Abstract
An efficient route is proposed to synthesize a novel three-dimensional (3D) magnetic MXene aerogel (3D MXene/Fe3O4). 3D MXene were synthesized by self-assembly of 2D MXene Ti3C2Tx using ethylenediamine (EDA) as crosslinking inducer, then Fe3O4 was in situ coprecipitation onto 3D MXene. 3D MXene/Fe3O4 was applied as an adsorbent for Ag(I) removal from aqueous solutions. 3D MXene/Fe3O4 exhibits a cross-linked 3D porous network with magnetic Fe3O4 nanoparticles uniformly dispersed on its surface and edges. The maximum adsorption capacity of 3D MXene/Fe3O4 for Ag(I) was 2385 mg g−1. The kinetics and isothermal process during adsorption were described accurately by the pseudo-second-order model and the Freundlich isotherm model, and the adsorption process was driven by chemisorption and multilayer adsorption, where the diffusion mechanism involved surface diffusion and intraparticle diffusion. Furthermore, the 3D MXene/Fe3O4 are recyclable, retaining 71% of the initial removal rate after 5 adsorption/desorption cycles.
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