Journal
CARBOHYDRATE POLYMERS
Volume 312, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2023.120834
Keywords
Chitosan-polyethyleneimine; Biochar; Adsorption; Uranium(VI)
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A chitosan-based composite with rich active sites was synthesized by combining biochar, chitosan, and polyethyleneimine. The composite showed excellent adsorption performance for uranium(VI), with a high adsorption efficiency and capacity. It also demonstrated effectiveness in various water environments and met the permissible limits for uranium(VI) removal. Overall, this novel chitosan-based composite has great potential for remediating uranium(VI) contaminated wastewater.
A novel chitosan-based composite with rich active sites was synthesized by uniformly dispersing biochar into the cross-linked network structure formed by chitosan and polyethyleneimine. Due to the synergistic effect of bio-char (minerals) and chitosan-polyethyleneimine interpenetrating network (amino and hydroxyl), the chitosan-based composite possessed an excellent adsorption performance for uranium(VI). It could rapidly (<60 min) achieve a high adsorption efficiency (96.7 %) for uranium(VI) from water and a high static saturated adsorption capacity (633.4 mg/g), which was far superior to other chitosan-based adsorbents. Moreover, the separation for uranium(VI) on the chitosan-based composite was suitable for a variety of actual water environments and the adsorption efficiencies all exceeded 70 % in different water bodies. The soluble uranium(VI) could be completely removed by the chitosan-based composite in the continuous adsorption process, which could meet the permis-sible limits of the World Health Organization. In sum, the novel chitosan-based composite could overcome the bottleneck of current chitosan-based adsorption materials and become a potential adsorbent for the remediation of actual uranium(VI) contaminated wastewater.
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