dr. salah el mofty - use of electrophoresis technique to study removal of toxic metal ions from...
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Prof. Dr. Salah Eldin EIMofty Prof. of Mining & Environmental Engineering,
Faculty of Engineering,
Cairo University, Egypt
October/2011
4th Kuwait Waste Management Conference 2011
USE OF ELECTROPHORESIS TECHNIQUE TO STUDY REMOVAL OF TOXIC METAL IONS
FROM WASTE WATER BY ADSORPTION ON MINERAL SURFACE
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Introduction Introduction
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Large quantities of toxic metals and Large quantities of toxic metals and pollutantspollutants
Entering the EnvironmentEntering the Environment
Different Areas of ResearchDifferent Areas of Research
Adsorption on Mineral Surfaces such as ClayAdsorption on Mineral Surfaces such as Clay
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Clay structure
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EXPERIMENTS RESULTS
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MaterialsMaterials The Clay Sample from Alex, Egypt The surface area of Clay was found to be 155m2/g
Compound % by weight
SiO2
Al2O3
MgO L.O.I
55.5 19.4 1.34 11.2
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Electro Kinetic Characterization
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Double-layer showing the surface of clays particles (left side), and the distribution of the adsorbed cations and anions within the double layer (right side).
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Surface Charge Results
The surface charge patterns of Clay mineral particles in the absence and presence of the chloride salts of the heavy metals
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Zeta potential of clay particles in absence and presence of different heavy metal cations
-30-25-20-15-10
-505
101520
0 2 4 6 8 10pH
Zeta
Pot
entia
l mV
pb++ C d++ C o++ K aolin Ni++
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Effect of equilibrium time on adsorption density of M2+ onto Clay. (S/L 50g/L, Ci =10-3 M/L, temperature 200C).
0
0.005
0.01
0.015
0.02
0.025
0 1 2 3 4 5
Equilibrium time(min)
Ad
sorp
tio
n d
eniis
ty
(mg
/m2)
Pb2+ Cd2+Co2+ Ni2+
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The adsorption density at equilibrium qe (g/m2) was calculated according to eq. (1)
(1)(1)
The pseudo first-order and pseudo second-order models were used. The first-order model is generally expressed as follows :
(2)(2)
Integrating eq.(2), at the following boundary conditions, t = 0 and qt =0 to t = t and qe = qt eq. (2) becomes:
(3)(3)
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On the other hand, the second-order equation was used to predict the behavior over the whole range of adsorption. The second-order rate equation is described by:
(4)(4)
Where K2 is the rate constant of pseudo-second-order sorption (g/mg min). Integrating eqn (4) at the boundary conditions t=0 and qt =0 to t = t and qe = qt eq. (4) becomes:
(5)(5)
The constants qe and k2 can be determined using Excel Solver. The values of constants qe and k2 for second-order sorption.
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Kinetic Models Constants For Heavy Metals Adsorption On Clay
Model type
Model constant
s
Heavy metalsPb Cd Co Ni
First order
qe
k1
0.0218.196
0.0118.196
0.00618.196
0.00618.196
Second order
qe
k2
0.0228200
0.0124200
0.008200
0.008200
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Effect of solid to liquid ratio on the adsorption of M2+ onto Clay (Conditioning time of 15 min, Ci = 10-3
M/L, Temperature 20o C, and pH 5-8)
0
5
10
15
20
25
30
35
40
0 0.05 0.1 0.15 0.2 0.25
Solid-Liquid ratio
Ad
sorp
tion
den
sity
1X
10-3
, mg/
m2
Pb2+
Cd2+
Co2+
Ni2+
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Effect of pH on adsorption density of M2+, onto Clay (S/L ratio 50g/L, Ci= 2x10-3 M/L, T=
20oC, and conditioning time 2 h)
0
10
20
30
40
50
60
0 2 4 6 8 10 12
pH
Ad
sorp
tion
den
sity
1X10
-3, m
g/m
2Pb2+
Cd2+
Co2+
Ni2+
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Effect of heavy metal concentration on adsorption density of M2+ onto clay. (S/L ratio 50g/L, T=
20Co, and conditioning time 2 h, and pH 4.8-7.6)
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Schematic of treatment plane for waste water with dissolved heavy metal ions, including adsorption of heavy metal using clay particles.
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Conclusion
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Electrophoresis measurements (Zeta potential) of these studies indicated the adsorption of the hydrolysable metal toxic ions on the Clay surfaces.
The sorption study indicated that the heavy and toxic metals Pb (II), Ni (II), Co (VI) and Cd (II) could be adsorbed and thus removed significantly by Clay from aqueous solutions.
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The batch adsorption tests showed that the removal of metal ion by Clay is a fast process which can reach the equilibrium after 30 seconds.
The adsorption increases with increasing the initial ions concentration and pH. Kinetic modeling showed that the first-order model was appropriate for the description of this type of adsorption.
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The experiment of heavy metal ion uptake by adsorbents showed a marked trend as follows: Pb2+ < Cd2+ <Co2+ ≥ Ni2+.
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شكرا