Unique Lead Adsorption Behavior of Activated Hydroxyl Group in Two-Dimensional Titanium Carbide

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• 作者：Qiuming Peng ; Jianxin Guo ; Qingrui Zhang ; Jianyong Xiang ; Baozhong Liu ; Aiguo Zhou ; Riping Liu ; Yongjun Tian
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：March 19, 2014
• 年：2014
• 卷：136
• 期：11
• 页码：4113-4116
• 全文大小：275K
• 年卷期：v.136,no.11(March 19, 2014)
• ISSN：1520-5126

文摘

The functional groups and site interactions on the surfaces of two-dimensional (2D) layered titanium carbide can be tailored to attain some extraordinary physical properties. Herein a 2D alk-MXene (Ti₃C₂(OH/ONa)_xF_2鈥?i>x) material, prepared by chemical exfoliation followed by alkalization intercalation, exhibits preferential Pb(II) sorption behavior when competing cations (Ca(II)/Mg(II)) coexisted at high levels. Kinetic tests show that the sorption equilibrium is achieved in as short a time as 120 s. Attractively, the alk-MXene presents efficient Pb(II) uptake performance with the applied sorption capacities of 4500 kg water per alk-MXene, and the effluent Pb(II) contents are below the drinking water standard recommended by the World Health Organization (10 渭g/L). Experimental and computational studies suggest that the sorption behavior is related to the hydroxyl groups in activated Ti sites, where Pb(II) ion exchange is facilitated by the formation of a hexagonal potential trap.