In this work, we studied the formation of the rutile phase of titanium dioxide (TiO 2 ) on delaminated MXene ( d -Ti 3 C 2 T x ) flakes by the reaction of Ti 3 C 2 T x with amino acids in water. Three types of amino acids with varied side-chain polarity were used to delaminate Ti 3 C 2 T x . d -Ti 3 C 2 T x flakes formed stable colloidal solutions due to the negative surface charges of chemisorbed amino acids on the d -Ti 3 C 2 T x . Rutile formed on d -Ti 3 C 2 T x at room temperature upon the intercalation of aromatic amino acids and subsequent sonication of the solution, while flakes intercalated with aliphatic amino acids did not oxidize. To analyze the delamination process and the formation of rutile on d -Ti 3 C 2 T x -MXene, X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy were used. As-synthesized histidine functionalized rutile TiO 2 @ d -Ti 3 C 2 T x hybrid was used for adsorption of Cu 2+ ions from aqueous solution with the maximum uptake of 95 mg g -1 .

中文翻译：

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Ti3C2Tx MXene的表面同时发生分层和金红石形成，以吸附铜。

在这项工作中，我们研究了通过Ti 3 C 2 T x与氨基酸在水中的反应，在分层的MXene（d -Ti 3 C 2 T x）薄片上形成二氧化钛（TiO 2）的金红石相。使用三种具有不同侧链极性的氨基酸对Ti 3 C 2 T x进行分层。d-Ti 3 C 2 T x薄片由于d -Ti 3 C 2 T x上化学吸附氨基酸的负表面电荷而形成稳定的胶体溶液。在室温下，在插入芳族氨基酸并随后对该溶液进行超声处理后，在d -Ti 3 C 2 T x上形成金红石型，而在插入脂族氨基酸的薄片中则不会氧化。为了分析d -Ti 3 C 2 T x -MXene的分层过程和金红石的形成，X射线衍射，拉曼光谱，扫描电子显微镜，透射电子显微镜与能量色散X射线光谱法和X射线光电子光谱法结合使用。合成的组氨酸官能化金红石型TiO 2 @ d -Ti 3 C 2 T x杂化物用于从水溶液中吸附Cu 2+离子，最大吸收量为95 mg g -1。