Uptake of heavy metal ions in layered double hydroxides and Applications in cementitious materials: Experimental evidence and first-principle study

Bo Li, Shizhe Zhang, Qiu Li, Neng Li, Bo Yuan, HJH Brouwers, Qingliang Yu, Wei Chen

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

The uptake mechanism of heavy metal ions in Layered double hydroxides (LDHs) is investigated in this paper via solid-solution exchange experiments and first principle study. The structures of heavy metal doped LDHs are revealed with XRD, TEM and solid state NMR analysis combined with first principle calculations. The experimental results show that Cu2+ or Cr3+ ions are immobilized in the form of isomorphic substitution during reconstruction of calcined LDHs, forming a non-stoichiometric structure. The Cu2+ or Cr3+ ions are immobilized via isomorphic substitution for Mg2+ and Al3+ in the plate of the layered structure, respectively. The structure of Cu2+ doped LDHs is identified as as [Mg2+ (1-x)(1- z)Cu2+ (1-x)zAl3+ x(OH)2] Anx/ n·yH2O, where z is the Cu2+/Mg2+ molar ratio. The structure of Cr3+ doped LDHs is identified as [Mg2+ 1-x Cr3+ xzAl3+
x(1-z)(OH)2] An- (x+z)/n·yH2O, where z is the Cr3+/Al3+ molar ratio. The Cu2+ or Cr3+ ions from mixing water can be efficiently immobilized with Mg-Al LDHs in cement.
Original languageEnglish
Title of host publication4th International Conference on Service Life Design for Infrastructures
Subtitle of host publication(SLD4) 27-30 August 2018 – Delft, Netherlands
EditorsGuang Ye, Yong Yuan, Claudia Romero Rodriguez, Hongzhi Zhang, Branko Šavija
PublisherRilem
Pages283-297
ISBN (Electronic)978-2-35158-213-8
Publication statusPublished - 2018
Event4th International Conference on Service
Life Design for Infrastructures
- Delft, Netherlands
Duration: 27 Aug 201830 Aug 2018
Conference number: 4

Publication series

NameRilem proceedings
PublisherRilem
NumberPRO 125

Conference

Conference4th International Conference on Service
Life Design for Infrastructures
Abbreviated titleSLD4
CountryNetherlands
CityDelft
Period27/08/1830/08/18

Keywords

  • layered double hydroxides
  • heavy metal ions
  • solid state NMR
  • first principle calculation

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