period for acid magenta dye removal for both of the adsorbents. Fly ash exhibited
better adsorption capacity in comparison with activated carbon.
2.10 Effect of Adsorbent Dose
The different amount of activated carbon and fly ash (0.5, 1, 1.5, 2, and 2.5 g) was
taken in the experiment to evaluate their adsorption capacity for the acid magenta
dye. The increase in rate of adsorption of acid magenta dye was observed with
increase in the adsorbent amount and exposure time (Fig. 2). The adsorption capacity
of activated carbon and fly ash showed the following trend:
2 g > 1.5 g > 2.5 g > 1 g > 0.5 g. The results of the present study indicated that
fly ash was effective in removal of acid magenta dye from aqueous solution in
comparison with activated carbon. It may be due to increased surface area and
availability of more adsorption sites on the fly ash [23].
2.11 Effect of pH
The percentage of acid magenta dye adsorbed by the activated carbon and fly ash at
different pH is shown in Fig. 3. It was observed that with decrease in the pH of the
acid magenta dye solution, more dye molecules are protonated and get adsorbed on
the surface of fly ash. At pH 2, maximum dye removal 85% and 91% was observed
0
20
40
60
80
100
120
0.5
1
1.5
2
2.5
Dye removal (%)
Adsorbent dose (g)
AC
FA
Fig. 2 Adsorption of acid magenta dye by different adsorbent dose
Removal of Acid Magenta Dye by Fly Ash: A Sustainable Tool for Textile Effluent. . .
267
better adsorption capacity in comparison with activated carbon.
2.10 Effect of Adsorbent Dose
The different amount of activated carbon and fly ash (0.5, 1, 1.5, 2, and 2.5 g) was
taken in the experiment to evaluate their adsorption capacity for the acid magenta
dye. The increase in rate of adsorption of acid magenta dye was observed with
increase in the adsorbent amount and exposure time (Fig. 2). The adsorption capacity
of activated carbon and fly ash showed the following trend:
2 g > 1.5 g > 2.5 g > 1 g > 0.5 g. The results of the present study indicated that
fly ash was effective in removal of acid magenta dye from aqueous solution in
comparison with activated carbon. It may be due to increased surface area and
availability of more adsorption sites on the fly ash [23].
2.11 Effect of pH
The percentage of acid magenta dye adsorbed by the activated carbon and fly ash at
different pH is shown in Fig. 3. It was observed that with decrease in the pH of the
acid magenta dye solution, more dye molecules are protonated and get adsorbed on
the surface of fly ash. At pH 2, maximum dye removal 85% and 91% was observed
0
20
40
60
80
100
120
0.5
1
1.5
2
2.5
Dye removal (%)
Adsorbent dose (g)
AC
FA
Fig. 2 Adsorption of acid magenta dye by different adsorbent dose
Removal of Acid Magenta Dye by Fly Ash: A Sustainable Tool for Textile Effluent. . .
267