期刊
2D MATERIALS
卷 10, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2053-1583/acbd62
关键词
MXene; adsorption; competitive removal; heavy metals; chitosan; lignosulfonate
A novel Ti3C2T(x) MXene/chitosan/lignosulfonate adsorbent (MCL) was prepared to improve the biocompatibility and aqueous stability of MXenes by decorating MXene sheets with chitosan/lignosulfonate nanospheres. MCL exhibited a preferential adsorption affinity towards various heavy metal ions, and the adsorption mechanism involves electrostatic interaction, surface complexation, and ion exchange. The findings of this study provide a new approach for eco-friendly MXene surface modification and offer insights into metal pollutants interactions during adsorption.
In this work, a novel Ti3C2T (x) MXene/chitosan/lignosulfonate adsorbent (MCL), was prepared via a facile decoration of Ti3C2T (x) 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) approximate to Cu(II) > Ni(II) approximate to 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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