Bioinspired functionalization of MXenes (Ti3C2Tx) with amino acids for efficient removal of heavy metal ions
Bioinspired functionalization of MXenes (Ti3C2Tx) with amino acids for efficient removal of heavy metal ions
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DOI：
10.1016/j.apsusc.2019.144603
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发表时间：
2020-02-28
影响因子：
6.7
通讯作者：
Wei, Yen
中科院分区：
文献类型：
--
作者：
Gan, Defu;Huang, Qiang;Wei, Yen
MXenes是一种新型的二维（2D）材料，可以通过刻蚀层状六方三元碳化物中的Al原子来获得。这些2D材料显示出许多优异的物理化学性质，并有可能用于各种应用。虽然以前的报道表明，MXenes和MXenes基复合材料可以潜在地用于环境应用，但吸附性能是有限的，并且开发用于合成具有更高吸附能力的MXenes基复合材料的简便方法是非常重要的。在这项工作中，我们首次报道了MXenes基聚合物复合材料（Ti 3C 2 Tx-PDOPA）可以通过在相当温和的反应条件下混合MXenes（Ti 3C 2 Tx）和左旋多巴（DOPA）来简单地制备。在该反应体系中，DOPA可以通过自聚合的方式附着在MXene表面，并在聚合过程中引入大量的羧基形成聚DOPA。将所得Ti 3C 2 Tx-PDOPA复合材料用作吸附剂，并显示出比原始Ti 3C 2 Tx更高的去除重金属离子的吸附容量。更重要的是，Ti 3C 2 Tx-PDOPA复合材料可以通过后续反应与其他功能材料进一步功能化，因为许多反应性官能团被引入到MXenes上，并且可以制备各种MXenes基复合材料。
MXenes are a novel type of two-dimensional (2D) materials that could be obtained from etching of Al atoms in layered hexagonal ternary carbide. These 2D materials display many outstanding physicochemical properties and are potentially utilized for various applications. Although previous reports demonstrated that MXenes and MXenes-based composites could be potentially utilized for environmental applications, the adsorption performance is limited and development of facile methods for synthesis MXenes-based composites with higher adsorption capability is of great importance. In this work, we reported for the first time that MXenes-based polymeric composites (Ti3C2Tx-PDOPA) could be simply fabricated via mixing of MXenes (Ti3C2Tx) and levodopa (DOPA) under rather mild reaction conditions. In this reaction system, DOPA could adhere on the surface of MXenes through self-polymerization and many carboxyl groups could thus introduce during the polymerization procedure to form poly (DOPA). The resultant Ti3C2Tx-PDOPA composites were utilized as adsorbents and showed higher adsorption capacity in removal heavy metal ions as compared with that of raw Ti3C2Tx. More importantly, Ti3C2Tx-PDOPA composites could be further functionalized with other functional materials through subsequent reaction because many reactive functional groups were introduced on MXenes and various MXenes-based composites could be fabricated.