J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (6): 999-1007.DOI: 10.1016/j.jmst.2017.07.007
• Orginal Article • Previous Articles Next Articles
Birong Zeng*(), Li Yang, Wei Zheng, Jihong Zhu, Xiaojun Ma, Xinyu Liu, Conghui Yuan, Yiting Xu, Lizong Dai
Received:
2017-03-24
Revised:
2017-05-09
Accepted:
2017-06-01
Online:
2018-06-10
Published:
2018-06-05
Contact:
Zeng Birong
Birong Zeng, Li Yang, Wei Zheng, Jihong Zhu, Xiaojun Ma, Xinyu Liu, Conghui Yuan, Yiting Xu, Lizong Dai. Analysis of the formation process and performance of magnetic Fe3O4@Poly(4-vinylpyridine) absorbent prepared by in-situ synthesis[J]. J. Mater. Sci. Technol., 2018, 34(6): 999-1007.
Sample | a1 | a2 | a3 | a4 | a5 | A1 | A2 | A3 | A4 | A5 |
---|---|---|---|---|---|---|---|---|---|---|
Molar ratio | [FeCl3·6H2O]: [NaAc] = 1: 14 | [FeCl3·6H2O]:[NaAc]:[4-VP] = 1: 14: 2 | ||||||||
Reaction time (h) | 2 | 4 | 8 | 12 | 24 | 2 | 4 | 8 | 12 | 24 |
Table 1 Ten samples of Fe3O4 nanospheres prepared by solvothermal method.
Sample | a1 | a2 | a3 | a4 | a5 | A1 | A2 | A3 | A4 | A5 |
---|---|---|---|---|---|---|---|---|---|---|
Molar ratio | [FeCl3·6H2O]: [NaAc] = 1: 14 | [FeCl3·6H2O]:[NaAc]:[4-VP] = 1: 14: 2 | ||||||||
Reaction time (h) | 2 | 4 | 8 | 12 | 24 | 2 | 4 | 8 | 12 | 24 |
Fig. 1. SEM images of Fe3O4 nanospheres of samples a1-a5 prepared without 4-VP for (a) 2, (b) 4, (c) 8, (d) 12 and (e) 24 h reaction time. (f) Magnified image of (c). SEM images of mesoporous Fe3O4@P4-VP composites of samples A1-A5 prepared with 4-VP for (g) 2, (h) 4, (i) 8, (j) 12 and (k) 24 h reaction time. (?) Magnified image of (i).
Fig. 2. XRD spectra of Fe3O4 nanospheres of samples a1-a5 prepared without 4-VP for (a) 2, (b) 4, (c) 8, (d) 12 and (e) 24 h reaction time. XRD spectra of mesoporous Fe3O4@P4-VP composites of samples A1-A5 prepared with 4-VP for (g) 2, (h) 4, (i) 8, (j) 12 and (k) 24 h reaction time.
Fig. 3. TEM images of mesoporous Fe3O4@P4-VP composites of samples A2-A5 prepared with 4-VP for (a) 4, (b) 8, (c) 12 and (d) 24 h reaction time. The inset in (b) shows an electron-diffraction pattern of sample A3.
Fig. 6. (a) TG characterization of mesoporous Fe3O4@P4-VP composites, (b) magnetic hysteresis curves of Fe3O4 nanospheres and Fe3O4@P4-VP composites, (c) nitrogen adsorption-desorption isotherms of Fe3O4 nanospheres, and (d) nitrogen adsorption-desorption isotherms of Fe3O4@P4-VP composites. The insets are the corresponding pore size distribution curves.
Fig. 7. (a) UV absorption curve of Congo red, (b) the standard concentration curve for Congo red, (c) the relationship of adsorption capacity vs adsorption time of Congo red on Fe3O4 nanospheres, (d) adsorption isotherm of Congo red on mesoporous Fe3O4@P4-VP composites. The inset is the Langmuir fitting line.
T (K) | Langmuir model | Freundlich model | ||||
---|---|---|---|---|---|---|
Qm(mg g-1) | KL | R2 | KF | 1/n | R2 | |
298 | 151.5 | 1.3 | 0.9996 | 96.4 | 0.13 | 0.8359 |
Table 2 Isotherm parameters for the adsorption of Congo red on sample A4.
T (K) | Langmuir model | Freundlich model | ||||
---|---|---|---|---|---|---|
Qm(mg g-1) | KL | R2 | KF | 1/n | R2 | |
298 | 151.5 | 1.3 | 0.9996 | 96.4 | 0.13 | 0.8359 |
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