Alginate is a versatile polymer possessing gelling properties which facilitate many applications, such as bioremediation. To facilitate efficient bioremediation, guidance is needed on the reactivity and coordination of the alginate-metal binding process. This study presents a novel approach utilizing Isothermal Titration Calorimetry (ITC) to elucidate the interaction between Pb2+, Cu2+, and Cd2+ ions; and alginates of various monomeric compositions. A 2-step binding process was observed during gelation. Pb2+ and Cu2+ binding parameters increased, while Cd2+ decreased, with decreasing M:G ratios. Two distinct binding sites were observed, with the first driving the reaction at low temperatures. This was supported with experimental results showing high removal rates for Pb2+ and Cu2+ of 85 and 65% respectively at low M:G ratios and low molecular weight and 75% for Cd2+ at high M:G ratios. Thus, alginate monomeric composition plays an integral role in the binding process and should be considered for efficient bioremediation.

On the binding affinity and thermodynamics of sodium alginate-heavy metal ion interactions for efficient bioremediation

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.