Removal of Zinc from Aqueous Solution by Optimized Oil Palm Empty Fruit Bunches Biochar as Low Cost Adsorbent

Figure 4

(a) Surface plot of adsorption capacity of biochar () as a function of highest treatment temperature (HTT) and heating rate (HR) at fixed residence time of 105 minutes. (b) Surface plot of adsorption capacity of biochar () as a Function of highest treatment temperature (HTT) and residence time (RT) at fixed heating rate of 10°C per minute.

(a)

(b)