Structure-modulated CaFe-LDHs with superior simultaneous removal of deleterious anions and corrosion protection of steel rebar
- Title
- Structure-modulated CaFe-LDHs with superior simultaneous removal of deleterious anions and corrosion protection of steel rebar
- Author
- 이한승
- Issue Date
- 2021-03
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- RSC ADVANCES, v. 11, NO 18, Page. 10951-10961
- Abstract
- The three anionic species; chloride (Cl ), sulfate (SO4
2 ), and carbonate (CO3
2 ), are typical chemical
factors that environmentally accelerate failure of concrete structures with steel rebar through long-term
exposure. Efficient removal of these deleterious anions at the early stage of penetration is crucial to
enhance the lifespan and durability of concrete structures. Here, we synthesize CaFe-layered double
hydroxide (CaFe-LDHs) by a simple one-step co-precipitation technique and structural modulation by
calcination process. It is applied for the removal of Cl , SO4
2 , and CO3
2 anions as well as corrosion
inhibition on steel rebar in aqueous solutions. The synthesized CaFe-LDHs with phase transfer show
notable improvement of removal capacity (Qmax) toward Cl and SO4
2 over 3.4 times and over 5.69
times, respectably, then those of previous literatures. Furthermore, the steel rebar exposed to an
aqueous solution containing the three anionic sources shows a fast corrosion rate (1876.56 10 3 mm
per year), which can be remarkably inhibited showing 98.83% of corrosion inhibition efficiency when it is
surrounded by those CaFe-LDHs. The novel adsorption mechanisms of these CaFe-LDHs-induced
crystals and corresponding corrosion protection properties are elucidated drawing on synergy of
memory effects and chemical reactions.
- URI
- https://pubs.rsc.org/en/content/articlelanding/2021/ra/d1ra00300chttps://repository.hanyang.ac.kr/handle/20.500.11754/172291
- ISSN
- 20462069
- DOI
- 10.1039/d1ra00300c
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ARCHITECTURE(건축학부) > Articles
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