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

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• 作者：Yunying Wu ; Xiaoli Cheng ; Xianfa Zhang ; Yingming Xu ; ^{xuyingming@hlju.edu.cn} ; Shan Gao ; Hui Zhao ; Lihua Huo ; ^{lhhuo68@yahoo.com}
• 关键词：α-MoO3 ; Porous nanosheets array ; Removal Pb2+ ; PbMoO4
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：491
• 期：Complete
• 页码：80-88
• 全文大小：2578 K
• 卷排序：491

文摘

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 1450.0 mg·g−1, and can effectively reduce Pb2+ concentration from 20 mg·L−1 to a low level of smaller than 3 μg·L−1, well below the acceptable limits in drinking water standards (10 μg·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.