Abstract
Mxene has been widely used as a sorbent to remove heavy metal ions from sewage due to its unique two-dimensional layered structure and abundant oxygen-containing groups. However, Mxene has a relatively limited adsorption capacity for metal ions possibly due to the limited adsorption active sites. Herein, we reported novel Mxene/alginate composites for lead and copper ion removal from wastewater. The Mxene/alginate composites prepared in this study not only enhance the chelation ability of the lead and copper ions, but also accelerate the ion transport efficiency. The combined advantages of high adsorption capacity and short equilibrium time enable the Mxene/alginate composites to achieve the maximum adsorption capacity for Pb2+ and Cu2+ at 382.7 and 87.6 mg g−1, respectively, and reach the adsorption equilibrium in 15 min. We believe that the composites developed in this study can open a new avenue for designing high adsorption capacity and high efficiency adsorbents.
Highlights
With the rapid development of industrial economy, heavy metal pollution has become one of the most serious environmental problems in recent decades.[1]
Ci À Cf VM m where Ci and Cf represent the concentration of metal ions in solution before and a er adsorption, respectively; V is the volume of the solution (L); M is the molar mass of the metal ions (g molÀ1); and m is the mass of the Mxene/alginate composite (g)
Compared with pure Ti3C2Tx, the Mxene/ alginate composites have a rougher surface (Fig. 1D), which provides a superior environment for Pb2+ and Cu2+ adsorption
Summary
With the rapid development of industrial economy, heavy metal pollution has become one of the most serious environmental problems in recent decades.[1]. There is no doubt that it poses a great threat to the ecological environment and human health.[1,2] the ability to efficiently remove heavy metal ions from water has gradually become the focus of environmental researchers. Shahzad et al synthesized Ti3C2Tx Mxene nanosheets for an efficient copper removal from water.[7] Ying et al fabricated 2D Ti3C2Tx with regular structure by HF etching, which showed superior performance for the adsorption of chromium.[8] These Mxene materials have shown potential in the treatment of heavy metals. A large number of amino and carboxyl groups in alginate have good chelating ability for heavy metal ions, which can signi cantly increase the adsorption capacity of the composites. We demonstrated that Mxene/alginate composites are a promising sorbent for heavy metal treatment
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