Enhancement of Cd <sup>2+</sup> removal from aqueous solution by multifunctional mesoporous silica: Equilibrium isotherms and kinetics study

Publication Type:
Journal Article
Citation:
Separation and Purification Technology, 2019, 224 pp. 199 - 208
Issue Date:
2019-10-01
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10.1016j.seppur.2019.05.017.pdfAccepted Manuscript Version899.55 kB
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© 2019 In this work, a novel amino-functionalized mesoporous microsphere was synthesized to remove cadmium ions from water. The Fe 3 O 4 @SiO 2 @m-SiO 2 –NH 2 micro-spheres were successfully prepared via a facile two-stage process by coating of the as-synthesized magnetic cores with a silica shell followed by increasing the porosity of the structure using a cationic surfactant as structure-directing agents. The template removal from the structure has been performed following the method of solvent extraction and methanol-enhanced supercritical fluid CO 2 (SCF-CO 2 )extraction. This novel approach provides the multifunctional microspheres with a high surface area, which improves the adsorption capacity of adsorbent. Characterization of the as-synthesized adsorbent were analytically determined showing that as-prepared adsorbent has a significant surface area of 637.38 m 2 g −1 . The kinetic data agreed with pseudo-second-order model and Langmuir isotherm. The maximum adsorption capacity of the synthesized adsorbent was about 884.9 mg g −1 , and can be easily separated from solution under an external magnetic field. The synthesized microspheres were recycled using HCl and cadmium removal was over 92% after 6 cycles, which confirms the chemical stability and reusability of the manufactured particles.
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