Unique Lead Adsorption Behavior of Activated Hydroxyl Group in Two-Dimensional Titanium Carbide
Unique Lead Adsorption Behavior of Activated Hydroxyl Group in Two-Dimensional Titanium Carbide
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二维碳化钛中活化羟基的独特铅吸附行为
DOI：
10.1021/ja500506k
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发表时间：
2014-03-19
影响因子：
15
通讯作者：
Tian, Yongjun
中科院分区：
文献类型：
--
作者：
Peng, Qiuming;Guo, Jianxin;Tian, Yongjun
二维（20）层状碳化钛表面的官能团和位点相互作用可以定制，以获得一些非凡的物理性能。通过化学剥离和碱化插层法制备的20 alk-MXene (Ti3C2（OH/ONa)(x)F-2_x）材料，在高水平竞争阳离子(Ca-(II)/Mg(II))共存时，表现出对Pb（II）的优先吸附行为。动力学试验表明，吸附平衡在120s内即可达到。引人注目的是，alk-MXene具有高效的Pb（II）吸收性能，每个alk-MXene可吸附4500 kg水，出水Pb（II）含量低于世界卫生组织推荐的饮用水标准（10 μ g/L）。实验和计算研究表明，吸附行为与活性Ti位点的羟基有关，其中Pb（II）离子交换通过形成六边形电位陷阱而促进。
The functional groups and site interactions on the surfaces of two-dimensional (20) layered titanium carbide can be tailored to attain some extraordinary physical properties. Herein a 20 alk-MXene (Ti3C2(OH/ONa)(x)F-2_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 mu 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.