Azo dye decolorization by ZVI under circum-neutral pH conditions and the characterization of ZVI corrosion products

Abuzar Khan, Subbaiah Muthu Prabhu, Jaeseon Park, Woojin Lee, Chul Min Chon, Joo Sung Ahn, Giehyeon Lee

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

This study examined the effects of initial solution pH (pHi), ZVI dosage, initial Trypan Blue (TB) concentration ([TB]0), and background electrolytes (NaCl and NaNO3) on the rate and extent of dye decolorization. TB azo dye ([TB]0 = 90 μM) was almost completely removed in 1320 min at pHi 4, while only 54% at pHi 10. The effects of Cl and NO3 as a common major anion (10 mM) were contrasting on the efficiency of ZVI decolorization. The former accelerated the decolorization presumably due to impeding surface passivation of secondary Fe (oxyhydr)oxides by forming dissolved Fe–Cl complexes. On the contrary, the latter promoted the formation of secondary oxide layers resulting in the declining the ZVI reactivity. The XRD spectra of reacted ZVI particles suggested that lepidocrocite was initially formed as the ZVI corrosion products, which gradually transformed to magnetite. FT-IR spectroscopy revealed the decolorization processes as the destruction of N[dbnd]N bond in TB dye structure, followed by the formation of free aromatic amine groups ([sbnd]NH2) after 1320 min of reaction with ZVI. The experimental results demonstrated that the novel ZVI treatment system could be a potential and promising alternative technique to remove TB dye by reductive decolorization treatment processes.

Original languageEnglish
Pages (from-to)86-93
Number of pages8
JournalJournal of Industrial and Engineering Chemistry
Volume47
DOIs
Publication statusPublished - 2017 Mar 25

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Azo Compounds
Azo dyes
Trypan Blue
Dyes
Corrosion
Oxides
Coloring Agents
Magnetite
Passivation
Infrared spectroscopy
Amines
Negative ions
Electrolytes
Ferrosoferric Oxide
Anions

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Cite this

Khan, Abuzar ; Prabhu, Subbaiah Muthu ; Park, Jaeseon ; Lee, Woojin ; Chon, Chul Min ; Ahn, Joo Sung ; Lee, Giehyeon. / Azo dye decolorization by ZVI under circum-neutral pH conditions and the characterization of ZVI corrosion products. In: Journal of Industrial and Engineering Chemistry. 2017 ; Vol. 47. pp. 86-93.
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Azo dye decolorization by ZVI under circum-neutral pH conditions and the characterization of ZVI corrosion products. / Khan, Abuzar; Prabhu, Subbaiah Muthu; Park, Jaeseon; Lee, Woojin; Chon, Chul Min; Ahn, Joo Sung; Lee, Giehyeon.

In: Journal of Industrial and Engineering Chemistry, Vol. 47, 25.03.2017, p. 86-93.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Azo dye decolorization by ZVI under circum-neutral pH conditions and the characterization of ZVI corrosion products

AU - Khan, Abuzar

AU - Prabhu, Subbaiah Muthu

AU - Park, Jaeseon

AU - Lee, Woojin

AU - Chon, Chul Min

AU - Ahn, Joo Sung

AU - Lee, Giehyeon

PY - 2017/3/25

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N2 - This study examined the effects of initial solution pH (pHi), ZVI dosage, initial Trypan Blue (TB) concentration ([TB]0), and background electrolytes (NaCl and NaNO3) on the rate and extent of dye decolorization. TB azo dye ([TB]0 = 90 μM) was almost completely removed in 1320 min at pHi 4, while only 54% at pHi 10. The effects of Cl− and NO3− as a common major anion (10 mM) were contrasting on the efficiency of ZVI decolorization. The former accelerated the decolorization presumably due to impeding surface passivation of secondary Fe (oxyhydr)oxides by forming dissolved Fe–Cl complexes. On the contrary, the latter promoted the formation of secondary oxide layers resulting in the declining the ZVI reactivity. The XRD spectra of reacted ZVI particles suggested that lepidocrocite was initially formed as the ZVI corrosion products, which gradually transformed to magnetite. FT-IR spectroscopy revealed the decolorization processes as the destruction of N[dbnd]N bond in TB dye structure, followed by the formation of free aromatic amine groups ([sbnd]NH2) after 1320 min of reaction with ZVI. The experimental results demonstrated that the novel ZVI treatment system could be a potential and promising alternative technique to remove TB dye by reductive decolorization treatment processes.

AB - This study examined the effects of initial solution pH (pHi), ZVI dosage, initial Trypan Blue (TB) concentration ([TB]0), and background electrolytes (NaCl and NaNO3) on the rate and extent of dye decolorization. TB azo dye ([TB]0 = 90 μM) was almost completely removed in 1320 min at pHi 4, while only 54% at pHi 10. The effects of Cl− and NO3− as a common major anion (10 mM) were contrasting on the efficiency of ZVI decolorization. The former accelerated the decolorization presumably due to impeding surface passivation of secondary Fe (oxyhydr)oxides by forming dissolved Fe–Cl complexes. On the contrary, the latter promoted the formation of secondary oxide layers resulting in the declining the ZVI reactivity. The XRD spectra of reacted ZVI particles suggested that lepidocrocite was initially formed as the ZVI corrosion products, which gradually transformed to magnetite. FT-IR spectroscopy revealed the decolorization processes as the destruction of N[dbnd]N bond in TB dye structure, followed by the formation of free aromatic amine groups ([sbnd]NH2) after 1320 min of reaction with ZVI. The experimental results demonstrated that the novel ZVI treatment system could be a potential and promising alternative technique to remove TB dye by reductive decolorization treatment processes.

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