Sorption properties of the activated carbon-zeolite composite prepared from coal fly ash for Ni2+, Cu2+, Cd2+ and Pb2+

Vinay Kumar Jha, Motohide Matsuda, Michihiro Miyake

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

Composite materials of activated carbon and zeolite have been prepared successfully by activating coal fly ash (CFA) by fusion with NaOH at 750 °C in N2 followed by hydrothermal treatments under various conditions. Uptake experiments for Ni2+, Cu2+, Cd2+ and Pb2+ were performed with the materials thus obtained from CFA. Of the various composite materials, that were obtained by hydrothermal treatment with NaOH solution (ca. 4 M) at 80 °C (a composite of activated carbon and zeolite X/faujasite) proved to be the most suitable for the uptake of toxic metal ions. The relative selectivity of the present sorbents for the various ions was Pb2+ > Cu2+ > Cd2+ > Ni2+, with equilibrium uptake capacities of 2.65, 1.72, 1.44 and 1.20 mmol/g, respectively. The sorption isotherm was a good fit to the Langmuir isotherm and the sorption is thought to progress mainly by ion exchange with Na+. The overall reaction is pseudo-second order with rate constants of 0.14, 0.17, 0.21 and 0.20 L g/mmol min for the uptake of Pb2+, Cu2+, Cd2+ and Ni2+, respectively.

Original languageEnglish
Pages (from-to)148-153
Number of pages6
JournalJournal of Hazardous Materials
Volume160
Issue number1
DOIs
Publication statusPublished - Dec 15 2008

Fingerprint

Coal Ash
Zeolites
Coal
Fly ash
fly ash
zeolite
Activated carbon
activated carbon
Sorption
Carbon
sorption
coal
Isotherms
Composite materials
isotherm
ion
Poisons
Ions
Sorbents
Metal ions

Keywords

  • Coal fly ash
  • Composite materials
  • Retention of metals
  • Toxic metal ions
  • Zeolite

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Sorption properties of the activated carbon-zeolite composite prepared from coal fly ash for Ni2+, Cu2+, Cd2+ and Pb2+. / Jha, Vinay Kumar; Matsuda, Motohide; Miyake, Michihiro.

In: Journal of Hazardous Materials, Vol. 160, No. 1, 15.12.2008, p. 148-153.

Research output: Contribution to journalArticle

Jha, Vinay Kumar ; Matsuda, Motohide ; Miyake, Michihiro. / Sorption properties of the activated carbon-zeolite composite prepared from coal fly ash for Ni2+, Cu2+, Cd2+ and Pb2+. In: Journal of Hazardous Materials. 2008 ; Vol. 160, No. 1. pp. 148-153.
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