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Preparation of amino-functionalized CoFe 2 O 4 @SiO 2 magnetic nanocomposites for potential application in absorbing heavy metal ions
Amino-functionalized nanocomposites with a magnetic CoFe 2 O 4 core and an amorphous SiO 2 shell have been designed and synthesized. The core–shell structure was characterized by SEM, EDS, TEM, FTIR and XPS. CoFe 2 O 4 @SiO 2 –NH 2 with a high saturated magnetization (28.09 emu g −1 ) can be easily...
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| Published in: | RSC advances 2016, Vol.6 (76), p.72479-72486 |
|---|---|
| Main Authors: | , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Amino-functionalized nanocomposites with a magnetic CoFe
2
O
4
core and an amorphous SiO
2
shell have been designed and synthesized. The core–shell structure was characterized by SEM, EDS, TEM, FTIR and XPS. CoFe
2
O
4
@SiO
2
–NH
2
with a high saturated magnetization (28.09 emu g
−1
) can be easily separated under a moderate external magnetic field within one minute. In addition, the adsorption capacity of the CoFe
2
O
4
@SiO
2
–NH
2
for Cu(
ii
), Cd(
ii
) and Mn(
ii
) was 170.829, 144.948 and 110.803 mg g
−1
, respectively. The removal efficiency was increased from 12 to 85% with an increase in the pH from 4 to 6.5. The adsorbent can be recycled for at least four cycles with a feasible removal efficiency (85.41%). The adsorption process was fitted by pseudo-second-order kinetics and a Langmuir isotherm model. Based on the data of the present investigation, CoFe
2
O
4
@SiO
2
–NH
2
could find potential applications in heavy metal ion wastewater treatment. |
|---|---|
| ISSN: | 2046-2069 2046-2069 |
| DOI: | 10.1039/C6RA13304E |