Environmental Engineering Reference
In-Depth Information
Table 2.2 Rep orted results of batch adsorpt ion studies on the removal of dyes fro m water by CNTs.
Adsorbent
Target dye
Conc.
pH
Temp.
(K)
Contact
time (h)
Adsorption
capacity
Isotherm
Kinetic
model
hermodynamics
Ref.
CNTs
Methylene Blue
5-40 mg L -1
7.0
273
298
333
1.5
35.4 mg g -1
46.2 mg g -1
64.7 mg g -1
Langmuir
Pseudo-
second-
order
Endothermic
[78]
SWCNTs
Acid Red 18
25-100
mg L -1
3.0
298
6
166.66 mg g -1
Langmuir
Pseudo-
second-
order
[79]
SWCNTs
Basic Red 46
50-200
mg L -1
9.0
298
308
318
328
3
38.35 mg g -1
33.12 mg g -1
30.12 mg g -1
27.16 mg g -1
Langmuir
Pseudo-
second-
order
Exothermic
[80]
MWCNTs
Direct Yellow 86
288
308
328
4
35.8 mg g -1
54.9 mg g -1
56.2 mg g -1
Freundlich
Pseudo-
second-
order
Endothermic
[81]
MWCNTs
Direct Red 224
288
308
328
4
47.2 mg g -1
52.1 mg g -1
61.3 mg g -1
Dubinin-
Radushkevich
Pseudo-
second-
order
Endothermic
[81]
MWCNTs
Procion Red
MX-5B
20 mg L -1
6.5
281
291
301
321
24
42.92 mg g -1
44.64 mg g -1
39.84 mg g -1
35.71 mg g -1
Langmuir,
Freundlich
Pseudo-
second-
order
Endothermic
[82]
MWCNTs
Methylene Blue
6.0
298
2
59.7 mg g -1
Langmuir,
Freundlich
Pseudo-
second-
order
[83]
( Continued )
 
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