| Amino-functionalized core-shell magnetic mesoporous composite microspheres for Pb(II) and Cd(II) removal |
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| 作者姓名： | Yulin Tang Song Liang Juntao Wang Shuili Yu Yilong Wang |
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| 作者单位： | State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, China;State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, China;The Institute for Biomedical Engineering & Nano Science, Tongji University, Shanghai 200092, China;State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science & Engineering, Tongji University, Shanghai 200092, China;The Institute for Biomedical Engineering & Nano Science, Tongji University, Shanghai 200092, China |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China (No. 21007048), the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (No. 2012BAF03B06, 2012BAJ25B06), and partial fund of the State Key Laboratory of Pollution Control and Resource Reuse Foundation (No. PCRRY11011, PCRRF11003). |
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| 摘 要： | Amino-functionalized Fe3O4@mesoporous SiO/ 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）, N2 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 HC1 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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| 关 键 词： | heavy metals adsorption magnetic mesoporous microspheres amino-functionalization |
| 收稿时间： | 22 August 2012 |
| 修稿时间： | 30 October 2012 |
Amino-functionalized core-shell magnetic mesoporous composite microspheres for Pb(II) and Cd(II) removal |
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| Yulin Tang,Song Liang,Juntao Wang,Shuili Yu,Yilong Wang.Amino-functionalized core-shell magnetic mesoporous composite microspheres for Pb(II) and Cd(II) removal[J].Journal of Environmental Sciences,2013,25(4):830-837. |
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| Authors: | Yulin Tang Song Liang Juntao Wang Shuili Yu and Yilong Wang |
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| Institution: | 1. State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science (&) Engineering,Tongji University,Shanghai 200092,China
2. The Institute for Biomedical Engineering(&)Nano Science, Tongji University, Shanghai 200092, China |
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| Abstract: | 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), N2 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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| Keywords: | heavy metals adsorption magnetic mesoporous microspheres amino-functionalization |
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