Synthesis of ultrathin, nano-sized Ti3C2Tx with abundant =O and –OH terminals and high transparency as a cocatalyst: Enabling design of high-performance Titania-Ti3C2Tx hybrid photocatalysts
Synthesis of ultrathin, nano-sized Ti3C2Tx with abundant =O and –OH terminals and high transparency as a cocatalyst: Enabling design of high-performance Titania-Ti3C2Tx hybrid photocatalysts
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DOI：
10.1016/j.jpcs.2022.110875
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发表时间：
2022-07
影响因子：
4
通讯作者：
Ahmed Al Mayyahi;Swagotom Sarker;Brian M.Everhart;B. Tonyali;U. Yucel;Placidus B Amama
中科院分区：
文献类型：
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作者：
Ahmed Al Mayyahi;Swagotom Sarker;Brian M.Everhart;B. Tonyali;U. Yucel;Placidus B Amama
传统的Ti 3C 2 Tx用于陶瓷通常具有对工艺有害的特性，例如厚层、低透明度的微尺寸结构和高浓度的氟末端。在此，我们证明了合成的双，纳米尺寸的Ti 3C 2 Tx与丰富的含氧基团（=O和-OH）和高透明度（指定为N-Ti 3C 2 Tx）作为一种替代的助催化剂在液相和气相催化剂。N-Ti 3C 2 Txis通过两步工艺制备，包括通过氟处理从Ti 3AlC 2中蚀刻Al，然后同时剥离和氟还原。N-Ti 3C 2 Tx与TiO 2通过水合和脱水的方法偶联，形成具有不同形貌和表面化学的光催化剂（TiO 2-N-Ti 3C 2 Tx）。N-Ti 3C 2 Tx的小尺寸有利于与TiO 2的强界面接触，从而增强TiO 2和N-Ti 3C 2 Tx之间的电子传输和电子-空穴分离;（2）N-Ti 3C 2 Tx的高透明度有利于光子-TiO 2相互作用。结果表明，TiO 2-N-Ti 3C 2 Tx的光催化活性上级于纯TiO 2、TiO 2与具有低透明性和氟端基的薄的微米级Ti 3C 2 Tx的偶联以及广泛应用的Ti 3C 2 Tx基光催化剂。TiO 2-N-Ti_3C_2 T_x的高光催化活性也归因于N-Ti_3C_2 T_x上丰富的= O和-OH末端的存在促进了污染物的吸附。该研究为TiO 2和Ti 3C 2 Tx的耦合提供了一种合理的方法，以促进有益的电荷转移性能和协同效应，在纳米材料中具有深远的应用。
Conventional Ti3C2Txused in photocatalysis usually has properties that are detrimental to the process such as thick layers, a micro-sized structure with low transparency, and a high concentration of fluorine terminals. Herein, we demonstrate the synthesis of ultrathin, nano-sized Ti3C2Txwith abundant oxygen-containing groups (=O and –OH) and high transparency (designated as N–Ti3C2Tx) as an alternative cocatalyst in liquid and gas phase photocatalysis. N–Ti3C2Txis prepared by a two-step process that involves etching Al from Ti3AlC2via fluorine treatment followed by simultaneous exfoliation and fluorine reduction. N–Ti3C2Txis then coupled with TiO2via hydration and dehydration approaches to form a photocatalyst (TiO2–N–Ti3C2Tx) with distinct morphology and surface chemistry. The small size of N–Ti3C2Txfacilitates a strong interfacial contact with TiO2, thereby enhancing electron transport between TiO2and N–Ti3C2Tx, and electron-hole separation; and (2) the high transparency of N–Ti3C2Txfacilitates photon-TiO2interactions. As a consequence, the photocatalytic activity of TiO2–N–Ti3C2Txis superior to that of pristine TiO2, TiO2coupled with thin, micro-sized Ti3C2Txthat is characterized by low transparency and fluorine terminals, and the widely used Ti3C2Tx-based photocatalyst synthesized by thermal nucleation of TiO2on Ti3C2Tx. The high photocatalytic activity of TiO2–N–Ti3C2Txis also attributed to the presence of abundant = O and –OH terminals on N–Ti3C2Txthat boosts pollutant adsorption. The study provides a rational approach for coupling TiO2and Ti3C2Txto promote beneficial charge transfer properties and synergistic effects that have far-reaching applications in photocatalysis.