Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 612, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.126013
Keywords
Fe-Mn co-embed carbon spheres; Adsorbent; Cadmium; Mechanism
Categories
Funding
- Anhui Laboratory of Molecule-Based Materials [fzj19011]
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Fe-Mn/SA-C prepared in this study is a cost-effective adsorbent for Cd(II) removal, showing excellent adsorption capacity and multiple adsorption mechanisms, making it suitable for treatment of cadmium-containing wastewater.
In this study, Fe-Mn co-embed sodium alginate carbon spheres (Fe-Mn/SA-C) were prepared as a cost-effective adsorbent for aqueous Cd(II) removal by a facile pyrolysis method. The morphology and chemical composition of Fe-Mn/SA-C were explored with various characterized techniques. The results indicate that Fe-Mn/SA-C possess porous structures and abundant oxide-based functional groups. Fe-Mn/SA-C exhibits excellent adsorption properties for aqueous Cd(II) and the adsorption process is pH-dependent. The adsorption data could fit pseudo second-order and Langmuir models well, suggesting that chemisorption is a dominant adsorption mechanism and the maximum adsorption capacity is 280.11 mg(-1). Thermodynamic analysis demonstrates that the adsorption is spontaneous and endothermic. The adsorption mechanisms of Cd(II) include the complexation of Cd(II) with oxygen-based functional groups, precipitation, and ion exchange. Finally, the granulated and magnetic Fe-Mn/SA-C is an efficient and practical adsorbent for cadmium-containing wastewater treatment.
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