Structural Memory Effect of Mg-Al and Zn-Al layered Double Hydroxides in the Presence of Different Natural Humic Acids

Process and Mechanism

Zhisheng Gao, Keiko Sasaki, Xinhong Qiu

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The structural memory effect of layered double hydroxides (LDHs) is one of the important reasons for their extensive use in environmental remediation. In this study, humic acid (HA) was extracted from black soil and sediments and characterized to determine their structures. The regeneration mechanisms of calcinated LDHs (CLDHs) including different divalent metals (Mg-CLDH and Zn-CLDH) in deionized water and different HA solutions were carefully elucidated, and the reasons for the behavior differences in the two materials were explained. The presence of the HAs significantly increased the dissolution rate of Mg2+ ions from Mg-CLDHs and subsequent regeneration of Mg-LDH. Because of the diverse functional groups in the HAs, these groups were complexed with metallic ions such as Mg2+ on the surface of Mg-CLDH in the beginning. During the process, the HAs adsorbed the regenerated LDHs on the surfaces. Therefore, the crystallinity, morphology, and specific surface area of the regenerated Mg-LDH significantly changed, especially in the presence of high concentrations of HA. In the case of Zn-CLDH, the regeneration rate of the LDH increased in the presence of HA, but the surface of Zn-CLDH was covered with regenerated Zn-LDH and HA. Then, the inside of the particles could not transform to LDH, leading to poor crystallinity and a significant increase in the ZnO content of the HA system.

Original languageEnglish
Pages (from-to)5386-5395
Number of pages10
JournalLangmuir
Volume34
Issue number19
DOIs
Publication statusPublished - May 15 2018

Fingerprint

Hydroxides
Humic Substances
hydroxides
Data storage equipment
acids
regeneration
crystallinity
Deionized water
Ions
Specific surface area
Functional groups
Sediments
Dissolution
Soils
soils
dissolving
sediments
ions
Metals

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Structural Memory Effect of Mg-Al and Zn-Al layered Double Hydroxides in the Presence of Different Natural Humic Acids : Process and Mechanism. / Gao, Zhisheng; Sasaki, Keiko; Qiu, Xinhong.

In: Langmuir, Vol. 34, No. 19, 15.05.2018, p. 5386-5395.

Research output: Contribution to journalArticle

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