초록 |
Poly(amidoamine)s (PAMAM) are effective in removing heavy metal ions from water due to their abundant amine and amide functional groups which have a high binding ability to heavy metal ions. We synthesized poly(amide hydrazide) (PAMH) hydrogel particles that resemble PAMAM polymers in their structure. In Cd2+ and Cu2+ ion sorption tests, the synthesized dihydrazide-based PAMH hydrogel particles exhibited sorption capacity of 85 mg/g for Copper and 47 mg/g for Cadmium. Interestingly, the PAMH showed the improved sorption ability in acidic condition (only 10% less than neutral condition sorption) in contrast to the diamine-based hyperbranched PAMAM that showed ~90% decrease of sorption ability at pH of 4. Also, PAMH hydrogel particles remove trace amount (<1 ppm) of copper and cadmium ions in water. |