Lysine-cyclodipeptide-based polyamidoamine microparticles: Balance between the efficiency of copper ion removal and degradation in water
SCIE
SCOPUS
- Title
- Lysine-cyclodipeptide-based polyamidoamine microparticles: Balance between the efficiency of copper ion removal and degradation in water
- Authors
- SUNGBIN, JU; Eom; Sang Youl Kim; Sung Yeon Hwang; Dong Soo Hwang; Dongyeop X. Oh; Jeyoung Park
- Date Issued
- 2020-07
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- A key requirement for materials that adsorb pollutants in aqueous media is the balance between efficiency and biodegradation owing to rising microplastic pollution. Hyperbranched polyamidoamine-based microhydrogel particles from ethylene diamine (EDA) monomer demonstrate high absorbance activity for removing heavy metal ions, yet are vulnerable to hydrolysis. Here, we copolymerize lysine diketopiperazine (L-DKP) and EDA with N,N'-methylenebisacrylamide via a Michael addition reaction-mediated inverse suspension polymerization to obtain highly efficient Cu2+-absorbing materials with controlled degradation in aqueous media. When the L-DKP content is increased, which replaces EDA, degradation is typically prevented at the cost of absorption capacity. At optimal L-DKP content (20 mol% per fed diamine monomers), the microparticle exhibits a performance of 159 Cu2+-mg/g, which is comparable to that of the EDA-only microparticles, but with higher degradation resistance, as only 38 wt% was lost at 37 degrees C after two weeks. During the hydrolysis of microparticles without L-DKP, the absorbed Cu2+ ions were released, polluting the aquatic environment. In the presence of L-DKP, Cu2+ ions were significantly retained within the working time. In contrast to synthetic microbeads such as polystyrene, accidently leaked L-DKP-based microparticles decompose within six months. These results provide an industrial, environment-friendly, and long-lasting absorbent for water purification.
- Keywords
- Addition reactions; Amines; Amino acids; Biodegradation; Copper; Efficiency; Ethylene; Heavy metals; Hydrolysis; Metal ions; Monomers; Pollution; Suspensions (fluids); Absorption capacity; Aquatic environments; Controlled degradation; Degradation resistance; Environment friendly; Inverse suspension polymerization; Methylene bisacrylamide; Michael addition reactions; Water treatment
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/103943
- DOI
- 10.1016/j.cej.2019.123493
- ISSN
- 1385-8947
- Article Type
- Article
- Citation
- CHEMICAL ENGINEERING JOURNAL, vol. 391, 2020-07
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- There are no files associated with this item.
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