Batch Studies Removal of RR158 with Time

The removal of RR158 dye from the synthetic solution with respect to time for each solution at different initial values of dye concentration is illustrated in Figs. 4, 5, 6, 7, 8 and 9. It was observed that at low dosages of adsorbent, the dye removal decreased as the initial dye concentration rose. For instance at dosage of 7.5 g/L, the maximum dye uptake of the 40 mg/L dye solution was about 12.00% while that of a 100 mg/L dye solution was 24.00%. As dosage of adsorbent and initial dye concentration increases, the dye uptake also increased. As far as the equilibrium time taken to achieve maximum dye uptake was concerned, it was seen that at low adsorbent dosages, high concentrations of RR158 dye solutions took longer to reach equilibrium while at high dosages (15, 17.5 and 20 g/L), low dye

Graph Dosage
Fig. 5 Graph of percentage removal of dye with respect to time. Conditions: room temperature and 200 rpm, pH: 2 and dosage of adsorbent: 10 g/L
Fig. 6 Graph of removal of dye with respect to time. Conditions: at rtp and 200 rpm, pH: 2 and dosage of adsorbent: 12.5 g/L

concentration solutions (20 and 40 mg/L) had lower equilibrium times. The equilibrium time achieved for varying initial dye concentrations at various dosages of adsorbent determined from the plotted graphs are tabulated in Table 6.

Fig. 7 Graph of removal of dye with respect to time. Conditions: at rtp and 200 rpm, pH: 2 and dosage of adsorbent: 15 g/L
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Fig. 8 Graph of removal of dye with respect to time. Conditions: at room temperature and 200 rpm, pH: 2 and dosage of adsorbent: 17.5 g/L
Biomass Adsorbent
Fig. 9 Graph of percentage removal of dye with respect to time. Conditions: at room temperature and 200 rpm, pH: 2 and dosage of adsorbent: 20 g/L

Table 6 Equilibrium time for the respective batch experiments Dye concentration (mg/L) Equilibrium time, teq (min) Adsorbent dosage

_7.5 (g/L) 10 (g/L) 12.5 (g/L) 15 (g/L) 17.5 (g/L) 20 (g/L)

Table 6 Equilibrium time for the respective batch experiments Dye concentration (mg/L) Equilibrium time, teq (min) Adsorbent dosage

_7.5 (g/L) 10 (g/L) 12.5 (g/L) 15 (g/L) 17.5 (g/L) 20 (g/L)

20

90

40

120

100

100

120

40

80

100

120

120

120

120

60

40

60

60

40

40

100

80

40

40

80

120

40

100

100

40

40

60

120

40

40

120

40

40

60

40

40

40

0 0

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