66
A. Geethakarthi
0.00
2.00
4.00
6.00
8.00
10.00
12.00
0
1
2
3
4
5
6
7
8
9 10 11 12
Initial pH
Final pH
RR31 SC600
RR2 SC600
pH zpc = 9.0
pH zpc = 7.0
Fig. 26 Experimental determination of pHzpc of reactive dyes on SC600
0.00
2.00
4.00
6.00
8.00
10.00
12.00
0
1
2
3
4
5
6
7
8
9 10 11 12
Initial pH
Final pH
RR31 SC300
RR2 SC300
pH zpc = 9.0
pH zpc = 7.0
Fig. 27 Experimental determination of pHzpc of reactive dyes on SC300
who obtained a pH zpc of around 8.7, favouring the uptake of the negative charge of
the reactive dyes.
5.3 Equilibrium Adsorption Isotherms
For any adsorption investigation, one of the most important parameters required
to understand the behaviour of the adsorption process is the adsorption isotherm.
Adsorption isotherm is of fundamental importance in the design of adsorption
systems. The isotherm expresses the relation between the mass of the dye adsorbed
A. Geethakarthi
0.00
2.00
4.00
6.00
8.00
10.00
12.00
0
1
2
3
4
5
6
7
8
9 10 11 12
Initial pH
Final pH
RR31 SC600
RR2 SC600
pH zpc = 9.0
pH zpc = 7.0
Fig. 26 Experimental determination of pHzpc of reactive dyes on SC600
0.00
2.00
4.00
6.00
8.00
10.00
12.00
0
1
2
3
4
5
6
7
8
9 10 11 12
Initial pH
Final pH
RR31 SC300
RR2 SC300
pH zpc = 9.0
pH zpc = 7.0
Fig. 27 Experimental determination of pHzpc of reactive dyes on SC300
who obtained a pH zpc of around 8.7, favouring the uptake of the negative charge of
the reactive dyes.
5.3 Equilibrium Adsorption Isotherms
For any adsorption investigation, one of the most important parameters required
to understand the behaviour of the adsorption process is the adsorption isotherm.
Adsorption isotherm is of fundamental importance in the design of adsorption
systems. The isotherm expresses the relation between the mass of the dye adsorbed