10.1186/2193-8865-3-51

Adsorption kinetics, thermodynamic studies, and high performance of CdO cauliflower-like nanostructure on the removal of Congo red from aqueous solution

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  • Azadeh Tadjarodi*1,
  • Mina Imani1,
  • Hamed Kerdari2,
  1. Research Laboratory of Inorganic Materials Synthesis, Department of Chemistry, Iran University of Science and Technology, Tehran, 16846-13114, IR
  2. Department of Chemistry, Saveh Branch, Islamic Azad University, Saveh, 39187-366, IR
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Published in Issue 15-07-2013

How to Cite

Tadjarodi, A., Imani, M., & Kerdari, H. (2013). Adsorption kinetics, thermodynamic studies, and high performance of CdO cauliflower-like nanostructure on the removal of Congo red from aqueous solution. Journal of Nanostructure in Chemistry, 3(1 (December 2013). https://doi.org/10.1186/2193-8865-3-51
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Abstract

Abstract In this work, CdO cauliflower-like nanostructure synthesized by mechanochemical method was employed to evaluate the adsorption ability of Congo red (CR) from the aqueous solution for the first time. UV-visible absorption spectroscopy was used to record the adsorption behavior. This special structure composed of nanorods and tubes with the high contact sites and surface area of 104 m 2 g −1 can be operated as a capable adsorbent to absorb the dye molecules via adsorption process. The adsorption capacity of this material (0.01 g) was studied in high concentrations of CR (50 to 300 mg L −1 ) and represented an excellent efficiency to eliminate this toxic dye. Maximum adsorption capacity ( q max ) calculated using Langmuir isotherm model, at room temperature and neutral pH, was found to be 588.24 mg g −1 . Electrostatic interactions were conceived as the main adsorption mechanism, and the calculated dimensionless separation factor ( R L ), 0.023, indicated a favorable adsorption process. The kinetic and thermodynamic parameters for this proceeding were evaluated and confirmed the high performance of the synthesized adsorbent.

Keywords

  • Nanostructure,
  • Adsorption,
  • Kinetics,
  • Congo red
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