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Ti 3 C 2 T x MXene has attracted considerable interest as a new emerging two-dimensional material for environmental remediation due to its high adsorption capacity. However, its use is greatly limited by its poor mechanical properties, low processability and recyclability, and the low dispersity of such powder materials. In this work, a porous adsorbent (C-CMP) containing cellulose nanocrystals (CNC), Ti 3 C 2 T x MXene and polyvinyl alcohol (PVA) was prepared by a simple and environmentally-friendly foaming method. Glutaraldehyde was used as crosslinker to improve the mechanical properties and boost the adsorption efficiency of methylene blue (MB) molecules. Fourier transform infrared (FT-IR), elemental analysis (EDX) and thermogravimetric analysis (TGA) further confirmed that the preparation of the C-CMP foam and cross-linking reaction were successful. Scanning electron microscope (SEM) indicated that the macropores were distributed homogeneously. The adsorption experiment showed that maximum adsorption capacity of MB can reach 239.92 mg·g -1 which was much higher than anionic dye (methyl orange, 45.25 mg·g -1 ). The adsorption behavior fitted well with the Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic. Based on FT-IR, EDX and X-ray photoelectron spectroscopy (XPS) analysis, the adsorption mechanism between C-CMP and MB molecules was attributed to electrostatic interaction.

One-Pot Synthesis of Cellulose/MXene/PVA Foam for Efficient Methylene Blue Removal