Synthesis of Adsorbent from Surf Clam Shell for Humidity Adsorption in Shrimp Cracker Product

This research aimed to synthesize adsorbent from a surf clam shell. A surf clam shell was washed with water, dried, and ground until powder. After that, a surf clam shell powder at 10 g was heated at 1100˚C. The crystal structure of a surf clam shell powder before and after heating was characterized by X-ray diffraction (XRD). The XRD results showed that the initial crystal structure of a surf clam shell powder was calcium carbonate. After heating at 1100˚C, the calcium carbonate phase of the surf clam shell completely changes to the calcium oxide phase. The calcium oxide from the surf clam shell was used as an adsorbent in the shrimp cracker product at 25 g. 10 g of calcium oxide was contained in the porous bag amount of 4 bags for the humidity absorption test at 0, 10, 30, and 60 days. The humidity efficiency of the adsorbent from the surf clam shell was monitored through the phase transformation of calcium oxide. Moreover, the shrimp cracker product investigated the water activity and crispness. The result showed that the adsorbent of calcium oxide was changed to calcium hydroxide partially after the humidity absorption test at 10 days. Moreover, the water activity result of the shrimp cracker product was slightly increased from 0 to 60 days. While the crispness of the shrimp cracker product was slightly decreased. From the experiment indicated the adsorbent can be synthesized from the surf clam shell and used as humidity adsorption in the shrimp cracker product.