Experimental study demonstrates efficient lead removal using chitosan and tungsten disulfide aerogels, suggesting a sustainable approach for purifying contaminated water.
Building aerogels-based adsorbents with high adsorption capacity, selectivity, and structure designing through green and simple ways was urgent issue for the removal of Pb 2+ from contaminated water. In this study, for the first time, chitosan was applied as assistant agents for the liquid-phase exfoliation of WS 2 nanosheets, and the composite aerogels (CS/WS 2 ) with oriented microchannel structures were obtained via directional co-assembly processes. Owing to the potential H-bond between CS and WS 2 , as well as the sulfur-rich surfaces, CS/WS 2 aerogels exhibited promising Pb 2+ adsorption performance (~275.9 mg/g) than many other chitosan-based adsorbents. Besides, the adsorption of Pb 2+ by CS/WS 2 aerogels were also rapid (reached an equilibrium at ~120 min), selective (~54% of maximal Pb 2+ uptake), and sustainable (maintained ~90% of the maximal uptake). This work paved a simple and green way to construct WS 2 nanosheets-based aerogels with delicate micro-structures and favorable Pb 2+ adsorption performances.
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Yuan et al. (2023) studied this question.
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