Comparative Study of Cadmium Biosorption by Eucheuma cottonii Marine Algae and Carrageenan

摘要

Cadmium adsorption capacity by Eucheuma cottonii and carrageenan was investigated. 64.3 % carrageenan was successfully extracted from E. cottoniiby weakly alkaline solution (pH 8.5) at 95 °C for 18 h. FTIR spectra of the extracted carrageenan showed the same spectra as the pure carrageenan. Batch experiment was conducted to determine the cadmium biosorption capacitiesof E. cottonii and carrageenan. Cadmium concentration was measured by atomic absorption spectrophotometry. Biosorption capacity of cadmium was 0.95, 3.85 and 3.87 mg/g for E. cottonii, extracted carrageenan and pure carrageenan, respectively.