Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 25, Issue 4, Pages 830-837Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60141-7
Keywords
heavy metals; adsorption; magnetic mesoporous microspheres; amino-functionalization
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Funding
- National Natural Science Foundation of China [21007048]
- Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period [2012BAF03B06, 2012BAJ25B06]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRY11011, PCRRF11003]
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Amino-functionalized Fe3O4@mesoporous SiO2 core-shell composite microspheres NH2-MS in created in multiple synthesis steps have been investigated for Pb(II) and Cd(II) adsorption. The microspheres were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), N-2 adsorption-desorption, zeta potential measurements and vibrating sample magnetometer. Batch adsorption tests indicated that NH2-MS exhibited higher adsorption affinity toward Pb(II) and Cd(II) than MS did. The Langmuir model could fit the adsorption isotherm very well with maximum adsorption capacity of 128.21 and 51.81 mg/g for Pb(II) and Cd(II), respectively, implying that adsorption processes involved monolayer adsorption. Pb(II) and Cd(II) adsorption could be well described by the pseudo second-order kinetics model, and was found to be strongly dependent on pH and humic acid. The Pb(II)- and Cd(II)-loaded microspheres were effectively desorbed using 0.01 mol/L HCl or EDTA solution. NH2-MS have promise for use as adsorbents in the removal of Pb(II) and Cd(II) in wastewater treatment processes.
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