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The experimental data plotted for the Freundlich isotherm and the Langmuir isotherm are shown in Figures 4 and 5. The constants for both models along with regression coefficients (R2) are summarized in Table 1. The values of correlation coefficient (R2) suggest that both Langmuir and Freundlich isotherms fit the adsorption data adequately. The results suggest that adsorption of As(III) removal on IOISB is a complex mechanism where the controlling step of arsenic adsorption is by both the surface adsorption and intra-particle pore diffusion. Singh & Pant (2004) and Maiti et al. (2007) have also reported that adsorption of As(III) on activated alumina and natural laterite follows both the isotherm models.
Table 1

Adsorption isotherm parameters for As(III) adsorption on IOISB adsorbent

 k (mg/g)Na (mg/g)b (L/mg)R2
Freundlich isotherm 0.363 2.247 – – 0.914 
Langmuir isotherm – – 0.155 46. 44 0.917 
 k (mg/g)Na (mg/g)b (L/mg)R2
Freundlich isotherm 0.363 2.247 – – 0.914 
Langmuir isotherm – – 0.155 46. 44 0.917 
Figure 4

Freundlich isotherm plot for adsorption of As(III) (adsorbent dose 10 mg/L, contact time 90 min, mixing speed 30 rpm).

Figure 4

Freundlich isotherm plot for adsorption of As(III) (adsorbent dose 10 mg/L, contact time 90 min, mixing speed 30 rpm).

Figure 5

Langmuir isotherm plot for adsorption of As(III) (adsorbent dose 10 mg/L, contact time 90 min, mixing speed 30 rpm).

Figure 5

Langmuir isotherm plot for adsorption of As(III) (adsorbent dose 10 mg/L, contact time 90 min, mixing speed 30 rpm).

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