1.6 Conclusion
17
Table 1.6 Percentage desorption of metal ion from their loaded adsorbent and conditions at which
they were obtained
L Contact
time
(h)
Stirring
speed
(rpm)
pH of
solution
Eluent
(desorbing
agent)
Metal ion-loaded
adsorbent
Percentage
desorption
of metal
ion
References
1 24
150
5
EDTA
Copper-loaded chitosan
membrane
68.74
[130]
1 24
150
5
EDTA
Nickel-loaded chitosan
membrane
45.97
[130]
1 3
120
NM
0.1 M HCl Lead-loaded activated
carbon
60
[45]
1 0.58
NM
NM
0.1 M
H 2 SO 4
Copper-loaded
chemically modified
chitosan
98
[5]
1 2
200
4
Perchloric
acid
(70%)
Mercury-loaded
chitosan-g-polyacrilamide
96.7
[139]
1 2
200
4
Perchloric
acid
(70%)
Lead-loaded
chitosan-g-polyacrilamide
96.7
[139]
1 0.75
NM
7
0.1 M HCl Nickel-loaded natural
zeolite
96
[77]
1 0.75
NM
7
0.1 M
NaOH
Nickel-loaded natural
zeolite
50
[77]
1 0.75
NM
7
Distilled
water
Nickel-loaded natural
zeolite
68
[77]
1 NM
NM
NM
0.01 M
NaoH
Chromium-loaded-coated
chitosan
93
[25]
1 15
NM
4.7
0.002 M
EDTA
Copper-loaded peat
58
[91]
1 15
NM
4.7
0.002 M
EDTA
Nickel-loaded peat
28
[91]
Note: NM means not mentioned
some has recorded its industrial scale use. Thus, it is useful to design a means of
applying these adsorbents a broad scale. In addition, there were no studies on the
handling of regenerated metal ions. This area must be given considerable attention
in other to avoid repolluting the environment.
References
1. W.H. Cheung, J.C.Y. Ng, G. Mckay, Equilibrium studies of the sorption of Cu(II) ions onto
chitosan, J. Colloid Interface Sci. 225, 64–74 (2002)
17
Table 1.6 Percentage desorption of metal ion from their loaded adsorbent and conditions at which
they were obtained
L Contact
time
(h)
Stirring
speed
(rpm)
pH of
solution
Eluent
(desorbing
agent)
Metal ion-loaded
adsorbent
Percentage
desorption
of metal
ion
References
1 24
150
5
EDTA
Copper-loaded chitosan
membrane
68.74
[130]
1 24
150
5
EDTA
Nickel-loaded chitosan
membrane
45.97
[130]
1 3
120
NM
0.1 M HCl Lead-loaded activated
carbon
60
[45]
1 0.58
NM
NM
0.1 M
H 2 SO 4
Copper-loaded
chemically modified
chitosan
98
[5]
1 2
200
4
Perchloric
acid
(70%)
Mercury-loaded
chitosan-g-polyacrilamide
96.7
[139]
1 2
200
4
Perchloric
acid
(70%)
Lead-loaded
chitosan-g-polyacrilamide
96.7
[139]
1 0.75
NM
7
0.1 M HCl Nickel-loaded natural
zeolite
96
[77]
1 0.75
NM
7
0.1 M
NaOH
Nickel-loaded natural
zeolite
50
[77]
1 0.75
NM
7
Distilled
water
Nickel-loaded natural
zeolite
68
[77]
1 NM
NM
NM
0.01 M
NaoH
Chromium-loaded-coated
chitosan
93
[25]
1 15
NM
4.7
0.002 M
EDTA
Copper-loaded peat
58
[91]
1 15
NM
4.7
0.002 M
EDTA
Nickel-loaded peat
28
[91]
Note: NM means not mentioned
some has recorded its industrial scale use. Thus, it is useful to design a means of
applying these adsorbents a broad scale. In addition, there were no studies on the
handling of regenerated metal ions. This area must be given considerable attention
in other to avoid repolluting the environment.
References
1. W.H. Cheung, J.C.Y. Ng, G. Mckay, Equilibrium studies of the sorption of Cu(II) ions onto
chitosan, J. Colloid Interface Sci. 225, 64–74 (2002)