Thermodynamic study for the adsorption of As(III) onto coconut fiber adsorbent was conducted in the temperature range of 10–50 C keeping initial arsenic concentration of 0.5 mg/L, adsorbent dose of 10 g/L, contact time of 8 h and mixing speed of 80 rpm. Fig. 9 shows that the adsorption capacity increases with increase in temperature. This may be attributed to various reasons such as the enlargement of pore size i.e. change in surface properties of the adsorbent, increase in the number of active surface sites available for adsorption on the coconut fiber adsorbent or the decrease in the thickness of the boundary layer surrounding the adsorbent, so that the mass transfer resistance of adsorbate in the boundary layer decreases [11,21,23,30,31]. As diffusion is an endothermic process, there is a possibility of adsorbent diffusion of solute within the pores at higher temperatures [7]. Maximum removal of As(III) was
96.20% at temperature of 50 C.
Thermodynamic study for the adsorption of As(III) onto coconut fiber adsorbent was conducted in the temperature range of 10–50 C keeping initial arsenic concentration of 0.5 mg/L, adsorbent dose of 10 g/L, contact time of 8 h and mixing speed of 80 rpm. Fig. 9 shows that the adsorption capacity increases with increase in temperature. This may be attributed to various reasons such as the enlargement of pore size i.e. change in surface properties of the adsorbent, increase in the number of active surface sites available for adsorption on the coconut fiber adsorbent or the decrease in the thickness of the boundary layer surrounding the adsorbent, so that the mass transfer resistance of adsorbate in the boundary layer decreases [11,21,23,30,31]. As diffusion is an endothermic process, there is a possibility of adsorbent diffusion of solute within the pores at higher temperatures [7]. Maximum removal of As(III) was96.20% at temperature of 50 C.
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