Insight into Adsorption Performance and Mechanism on Efficient Removal of Methylene Blue by Accordion-like V2CTx MXene.

Dye-bearing wastewaters leading to the water pollution and ecological upset is a crucial issue in the textile industry. Herein, we report a facile method using two-dimensional transition metal carbides (MXenes) for the removal of the methylene blue (MB) in the water. The accordion-like V2CTx MXene is originally demonstrated to have high and spontaneous adsorption capacity of MB at 111.11 mg·g-1, thrice over that of Ti3C2Tx as previously reported. The wide lamellar space of V2CTx is certain to have large accommodation for MB. The electrostatic interaction effect and hydrogen bond between V2CTx and MB not only promote the efficient adsorption process but also provide the selectivity between anionic and cationic dyes. Combined with good reusability, we anticipate that the V2CTx MXene is a promising candidate for the removal of cationic dyes from textile-dye-bearing wastewaters.