Nanoscale zero-valent iron intercalated 2D titanium carbides for removal of Cr(VI) in aqueous solution and the mechanistic aspect.

J Hazard Mater

Institute of Materials, China Adcademy of Engineering Physics, No. 9, Huafengxincun, Jiangyou City, Sichuan Province, 621908, PR China. Electronic address:

Published: April 2020

AI Article Synopsis

  • MXenes are emerging 2D materials suitable for removing heavy metals, especially radioactive elements, due to their irradiation stability, but their small interlayer distance and surface limitations hinder further use.
  • In this study, nanoscale zero-valent iron (nZVI) was introduced into the interlayer of alkaline intercalated TiC (Alk-TiC) to enhance Cr(VI) removal, with results showing improved uptake capacity due to increased active sites and expanded interlayer space.
  • The nZVI-Alk-TiC composite effectively removed Cr(VI) even with other cations present, demonstrating its potential for environmental cleanup, driven by synergistic effects between nZVI and Alk-TiC.

Article Abstract

MXenes, as new members of the 2D materials group, are regarded as good candidates for heavy metal removal particularly for radioactive metal element because of their high irradiation stability. However, the small interlayer distance and lack of active sites on the surface limit their further application. In this report, nanoscale zero-valent iron has been introduced into the inter-layer structure of alkaline intercalated TiC (Alk-TiC) and investigated to Cr(VI) removal. The XPS spectra, SEM images, TEM images, and N adsorption-desorption isotherms characterizations revealed that the OH groups on the Alk-TiC surface assisted the introducing of nZVI into the inter-layer of Alk-TiC and subsequently stabilized the nZVI. The increased active sites of nZVI and extended interlayer space of Alk-TiC could improve the uptake capacity of Cr(VI) (194.87 mg/g at pH = 2). The highly efficient removal of Cr(VI) was maintained even in the presence of coexisting cations, which showed great potential for real environment remediation. Mechanistic study indicated that the synergistic effects of nZVI and Alk-TiC nanosheet in nZVI-Alk-TiC composites are keys for Cr(VI) removal.

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http://dx.doi.org/10.1016/j.jhazmat.2019.121761DOI Listing

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