Influence of lead and chromium ions as toxic heavy metals between AFt and AFm phases based on C3A and C4A3S

Tae Ho Ahn, Kwang Bo Shim, Kwang Ho So, Jaesuk Ryou

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Three calcium aluminate (C3A) and calcium sulphoaluminate (C4A3S) as clinker minerals were synthesized to investigate the solidification/stabilization (S/S) mechanism of lead and chromium ions on cement matrix. Effects of AFt phases on S/S mechanism were analyzed using FT-IR, SEM-EDS and heat evolution. Lead and chromium leachability from solidified AFt phases was also investigated using the toxicity characteristic leaching procedure (TCLP) recommended by the U.S. Environmental Protection Agency (EPA). The results showed that clinker mineral types considerably affected the S/S mechanism of AFt and AFm phases incorporating chromium and lead ions. In the case of adding chromium, both AFt and AFm phases based C3A and C4A3S allowed ionic substitution Cr3+for the trivalent ion as Al3+and CrO42-for SO42-.Moreover, chromate hydrocalumite [3CaO • Al2O3• CaCrO4• nH2O] was also observed. However, in the case of adding lead, it was found that when C3A and C4A3S were hydrated, the formation of AFt and AFm phase based C4A3was faster than C3A. Especially, AFt phases and the calcium lead hydroxides (Ca[Pb(OH)3• H2O]2)incorporating lead ions were formed during hydration of C4A3S in the early stage compared to the C3A case. This showed that AFt and AFm phase based C4A3S for S/S of lead were more effective than that of C3A.

Original languageEnglish
Pages (from-to)539-544
Number of pages6
JournalJournal of Ceramic Processing Research
Volume15
Issue number6
StatePublished - 2014 Jan 1

Fingerprint

Poisons
Chromium
Heavy Metals
Heavy metals
Lead
Ions
Solidification
Stabilization
Calcium
Minerals
Chromates
Environmental Protection Agency
Hydration
Leaching
Toxicity
Energy dispersive spectroscopy
Cements
Substitution reactions
Scanning electron microscopy

Keywords

  • AFt phases
  • CA
  • CAS
  • Chromium (III)
  • Lead

Cite this

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title = "Influence of lead and chromium ions as toxic heavy metals between AFt and AFm phases based on C3A and C4A3S",
abstract = "Three calcium aluminate (C3A) and calcium sulphoaluminate (C4A3S) as clinker minerals were synthesized to investigate the solidification/stabilization (S/S) mechanism of lead and chromium ions on cement matrix. Effects of AFt phases on S/S mechanism were analyzed using FT-IR, SEM-EDS and heat evolution. Lead and chromium leachability from solidified AFt phases was also investigated using the toxicity characteristic leaching procedure (TCLP) recommended by the U.S. Environmental Protection Agency (EPA). The results showed that clinker mineral types considerably affected the S/S mechanism of AFt and AFm phases incorporating chromium and lead ions. In the case of adding chromium, both AFt and AFm phases based C3A and C4A3S allowed ionic substitution Cr3+for the trivalent ion as Al3+and CrO42-for SO42-.Moreover, chromate hydrocalumite [3CaO • Al2O3• CaCrO4• nH2O] was also observed. However, in the case of adding lead, it was found that when C3A and C4A3S were hydrated, the formation of AFt and AFm phase based C4A3was faster than C3A. Especially, AFt phases and the calcium lead hydroxides (Ca[Pb(OH)3• H2O]2)incorporating lead ions were formed during hydration of C4A3S in the early stage compared to the C3A case. This showed that AFt and AFm phase based C4A3S for S/S of lead were more effective than that of C3A.",
keywords = "AFt phases, CA, CAS, Chromium (III), Lead",
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Influence of lead and chromium ions as toxic heavy metals between AFt and AFm phases based on C3A and C4A3S. / Ahn, Tae Ho; Shim, Kwang Bo; So, Kwang Ho; Ryou, Jaesuk.

In: Journal of Ceramic Processing Research, Vol. 15, No. 6, 01.01.2014, p. 539-544.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Influence of lead and chromium ions as toxic heavy metals between AFt and AFm phases based on C3A and C4A3S

AU - Ahn, Tae Ho

AU - Shim, Kwang Bo

AU - So, Kwang Ho

AU - Ryou, Jaesuk

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Three calcium aluminate (C3A) and calcium sulphoaluminate (C4A3S) as clinker minerals were synthesized to investigate the solidification/stabilization (S/S) mechanism of lead and chromium ions on cement matrix. Effects of AFt phases on S/S mechanism were analyzed using FT-IR, SEM-EDS and heat evolution. Lead and chromium leachability from solidified AFt phases was also investigated using the toxicity characteristic leaching procedure (TCLP) recommended by the U.S. Environmental Protection Agency (EPA). The results showed that clinker mineral types considerably affected the S/S mechanism of AFt and AFm phases incorporating chromium and lead ions. In the case of adding chromium, both AFt and AFm phases based C3A and C4A3S allowed ionic substitution Cr3+for the trivalent ion as Al3+and CrO42-for SO42-.Moreover, chromate hydrocalumite [3CaO • Al2O3• CaCrO4• nH2O] was also observed. However, in the case of adding lead, it was found that when C3A and C4A3S were hydrated, the formation of AFt and AFm phase based C4A3was faster than C3A. Especially, AFt phases and the calcium lead hydroxides (Ca[Pb(OH)3• H2O]2)incorporating lead ions were formed during hydration of C4A3S in the early stage compared to the C3A case. This showed that AFt and AFm phase based C4A3S for S/S of lead were more effective than that of C3A.

AB - Three calcium aluminate (C3A) and calcium sulphoaluminate (C4A3S) as clinker minerals were synthesized to investigate the solidification/stabilization (S/S) mechanism of lead and chromium ions on cement matrix. Effects of AFt phases on S/S mechanism were analyzed using FT-IR, SEM-EDS and heat evolution. Lead and chromium leachability from solidified AFt phases was also investigated using the toxicity characteristic leaching procedure (TCLP) recommended by the U.S. Environmental Protection Agency (EPA). The results showed that clinker mineral types considerably affected the S/S mechanism of AFt and AFm phases incorporating chromium and lead ions. In the case of adding chromium, both AFt and AFm phases based C3A and C4A3S allowed ionic substitution Cr3+for the trivalent ion as Al3+and CrO42-for SO42-.Moreover, chromate hydrocalumite [3CaO • Al2O3• CaCrO4• nH2O] was also observed. However, in the case of adding lead, it was found that when C3A and C4A3S were hydrated, the formation of AFt and AFm phase based C4A3was faster than C3A. Especially, AFt phases and the calcium lead hydroxides (Ca[Pb(OH)3• H2O]2)incorporating lead ions were formed during hydration of C4A3S in the early stage compared to the C3A case. This showed that AFt and AFm phase based C4A3S for S/S of lead were more effective than that of C3A.

KW - AFt phases

KW - CA

KW - CAS

KW - Chromium (III)

KW - Lead

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M3 - Article

AN - SCOPUS:84920873270

VL - 15

SP - 539

EP - 544

JO - Journal of Ceramic Processing Research

JF - Journal of Ceramic Processing Research

SN - 1229-9162

IS - 6

ER -