Solvothermal synthesis of the defect pyrochlore KNbWO6·H2O and its application in Pb2+ removal

Yong Nam Han; Shihui Jiao; Man Xu; Guangsheng Pang; Shouhua Feng

doi:10.1039/C3RA47190J

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Solvothermal synthesis of the defect pyrochlore KNbWO₆·H₂O and its application in Pb²⁺ removal†

Yong Nam Han,‡^a Shihui Jiao,^a Man Xu,^a Guangsheng Pang*^a and Shouhua Feng^a

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* Corresponding authors

^a State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
E-mail: panggs@jlu.edu.cn

Abstract

The octahedral defect pyrochlore KNbWO₆·H₂O is prepared by a two-step solvothermal process. It shows an excellent performance in the removal of toxic Pb²⁺ by ion exchange. The removal process fits well with the Langmuir isotherm, and the maximum removal capacity is 86.95 mg g⁻¹ at pH 5.0. High selectivity to Pb²⁺ is observed in an aqueous solution also containing Mn²⁺, Cd²⁺ and Co²⁺. The kinetics of the ion exchange process can be expressed by the pseudo-second-order rate kinetic model.

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Article information

DOI: https://doi.org/10.1039/C3RA47190J
Article type: Paper
Submitted: 02 Dec 2013
Accepted: 31 Jan 2014
First published: 03 Feb 2014

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RSC Adv., 2014,4, 14357-14360

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Solvothermal synthesis of the defect pyrochlore KNbWO₆·H₂O and its application in Pb²⁺ removal

Y. N. Han, S. Jiao, M. Xu, G. Pang and S. Feng, RSC Adv., 2014, 4, 14357 DOI: 10.1039/C3RA47190J

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