Kinetics and thermodynamics of adsorption for Cd on green manufactured nano-particles

Yao Jen Tu, Chen-Feng You, Chien Kuei Chang

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

Magnetic nano-particles CuFe2O4 were successful manufactured from industrial sludge by combination of acid leaching, chemical exchange, and ferrite process. For the first time these recycled nano-particles were used as adsorbent to investigate the kinetics and thermodynamics for adsorption of Cd in aqueous solutions. These experimental results showed that Cd2+ adsorption efficiency increased from 0.85 to 99.9% when pH increased from 2 to 6. The maximum adsorption capacity of Cd2+ was found to be 17.54mgg-1 under the conditions at pH 6.0, contact time 30min, and temperature 318K. The pseudo-second-order kinetic model provides the best correlation with the experimental data compared to the pseudo-first-order model. The Langmuir model yields a better fitting than the Freundlich model for Cd2+ adsorption on CuFe2O4 nano-particles under investigated temperatures. The thermodynamic constants of the adsorption process were evaluated, ΔG°, ΔH° and ΔS° is -6.05kJmol-1 (at 318K), 0.71kJmol-1, and 4.53Jmol-1K-1, respectively. These results imply that Cd2+ adsorption onto CuFe2O4 is feasible, spontaneous and endothermic in nature.

Original languageEnglish
Pages (from-to)116-122
Number of pages7
JournalJournal of Hazardous Materials
Volume235-236
DOIs
Publication statusPublished - 2012 Oct 15

All Science Journal Classification (ASJC) codes

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

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