Factorial design analysis of As(V) adsorption onto iron-aluminum binary oxide-doped clinoptilolite

Simsek E. B., Ozdemir E., Tuna A. O. A., Beker U.

DESALINATION AND WATER TREATMENT, vol.52, pp.7812-7821, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52
  • Publication Date: 2014
  • Doi Number: 10.1080/19443994.2013.831783
  • Journal Name: DESALINATION AND WATER TREATMENT
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.7812-7821
  • Yıldız Technical University Affiliated: Yes

Abstract

Arsenic adsorption onto an iron-aluminum binary oxide-doped clinoptilolite was studied by using response surface methodology. The Box-Behnken experimental design was used to estimate the effects of major process parameters, namely pH (3-7), temperature (25-65 degrees C), and initial arsenate (As(V)) concentration (0.5-9.5 mg L-1). The experimental data fitted to the empirical second-order model was found to be significant, as was evident from the model F-value of 341.23. The coefficient of determination value of second-order regression model was found to be 0.9977 (R-adj = 0.9948), indicating the accuracy and general availability of the model. The initial arsenic concentration of 9.4 mg L-1, pH of 6.0, and temperature f 62.4 degrees C were found to be optimum for maximum As(V) uptake. The results showed that adsorption capacity increased with increasing temperature, indicating the endothermic nature of the adsorption process.