1. Experimenting with APAN
Nanofibers
Emily Jeng
鄭家韻
Taiwan Tech Trek 2014
1

2. 宜蘭大學
National I-Lan
University 2

3. 3

4. PAN Solution
PAN: 0.800 g DMAC: 15 mL
4-6 hrs
4

5. Electrospinning
NeedleRolling Drum
Syringe (with
solution)
Generator
Tubing
5

6. PAN Nanofibers
6

7. Making APAN
Nanofibers
15 g NaOH+85 mL water
30 min reaction
DETA+water+1 g Na2CO3
1 hour reaction
7

8. Cu Adsorption
Experiments 8

9. ICP
9

10. Experimental Parameters Changed
• Percentage of DETA added for
reaction:
• 0% (PAN nanofibers)
• 10%
• 20%
• 30%
• Different Cu(II)
Concentrations:
• 5 ppm
• 10 ppm
• 20 ppm
• 40 ppm
10

11. RESULTS 11

12. Na2CO3
PAN
DETA
APAN
12

13. Effect of
Concentration
13

14. Effect of DETA
14

15. Adsorption Capacities
𝑞𝑒 =
𝐶𝑜 − 𝐶𝑓 ∗ 𝑉
𝑚
• qe=adsorption capacity
• Co=initial concentration
• Cf=final concentration
• V=volume
• m=mass of absorbent
5 ppm 10 ppm 20 ppm 40 ppm
0% DETA 0.401
mg/g
0.475
mg/g
0.709
mg/g
1.967
mg/g
10% DETA 1.072
mg/g
2.316
mg/g
3.303
mg/g
5.793
mg/g
20% DETA 1.134
mg/g
1.861
mg/g
3.194
mg/g
4.137
mg/g
30% DETA 1.230
mg/g
2.430
mg/g
4.778
mg/g
8.048
mg/g
15

16. Kinetics Analysis
𝐹𝑖𝑟𝑠𝑡 𝑂𝑟𝑑𝑒𝑟: 𝐿𝑜𝑔 𝑞𝑒 − 𝑞𝑡 = 𝐿𝑜𝑔 𝑞𝑒 −
𝑘1
2.303
𝑡 𝑆𝑒𝑐𝑜𝑛𝑑 𝑂𝑟𝑑𝑒𝑟:
𝑡
𝑞𝑡
=
1
𝑘2 ∗ 𝑞𝑒2
+
𝑡
𝑞𝑒
16

17. Kinetics Comparison
First Order
5 ppm 10 ppm 20 ppm 40 ppm
R2 0.9754 0.9317 0.9881 0.9064
Qe exp
(mg/g)
0.9853 1.806 2.324 2.458
Qe
calc
(mg/g)
1.124 1.791 2.232 2.094
k1 0.08682 0.06402 0.04813 0.06974
Second Order
5 ppm 10
ppm
20
ppm
40
ppm
R2 0.998 0.9327 0.9461 0.9378
Qe exp
(mg/g)
0.9853 1.806 2.324 2.458
Qe
calc
(mg/g)
1.120 2.428 3.531 3.263
k2 0.1376 0.0238 0.2832 0.3065
17

18. Adsorption Isotherms
• Langmuir Isotherm: adsorption onto
homogenous surface with finite
number of adsorption sites.
qe = qm ∙
bCe
1 + bCe
Or
𝑪𝒆
𝒒𝒆
=
𝑪𝒆
𝒒𝒎
+
𝟏
𝒃∗𝒒𝒎
Where Ce=equilibrium concentration
qe= equilibrium adsorption capacity
qm=maximum adsorption capacity
b=Langmuir adsorption constant (energy
of adsorption)
18

19. Adsorption Isotherms
• Freundlich Model: adsorption on
heterogenous surface of adsorbent
qe = KF ∙ Ce
1
n
Or 𝐿𝑜𝑔 𝑞𝑒 = 𝐿𝑜𝑔 𝐾𝑓 +
𝐿𝑜𝑔 𝐶𝑒
𝑛
Where qe= equilibrium adsorption
capacity
Ce=equilibrium concentration
Kf=Freundlich constant: adsorption
capacity
n= Freundlich constant: adsorption
intensity
19

20. Looking at the R2 values, it is clear that the Langmuir model fits the best for this
experiment.
Langmuir Model
R2 b qm
0.9985 1.743 L/mg 2.710 mg/g
Freundlich Model
R2 Kf n
0.891 1.521 mg/g 3.010
20

21. Conclusion/Final Thoughts
• PAN nanofibers  APAN nanofibers Cu(II) Adsorption
Experiments ICP Analysis
• As concentration increases, adsorption curves become less steep,
but adsorption capacity increases
• As more DETA is added, adsorption capacity increases
• Experiment fits the second order kinetic model and Langmuir
adsorption isotherm
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22. Thank you!!  22