Synergistic removal of Cu(II) and nitrazine yellow dye using an eco-friendly chitosan-montmorillonite hydrogel: Optimization by response surface methodology


Ngwabebhoh F. A., Erdem A., Yıldız U.

JOURNAL OF APPLIED POLYMER SCIENCE, vol.133, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 133
  • Publication Date: 2016
  • Doi Number: 10.1002/app.43664
  • Journal Name: JOURNAL OF APPLIED POLYMER SCIENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: adsorption, hydrogels, modelling, response surface methodology, swelling, HEAVY-METAL IONS, LEAD II IONS, AQUEOUS-SOLUTION, ADSORPTION, EQUILIBRIUM, COMPOSITE, CADMIUM, BEADS, CLAY, ADSORBENTS
  • Kocaeli University Affiliated: Yes

Abstract

A comprehensive feasibility study on adsorption of Cu(II) and a water-soluble nitrazine yellow (NY) dye by chitosan-montmorillonite (CS-MMT) hydrogel as the biosorbent was investigated as a function of biosorbent dosage, initial concentration, pH, temperature, and the presence of salts. Box-Behnken methodology was applied to optimize the adsorption experiments. Maximum adsorption values were determined as 132.74 mg/g and 144.41 mg/g at pH=5.0, for Cu(II) and NY dye, respectively. Equilibrium isotherms of Langmuir and Freundlich were analyzed by the non-linear regression model. The equilibrium data were well described by Freundlich model and the adsorption process well fitted pseudo-second order kinetics. The enthalpy change of adsorption (H degrees) were calculated as -3.78 kJ/mol and -5.75 kJ/mol for Cu(II) and NY dye, respectively, indicating that the adsorption processes were exothermic. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43664.