful alternative for the remediation of Sb(V) pollution because of its large uptake capacity, low-cost, reusability, and easy availability.
UR - http://www.scopus.com/inward/record.url?scp=85074990082&partnerID=8YFLogxK
U2 - 10.1021/acs.jced.9b00801
DO - 10.1021/acs.jced.9b00801
M3 - Article
AN - SCOPUS:85074990082
SN - 0021-9568
VL - 64
SP - 5910
EP - 5919
JO - Journal of Chemical & Engineering Data
JF - Journal of Chemical & Engineering Data
IS - 12
ER -