Journal
ENVIRONMENTAL POLLUTION
Volume 264, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.114785
Keywords
Water hyacinths; Biochar-alginate capsule; Heavy metals; Langmuir and freundlich isotherms; Isotherms
Categories
Funding
- China National Key R&D Program during the 13th Five-Year Plan [2016YFD0501404-3]
- Fujian Province Public Welfare Scientific Research Program [2019R1021-2]
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Biochar produced from water hyacinths (Eichhornia crassipes) has been demonstrated to be an effective adsorbent for the removal of certain heavy metals and as a means of control for this highly invasive species. This study involved examined the Cd2+ sorption dynamics of an alginate encapsulated water hyacinth biochar (BAC) generated at different temperatures and modified using ferric/ferrous sulfate (MBAC). The maximum Cd2+ sorption occurred at a pH of 6 and at a solution temperature of 37 degrees C. Sorption equilibria for the biochar-alginate capsule (BAC) and modified biochar-alginate capsule (MBAC) treatments fit both the Langmuir (R-2 = 0.876 to 0.99) and Freundlich (R-2 = 0.849 to 0.971) equations. Langmuir isotherms had a better fit than the Freundlich isotherms, with maximum sorption capacities ranging from 24.2 to 45.8 mg Cd2+ g(-1). Larger K-L values in Freundlich modeling suggest strong bonding of the BAC and MBAC sorbents to Cd2+, with values of K-L in the MBAC treatments ranging between 31 and 178% greater than the BAC treatments. Cd2+ sorption followed pseudo first-order kinetics (R-2 = 0.926 to 0.991) with greater efficiency of removal using treatments with biochar generated at temperatures >500 degrees C. Results from this study highlight the potential for biochar-alginate capsules derived from water hyacinth to be effective for the removal of Cd2+ from wastewaters. (C) 2020 Elsevier Ltd. All rights reserved.
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