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Synthesis of CaFeAl layered double hydroxides 2D nanosheets and the adsorption behaviour of chloride in simulated marine concrete
Yang, Lei1,2; Chen, Mingxu1,2; Lu, Zeyu3; Huang, Yongbo1; Wang, Jiaao2; Lu, Lingchao1; Cheng, Xin1
2020-09-18
Source PublicationCEMENT & CONCRETE COMPOSITES
ISSN0958-9465
Volume114Pages:103817
Abstract

Chloride-induced reinforcement corrosion in marine concrete structures adversely impacts its durability, which leads to the decrease of the actual service life of concrete. Three kinds of layered double hydroxides (LDHs), CaFe–NO LDHs (LDHs-CF), CaAl–NO LDHs (LDHs-CA) and CaFeAl–NO LDHs (LDHs-CFA), were synthesized to bind chloride. The results showed that all of the synthetized LDHs could effectively adsorb chloride from simulated concrete pore solutions (SCPSs) and artificial seawater (ASW) through the surface adsorption and ion exchange. The maximum chloride adsorption capacity of the LDHs-CFA was 3.18 mmol g. The adsorption process could be described by the Langmuir isotherm and pseudo-second-order kinetic models. For the chloride desorption experiments, the chloride desorption rate of the LDHs-CF (29.20%) and LDHs-CFA (39.31%) were lower than that of the LDHs-CA (47.45%), because the presence of Fe in LDHs suppressed the concentration of dissolved metals, and a crystal transformation occurred to form 3CaO·FeO·0.5CaSO·0.5CaCl·10HO, exhibiting excellent stability for LDHs-CF and LDHs-CFA. In conclusion, LDHs show excellent chloride binding behaviour, which makes it promising to achieve the goal of high efficiency and stability of chloride binding for marine concrete by LDHs.

KeywordChloride Adsorption Layered Double Hydroxides Artificial Seawater Crystal Transformation
DOI10.1016/j.cemconcomp.2020.103817
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaConstruction & Building Technology ; Materials Science
WOS SubjectConstruction & Building Technology ; Materials Science, Composites
WOS IDWOS:000579761600074
Scopus ID2-s2.0-85091578690
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Citation statistics
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorLu, Lingchao
Affiliation1.Shandong Provincial Key Lab. of Preparation and Measurement of Building Materials, University of Jinan, Jinan, 250022, China
2.School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China
3.oint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, SAR, Macau, China
Recommended Citation
GB/T 7714
Yang, Lei,Chen, Mingxu,Lu, Zeyu,et al. Synthesis of CaFeAl layered double hydroxides 2D nanosheets and the adsorption behaviour of chloride in simulated marine concrete[J]. CEMENT & CONCRETE COMPOSITES, 2020, 114, 103817.
APA Yang, Lei., Chen, Mingxu., Lu, Zeyu., Huang, Yongbo., Wang, Jiaao., Lu, Lingchao., & Cheng, Xin (2020). Synthesis of CaFeAl layered double hydroxides 2D nanosheets and the adsorption behaviour of chloride in simulated marine concrete. CEMENT & CONCRETE COMPOSITES, 114, 103817.
MLA Yang, Lei,et al."Synthesis of CaFeAl layered double hydroxides 2D nanosheets and the adsorption behaviour of chloride in simulated marine concrete".CEMENT & CONCRETE COMPOSITES 114(2020):103817.
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