Telescope snail (Telescopium sp) and mangrove crab (Scylla sp) as adsorbent for the removal of Pb²⁺ from aqueous solutions

The present study was conducted to determine the pontential of telescope snail and mangrove crab shell powder as metal ions Pb²⁺ adsorbent. In addition, evaluate the effectiveness of them for the removal of Pb²⁺ from aqueous solutions. The evaluation include equilibrium adsorption time, adsorption capacity, functional groups, surface structure and substances formation of adsorbents. This study was conducted in laboratory scale using the batch method. Adsorption with variation contact time was performed into Pb²⁺ solutions as synthetic waste water. The results of metal ions Pb²⁺ adsorption in solutions measured by AAS. The analysis results showed both of kind adsorbents reached adsorption equilibrium time on 120 minutes with adsorption capacity 9.93 mg g^-1 for telescope snail shell powder and 9.50 mg g^-1 for mangrove crab shell powder. The results of FTIR analysis showed that functional groups of telescope snail shell powder dominated by carbonates, while the functional groups of mangrove crab shell powder obtained typical compound of chitin and carbonate. Based on the results of this study, telescope snail and mangrove crab shell wastes can be used for the removal of Pb²⁺ from aqueous solutions.