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Novel polyethyleneimine functionalized chitosan–lignin composite sponge with nanowall-network structures for fast and efficient removal of Hg(ii) ions from aqueous solution

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Abstract

Adsorption of heavy metals by natural polymeric composites has attracted extensive attention due to their abundance, low cost, and eco-friendliness, but these composites tend to have low adsorption capacity, long response time and poor selectivity. Therefore, it is critically desired to develop an eco-friendly adsorbent that can remove heavy metal ions efficiently and quickly from aqueous solution. Here, a novel polyethyleneimine functionalized chitosan–lignin (PEI-CS-L) composite sponge adsorbent with nanowall-network structures is synthesized by cross-linking and lyophilization. Notably, the as-prepared adsorbent could remove Hg(II) ions selectively from an aqueous solution with high efficiency at a very quick response time, reaching >83.5% of the ultimate adsorption within just 1 min. This is attributed to the evenly interconnected porous structure of the composite sponge with nanoscale-wall structures which increase the distribution of functional groups, leading to the fast complexation of heavy metal ions with surface functional groups. It is worth noting that the PEI-CS-L sponge has excellent reusability, and its adsorption capacity only decreased by 4.09% after 5 cycles of adsorption and desorption. Considering its eco-friendliness, high efficiency and low cost, the developed PEI-CS-L sponge hold great promise in removing Hg(II) ions from wastewater.

Graphical abstract: Novel polyethyleneimine functionalized chitosan–lignin composite sponge with nanowall-network structures for fast and efficient removal of Hg(ii) ions from aqueous solution

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Supplementary files

Article information


Submitted
30 Nov 2019
Accepted
08 Jan 2020
First published
08 Jan 2020

Environ. Sci.: Nano, 2020, Advance Article
Article type
Paper

Novel polyethyleneimine functionalized chitosan–lignin composite sponge with nanowall-network structures for fast and efficient removal of Hg(II) ions from aqueous solution

D. Zhang, L. Wang, H. Zeng, B. Rhimi and C. Wang, Environ. Sci.: Nano, 2020, Advance Article , DOI: 10.1039/C9EN01368G

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