Adsorption characteristics of Titan yellow and Congo red on CoFe2O4 magnetic nanoparticles

作者：Ghaemi Maryam; Absalan Ghodratollah^*; Sheikhian Leila

来源：Journal of the Iranian Chemical Society, 2014, 11(6): 1759-1766.

DOI：10.1007/s13738-014-0448-0

• Congo red
• Titan yellow
• CoFe2O4 nanoparticles
• Adsorption kinetics
• Langmuir isotherm

This paper assesses the adsorption characteristics of Titan yellow and Congo red on CoFe2O4 magnetic nanoparticles. The adsorption behavior of Titan yellow and Congo red from aqueous solution onto CoFe2O4 magnetic nanoparticles has been determined by investigating the effects of pH, concentration of the dye, amount of adsorbent, contact time, ionic strength and temperature. Experimental results indicated that CoFe2O4 nanoparticles can remove more than 98 % of each dye under optimum operational conditions of a dosage of 15.0 mg CoFe2O4, pH 3.0, initial dye concentration of 22-140 mg L-1, and contact times of 2.0 and 15.0 min for Congo red and Titan yellow, respectively. Langmuir and Freundlich isotherm models have been used to evaluate the ongoing adsorption kinetic equations. Regeneration of the saturated adsorbent was possible by NaCl/acetone solution as eluent. The maximum adsorption capacities were 200.0 and 212.8 mg dye per gram adsorbent for Congo red and Titan yellow, respectively. With the help of adsorption isotherm, thermodynamic parameters such as free energy, enthalpy and entropy have been calculated. On the basis of pseudo-first-order and pseudo-second-order kinetic equations, different kinetic parameters have been obtained.

• 出版日期2014-12