Pb²⁺-ion binding by polyacid-based nanoparticles

摘要

Methods are disclosed for preparing novel biodegradable nanoparticles based on complexation of poly-gamma-glutamic acid (γ-PGA) or its cross-linked derivatives with bivalent lead ions. The final products are stable in aqueous media at low pH, neutral and mild alkaline conditions. The size of the complexes depends on the pH, concentrations and the ratios of γ-PGA and lead ions;The γ-PGA nanoparticles made from biodegradable biopolymers with high flocculating and heavy metal binding activity of the present invention may be used for various water treatment applications in aqueous media.

主权项

1. A method of removing heavy metal ions from an aqueous solution comprising adding to an aqueous solution containing heavy ions a sufficient quantity of cross-linked poly-γ-glutamic acid to form a colloid dispersion, wherein said cross-linked poly-γ-glutamic acid is cross-linked with 2.2′-(ethylenedioxy)bis(ethylamine) in water in the presence of water soluble 1-(3-(diethylamino)propyl)-3-ethyl-carbiimide hydrochloride), and filtering the mixture to remove the colloid dispersion.