Advancements of 2D Materials-Based Membranes

Othman, Zakarya; Mahmoud, Khaled A.

doi:10.3390/membranes12010052

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“…MXenes, two-dimensional (2D) transition metal carbides, nitrides, and carbonitrides produced by selective etching of their MAX phases, have gained wide interest in many applications due to their intrinsic structural, electrical, and chemical properties, including adsorption of organic and inorganic contaminants [20][21][22][23][24][25][26], photocatalysis [27][28][29], water treatment membranes [30], capacitive deionization [31] and antimicrobial applications [32]. The titanium carbide (Ti 3 C 2 T x ) is the most common form of MXenes and is still receiving significant attention due to its availability, large surface area, hydrophilic behavior, the abundance of surface functional groups (such as O, OH, F, or Cl), high conductivity and environmentally friendly characteristics [29,33].…”

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confidence: 99%

MXene/chitosan/lignosulfonate (MCL) nanocomposite for simultaneous removal of Co(II), Cr(VI), Cu(II), Ni(II) and Pb(II) heavy metals from wastewater

Othman

Mackey²,

Mahmoud³

2023

2D Mater.

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In this work, a novel Ti3C2Tx MXene/ chitosan/lignosulfonate adsorbent (MCL), was prepared via a facile decoration of Ti3C2Tx MXene sheets with chitosan/lignosulfonate nanospheres as a renewable and biodegradable additive that can improve the biocompatibility and aqueous stability of MXenes. Chitosan/lignosulfonate nanospheres were stabilized on the surface of MXne sheets, endowing them with a variety of surface functionalities, high specific surface area, and antioxidant characteristics. The competitive adsorption of multi-metal systems revealed that MCL had a preferential adsorption affinity toward various heavy metal ions; the MCL removal efficiency for the quinary-metal ions adsorption followed a trend of Pb(II) > Cr(VI) ≈ Cu(II) > Ni(II) ≈ Co(II) in neutral pH conditions. A moderate reduction was observed for Cu(II) and Cr(VI) ions. For all metals, the kinetics data fitted well with the pseudo-second-order model, and the adsorption equilibrium was best described by the Langmuir model. The adsorption mechanism is suggested to be a synergic combination of electrostatic interaction, surface complexation, and ion exchange. The findings of this study provide a new approach for eco-friendly MXene surface modification and give a general pattern of metal pollutants interactions during adsorption.

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