In this work, we report a facile and scalable approach to synthesis a porous MXene/single-walled carbon nanotubes (p-MXene/SWCNTs) film as a freestanding electrode for the electrosorption of the organic dyes in wastewater. Dye adsorption of wastewaters is a crucial issue in the water treatment. Nevertheless, there are still several obstacles in the adsorption process hindering its practical application, such as the low efficiency and hard recycle. Electrosorption is an electrochemically accelerate adsorption technique with high removal efficiency, low cost and easy control. As a result, the as-prepared p-MXene/SWCNTs film shows spectacular adsorption capacity for methylene blue (MB) with 1068.8 mg g⁻¹ when the applied voltage is −1.2 V, which is much higher than that of open circuit with 55.8 mg g⁻¹. Notably, the as-prepared electrode exhibits excellent reusability without secondary pollution and the maximum adsorption capacity is up to 28403.7 mg g⁻¹. In addition, it also possesses outstanding selective adsorption for MB and methyl orange (MO) by adjusting the pH values. We anticipate that this strategy of designing p-MXene/SWCNTs film as a freestanding electrode material will be a promising way to remove organic dyes in the wastewaters. Furthermore, we forecast that the as-synthesized p-MXene/SWCNTs film is promising to be acted as flexible electrode applicating in capacitive deionization, supercapacitors, solar cell, catalysts, and biosensors.

在这项工作中，我们报告了一种简便且可扩展的方法来合成多孔MXene /单壁碳纳米管（p-MXene / SWCNTs）膜，作为用于废水中有机染料电吸附的独立式电极。废水中染料的吸附是水处理中的关键问题。然而，在吸附过程中仍然存在一些阻碍其实际应用的障碍，例如低效率和硬回收。电吸附是一种电化学加速吸附技术，具有高去除效率，低成本和易于控制的特点。结果，当施加电压为-1.2 V时，所制备的p-MXene / SWCNTs膜对1068.8 mg g ^-1的亚甲基蓝（MB）表现出惊人的吸附能力，这远高于55.8的开路吸附能力。毫克克^-1。值得注意的是，所制备的电极表现出优异的可重复使用性，而没有二次污染，并且最大吸附容量高达28403.7 mg g ^-1。此外，通过调节pH值，它还具有对MB和甲基橙（MO）的出色选择性吸附。我们预计将p-MXene / SWCNTs膜设计为独立电极材料的这种策略将是一种去除废水中有机染料的有前途的方法。此外，我们预测合成后的p-MXene / SWCNTs膜有望用作柔性电极，应用于电容去离子，超级电容器，太阳能电池，催化剂和生物传感器。