Self-assembling 2D/2D (MXene/LDH) materials achieve ultra-high adsorption of heavy metals Ni2+ through terminal group modification

By Xiaofang Feng, Zongxue Yu, Runxuan Long, Xiuhui Li, Liangyan Shao, Haojie Zeng, Guangyong Zeng, Y. Zuo. 2020

143 citations recorded by the source corpus.

Abstract The application of two-dimensional metal carbides (MXenes) in heavy metal processing has attracted more and more attention. In this experiment, using titanium carbide as a 2D platform, an atomic-scale 2D/2D adsorbent alk-MXene/LDH was constructed by in situ mechanical self-assembly and alkali-level intercalation to remove Ni2+. Due to its unique layered structure, the oxidized functional groups and available active binding sites of MXene nanoplatelets constitute a unique adsorbent for removing heavy metals in water. The adsorption capacity of alk-MXene/LDH adsorbent for Ni2+ was 222.717 mg/g. The efficiency of Ni2+ was 97.35%, and the synthesized material could efficiently remove Ni2+ under a wide range of pH conditions (pH = 5–13). The adsorption behavior was studied using Redlich-Peterson adsorption isotherms, pseudo-second-order kinetics and thermodynamic models. In this study, the adsorbent exhibited excellent reproducibility after 8 adsorption-desorption cycles. According to the experimental results and various characterizations, the mechanism of the adsorbent was revealed. This study indicates that the atomic scale 2D/2D large basal plane has great potential in adsorbents.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b3e2c95aaa8cced3a4d7fb97dd3611186b5985cf