4. Effect of Sorbent Particle Size
The effect of sorbent particle size on biosorption of dyes is shown in Fig. 3. The dyes adsorbed increased as the sorbent particle size decreased. It was suggested that the increase in sorption depended on the large external surface area for small particles; this removes more dye in the initial stages of the sorption process than the large particles. This criteria was considered vital in choosing the ideal particle size as 125-250 mì, furthermore smaller particles than this tend to clog the column during industrial applications.
5. Effect of Adsorbent Dose
The adsorption of the dyes on prawn waste biomass was studied by varying the sorbent concentration (0.1 to 0.4 g in 50 mL). The percentage of adsorption increased as the adsorbent concentration increased shown in Fig. 4. This increase is due to the availability of larger surface area with more active functional groups at higher adsorbent dosages.