Coconut copra meal, a waste product of coconut oil production, was investigated as a sorbent for cadmium removal from aqueous solution [144]. The adsorption capacity of copra meal for cadmium ions was calculated to be 4.99 mg/g at 299 K. Adsorption of crystal violet, a basic dye, onto phosphoric and sulfuric acid activated carbons (PAAC and SAAC), prepared from male flowers of coconut tree has been investigated [145]. The adsorption capacities of both the carbons were found to be 60.42 and 85.84 mg/g for PAAC and SAAC, respectively. Besides these, several other researchers investigated the potential of coconut waste as adsorbent for the removal of different pollutants