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

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journal contribution
posted on 19.03.2014, 00:00 by Qiuming Peng, Jianxin Guo, Qingrui Zhang, Jianyong Xiang, Baozhong Liu, Aiguo Zhou, Riping Liu, Yongjun Tian
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)xF2–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 μg/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.

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