Author/Authors :
Ansari Reza نويسنده , Mosayebzadeh Zahra نويسنده Chemistry Department, Faculty of science, University of Guilan, P.O.Box: 41635-1914,Rasht, Iran , Tavassoli Naser نويسنده Department of Chemistry, School of Science, University of Guilan, Rasht, Iran Tavassoli Naser
Abstract :
Background & Aims of the Study: water pollution by synthetic organic dyes is mainly regarded as environmental and ecological critical issues worldwide. In this research, magnetite iron oxide/silica gel nanocomposite (termed as Fe3O4/SG) was synthesized chemically and then used as an effective adsorbent for removal of sulfur dyes from aqueous solution.
Materials and Methods: The various parameters such as pH, sorbent dosage, initial dye concentration, contact time and dye solution temperature were investigated in a batch system. The equilibrium data were analyzed by Langmuir and Freundlich isotherm models.
Results: The experimental data fit well with pseudo-second-order kinetic model (R2≥0.998) and conformed better to Langmuir isotherm model (R2≥0.997). The maximum adsorption capacity for Fe3O4/SG obtained from the Langmuir model was 11.1mg/g. Evaluation of thermodynamic parameters proved that the adsorption process was normally feasible, spontaneous and exothermic.
Conclusion: It can be concluded that the Fe3O4/SG can be considered as a cost-effective and an environmental friendly adsorbent for efficient removal of sulfur dyes from aqueous solutions.
