Oxidative degradation of quinoline using nanoscale zero-valent iron supported by granular activated Carbon

Vijayalakshmi Gosu, Bhola Ram Gurjar, Tian C Zhang, Rao Y. Surampalli

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The nano zero-valent iron supported granular activated carbon (nFe0/GAC or 2.5%-nFe0/GAC) was synthesized by the liquid chemical reduction method and further used for the oxidative degradation of quinoline. The 2.5%-nFe0/GAC was characterized by various techniques such as Brunauer-Emmett-Teller (BET) surface area, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). It was ascertained that iron is of zero state and well dispersed on GAC. The 2.5%-nFe0/GAC exhibited an H4 type hysteresis loop with a surface area of ∼240 m2/g. The kinetic study reveals that quinoline degradation follows the pseudo-first order. At optimum conditions of pH=4, m=7.5 g/L, Co=100 mg/L, and T=303 K, it was observed that (1) ∼93% of quinoline and ∼63% of total organic carbon (TOC) removal is obtained, (2) iron leaching is within the permissible limit, and (3) it requires ∼63±5 min for completion of the half-life of quinoline. The activation energy is ∼22.4 kJ/mole, which indicates that quinoline removal is controlled by a chemical surface reaction. The degradation by-products of quinoline were analyzed. The mass fragments (of m/z=146 and 178) due to hydroxylation were obtained, which were further reduced into low m/z fragments, which may lead to mineralization of quinoline.

Original languageEnglish (US)
JournalJournal of Environmental Engineering (United States)
Volume142
Issue number1
DOIs
StatePublished - Jan 1 2016

Fingerprint

Activated carbon
activated carbon
Iron
Degradation
degradation
surface area
iron
Hydroxylation
Surface reactions
Hysteresis loops
Organic carbon
hysteresis
FTIR spectroscopy
Field emission
activation energy
half life
Leaching
total organic carbon
Fourier transform infrared spectroscopy
Byproducts

Keywords

  • 2.5 % - nFe 0 / GAC
  • Kinetics
  • Oxidative degradation
  • Quinoline
  • Zero-valent iron

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Civil and Structural Engineering
  • Environmental Science(all)

Cite this

Oxidative degradation of quinoline using nanoscale zero-valent iron supported by granular activated Carbon. / Gosu, Vijayalakshmi; Gurjar, Bhola Ram; Zhang, Tian C; Surampalli, Rao Y.

In: Journal of Environmental Engineering (United States), Vol. 142, No. 1, 01.01.2016.

Research output: Contribution to journalArticle

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abstract = "The nano zero-valent iron supported granular activated carbon (nFe0/GAC or 2.5{\%}-nFe0/GAC) was synthesized by the liquid chemical reduction method and further used for the oxidative degradation of quinoline. The 2.5{\%}-nFe0/GAC was characterized by various techniques such as Brunauer-Emmett-Teller (BET) surface area, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). It was ascertained that iron is of zero state and well dispersed on GAC. The 2.5{\%}-nFe0/GAC exhibited an H4 type hysteresis loop with a surface area of ∼240 m2/g. The kinetic study reveals that quinoline degradation follows the pseudo-first order. At optimum conditions of pH=4, m=7.5 g/L, Co=100 mg/L, and T=303 K, it was observed that (1) ∼93{\%} of quinoline and ∼63{\%} of total organic carbon (TOC) removal is obtained, (2) iron leaching is within the permissible limit, and (3) it requires ∼63±5 min for completion of the half-life of quinoline. The activation energy is ∼22.4 kJ/mole, which indicates that quinoline removal is controlled by a chemical surface reaction. The degradation by-products of quinoline were analyzed. The mass fragments (of m/z=146 and 178) due to hydroxylation were obtained, which were further reduced into low m/z fragments, which may lead to mineralization of quinoline.",
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