High efficient and selective removal of Pb2+ through formation of lead molybdate on α-MoO3 porous nanosheets array

Yunying Wu; Xiaoli Cheng; Xianfa Zhang; Yingming Xu; Shan Gao; Hui Zhao; Lihua Huo

doi:10.1016/j.jcis.2016.12.029

High efficient and selective removal of Pb²⁺ through formation of lead molybdate on α-MoO₃ porous nanosheets array

J Colloid Interface Sci. 2017 Apr 1:491:80-88. doi: 10.1016/j.jcis.2016.12.029. Epub 2016 Dec 18.

Authors

Yunying Wu¹, Xiaoli Cheng¹, Xianfa Zhang¹, Yingming Xu², Shan Gao¹, Hui Zhao¹, Lihua Huo³

Affiliations

¹ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
² Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China. Electronic address: xuyingming@hlju.edu.cn.
³ Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China. Electronic address: lhhuo68@yahoo.com.

PMID: 28012916
DOI: 10.1016/j.jcis.2016.12.029

Abstract

2D hand-like structured α-MoO₃ porous nanosheets were grown in-situ onto a capillary by a simple hydrothermal route, on which titanium dioxide seed layer was sol-dip-coated in advance. The α-MoO₃ porous nanosheets array exhibits an exceptional lead ion uptake capacity up to 1450.0mg·g^-1, and can effectively reduce Pb²⁺ concentration from 20mg·L^-1 to a low level of smaller than 3μg·L^-1, well below the acceptable limits in drinking water standards (10μg·L^-1) and can efficiently remove 99.9% lead ion within a few minutes at room temperature. Furthermore, α-MoO₃ porous nanosheets array also has high selectivity toward Pb²⁺ better than Cu²⁺, Zn²⁺, Cr³⁺ and Cd²⁺. The mechanism for adsorption was discussed according to the results of Zeta potential, IR, XPS and XRD analyses. The excellent removal performance of the array to Pb²⁺ is resulted from the electrostatic adsorption interaction and the formation of new species lead molybdate.

Keywords: PbMoO(4); Porous nanosheets array; Removal Pb(2+); α-MoO(3).