Recyclable aqueous metal adsorbent: Synthesis and Cu(II) sorption characteristics of ternary nanocomposites of Fe3O4 nanoparticles@graphene–poly-N-phenylglycine nanofibersopen accessRecyclable aqueous metal adsorbent: Synthesis and Cu(II) sorption characteristics of ternary nanocomposites of Fe3O4 nanoparticles@graphene–poly-N-phenylglycine nanofibers
- Other Titles
- Recyclable aqueous metal adsorbent: Synthesis and Cu(II) sorption characteristics of ternary nanocomposites of Fe3O4 nanoparticles@graphene–poly-N-phenylglycine nanofibers
- Authors
- Kim, Hyeong Jin; Choi, Hyuk; Sharma, Abhishek Kumar; Hong, Won G.; Shin, Koo; Song, Hocheol; Kim, Hyun You; Hong, Young Joon
- Issue Date
- Jan-2021
- Publisher
- ELSEVIER
- Keywords
- Adsorbent recycle; Poly-N-phenylglycine; Graphene; Fe3O4 nanoparticles; Aqueous copper adsorption
- Citation
- JOURNAL OF HAZARDOUS MATERIALS, v.401
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HAZARDOUS MATERIALS
- Volume
- 401
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189250
- DOI
- 10.1016/j.jhazmat.2020.123283
- ISSN
- 0304-3894
- Abstract
- Metal pollutant adsorbents are an essential material platform for sustainable environmental remediation, but the adsorbents are typically disposable after sorption, which secondarily contaminates the environment. We report on recyclable Cu(II) adsorbent of deprotonated poly-N-phenylglycine nanofibers (d-PPG NFs)-grafted reduced graphene oxide (rGO) sheets intercalated with Fe3O4 nanoparticles (NPs), which are synthesized via wet chemical process. The adsorption performances of ternary Fe3O4 NPs@rGO d-PPG NFs and binary Fe3O4 NPs@rGO composites are compared, and the ternary ones exhibit much higher Cu2+-adsorption capacity than binary ones under diverse pH conditions due to both high specific surface area and high cationic affinity of d-PPG NFs that follow the Freundlich adsorption model. Density-functional theory calculation results explain why/how the ternary composites show greater Cu2+ adsorption capability in higher pH environment. The ternary composites present stable, high Cu2+ adsorption capability, irrespective of Co-2 concentration in bimetallic Cu and Co aqueous solution. The Fe3O4 NPs in the ternary composites allow magnet-assisted collection after adsorption batches, whose collection yield is 95 % without adsorption capacity degradation in repeated adsorbent reuses
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