The effect of biosorbent amount on metal ion biosorption is presented in Fig. 6.
For each metal ion,
biosorption onto seashell powder was studied by changing the biosorbent amount from 1.5 to 10 mg at room temperature, while keeping other conditions,
such as pH and contact time, constant.
The increase in biosorbent amount from 1.0 to 2.5 mg led to increases in biosorption capacity,
due to the increased number of binding sites available for each metal ion.
However, increasing in biosorbent amount above 2.5 mg (to a maximum of 10 mg) led to a decrease in biosorption capacity