Authors
Seyed Jamaleddin Peighambardoust, Somayyeh Rezaei-Aghdam, Javaneh Sakhaei Niroumand, Parisa Mohammadzadeh Pakdel, Mika Sillanpää
Published in
RSC advances. Volume 15. Issue 39. Pages 32407-32423. Sep 05, 2025. Epub Sep 08, 2025.
Abstract
A free radical polymerization approach was applied to synthesize different carboxymethyl cellulose-grafted poly(acrylamide) hydrogels (Hyd) composited with biochar, magnetic biochar, and magnetic biochar decorated with ZIF-67 to decontaminate methylene blue (MB) from water media. Biochar was obtained from walnut shells (WS) by a pyrolysis method, and magnetic biochar (WS/CoFe2O4) and biochar-decorated ZIF-67 (WS/CoFe2O4/ZIF-67) were prepared by chemical co-precipitation and hydrothermal methods, respectively. An increase in the amount of these particles by up to 10 wt% enhanced the removal performance. The maximum removal performance by Hyd, Hyd/WS, Hyd/WS/CoFe2O4, and Hyd/WS/CoFe2O4/ZIF-67 was computed to be 85.74%, 91.74%, 95.83%, and 97.72%, respectively, at optimum conditions of pH = 10, adsorbent dose = 1 g L-1, contact time = 50 min, initial concentration = 10 mg L-1, and temperature = 25 °C. Pseudo-second-order kinetic and the Freundlich isotherm models had the highest desirability in the kinetic and equilibrium data regression, respectively. The thermodynamic study showed the spontaneity and exothermic nature of the MB decontamination process. Ultimately, the synthesized adsorbents, specifically Hyd/WS/CoFe2O4/ZIF-67, could be used for wastewater treatment.
PMID:
40927482
Bibliographic data and abstract were imported from PubMed on 10 Sep 2025.
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