Response surface modeling of boron adsorption from aqueous solution by vermiculite using different adsorption agents: Box-Behnken experimental design

Pelin Demirçivi*, Gülhayat Nasün Saygili

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this study, a different method was applied for boron removal by using vermiculite as the adsorbent. Vermiculite, which was used in the experiments, was not modified with adsorption agents before boron adsorption using a separate process. Hexadecyltrimethylammonium bromide (HDTMA) and Gallic acid (GA) were used as adsorption agents for vermiculite by maintaining the solid/liquid ratio at 12.5 g/L. HDTMA/GA concentration, contact time, pH, initial boron concentration, inert electrolyte and temperature effects on boron adsorption were analyzed. A three-factor, threelevel Box-Behnken design model combined with response surface method (RSM) was employed to examine and optimize process variables for boron adsorption from aqueous solution by vermiculite using HDTMA and GA. Solution pH (2-12), temperature (25-60 °C) and initial boron concentration (50-8,000 mg/L) were chosen as independent variables and coded x1, x2 and x3 at three levels (-1, 0 and 1). Analysis of variance was used to test the significance of variables and their interactions with 95% confidence limit (α= 0.05). According to the regression coefficients, a second-order empirical equation was evaluated between the adsorption capacity (qi) and the coded variables tested (xi). Optimum values of the variables were also evaluated for maximum boron adsorption by vermiculite-HDTMA (HDTMA-Verm) and vermiculite-GA (GA-Verm).

Original languageEnglish
Pages (from-to)515-530
Number of pages16
JournalWater Science and Technology
Volume76
Issue number3
DOIs
Publication statusPublished - Jul 2017

Bibliographical note

Publisher Copyright:
© 2017 IWA Publishing.

Keywords

  • Adsorption
  • Boron
  • Box-Behnken experimental design
  • Response surface modeling
  • Vermiculite

Fingerprint

Dive into the research topics of 'Response surface modeling of boron adsorption from aqueous solution by vermiculite using different adsorption agents: Box-Behnken experimental design'. Together they form a unique fingerprint.

Cite this