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Abstract:
A novel oxidized hollow carbon sphere (OHCS) as absorbent for the removal of Pb2+ was fabricated from the mixture of coal-tar pitch and aluminum isopropoxide followed by nitric acid oxidation. The as-prepared OHCSs were characterized by FESEM, TEM, BET, TG, FTIR and XPS, and meanwhile the effects of adsorption conditions on the Pb2+ removal were investigated by batch experiments. Results show that the OHCSs prepared possess discrete cage-like structures and well-defined inner/outer surface features, exhibiting vertically aligned graphene-like nanosheets on their surfaces with mesoporous nature and high hydrophobicity. The maximum absorption capacity for Pb2+ of the OHCSs can reach 280.79 mg g−1 at the optimum condition. The adsorption kinetic of Pb2+ onto the OHCSs was found to be well modeled by pseudo-second-order kinetic model, and the experimental equilibrium data were represented well by Langmuir isotherm model. Moreover, the OHCSs still exhibit excellent adsorption ability and stability after recycling 5 times, indicating its excellent reusability performance. Overall, the OHCS is a promising adsorbent for Pb2+ removal. © 2019 Elsevier Inc.
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Journal of Colloid and Interface Science
ISSN: 0021-9797
Year: 2019
Volume: 553
Page: 484-493
7 . 4 8 9
JCR@2019
9 . 4 0 0
JCR@2023
ESI HC Threshold:184
JCR Journal Grade:1
CAS Journal Grade:3
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 1
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