Table 1.

MXene/CNT composites obtained by different methods and their features.

Composite	Synthesis Method	Additive	Morphological Features	Adsorption Capabilities	Source
Ti3C2Tx/CNTs	Electrostatic self-assembly	basalt fiber-reinforced polymer, epoxy	Uniform thickness; Basalt fibers tightly embedded in matrix composites	Synergistic effect of MXene/CNT/epoxy composite; High stability in alkaline environments	[118]
Ti3C2Tx/CNTs	CVD	-	Uniform growth CNTs with a diameter from 40 to 90 nm; Ti3C2Tx layered particles, a common network of Ti3C2Tx/CNTs	n/a	[123]
Ti3C2Tx/CNTs-cetyltrimethylammonium bromide on nanofiltration membrane	Vacuum-assisted filtration	cetyltrimethylammonium bromide	Membranes with a layered structure had a larger gap between them; The interfacial adhesion force was increased by 6 times compared to the MXene membrane	Membrane has excellent mechanical strength and solvent resistance during molecular sieving; The permeability of pure water increased up to 5 times, with 20.09 L/m2·h·bar to 100.89 L/m2·h·bar	[119]
Ti3C2Tx/CNTs	Electrophoretic deposition	-	CNT provides maximum ion access to ion intercalation sites by increasing the distance between the layers of the MXene nanolayer.	Efficient and fast hybrid capacitive deionization; High fiber hydrophilicity; Specific capacity (178 F/g); Low degreasing resistance; High electrochemical stability (90%); After 1500 cycles and maximum Na+ diffusion coefficient; It can provide an energy-efficient desalination process and outstanding desalination stability with a retention rate of 89% after 40 cycles	[126]
Ti3C2Tx/functionalized CNTs	Thermal treatment	PDA-modified α-Al2O3	1D CNTs are well dispersed and embedded in two-dimensional MXene nanoliths; The formation of a homogeneous network and continuous three-dimensional (3D) labyrinthine short mass transfer channels	Improved permeability; Pronounced ability to suppress swelling; Stability	[127]
Dual-phase MoS2/Ti3C2Tx/CNT	One-step bisolvent solvothermal synthesis technique	1 T enriched-MoS2	Triple hybrid structure; Two-phase MoS2 (DP-MoS2) is formed directly on MXene, while CNTs act as crosslinking between 2D islands; MoO2 suppresses oxidation of MXene and rearrangement of 2D layers	Increasing the surface area to 32 m2/g	[129]
Ti3C2/knotted CNTs	CVD	the catalyst Ni–Mn–Al–O	Formation of a three-dimensional network architecture; CNT nodules with a size of 200 ± 20 nm; The average Ti3C2 flake size is ~250 nm; Ti3C2/CNT in the form of a sponge	n/a	[122]
Ti3C2Tx/CNT/waterborne polyurethane	Sonication	waterborne polyurethane	Free and uniform film with a thickness of 90 µm;	n/a	[130]
Ti3C2Tx/ Carboxylated-CNTs microspheres	Self-assembly	-	Layered structure of Ti3C2Tx MXene nanosheets with thickness 1.32 nm; Spherical hierarchical 3D structure of composite with typical shrinkage morphology	BET Surface Area 48.64 m2/g; Pore Volume 0.1462 cm3/g; Pore Size 24.19 nm	[125]
Ti3C2Tx/CNTs	Dip-coating	thermoplastic polyurethane nonwoven fabric	Hypersensitive microcrack structure; Porous fibrous mesh structure	Stability at high temperatures; The synergistic effect of the MXene/CNTs conductive coating	[128]
MXene/sodium lignosulfonate CNT	Self-assembly	sodium lignosulfonate, polyethersulfone substrate pretreated with dopamine	Uniform distribution; Structural integrity	The MB and CR dyes retention efficiency was more than 99% with a permeation flux of 51.6 L/m2·h·bar; This membrane shows electrocatalytic efficiency, whereby it degrades various organic dyes (MO, MB, MG, RhB) within 1 h; It has 80% recovery capacity	[134]