Modeling of heavy metal ion adsorption isotherms onto metallophthalocyanine film

Nursel Can, Birsel Can Ömür, Ahmet Altındal*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

Tetrakis [bis(pentafluorophenyl)methoxy]phthalocyaninato zinc(II) (4) coated quartz crystal microbalance (QCM) sensor was developed to detect the heavy metal ions in aqueous solution. The results of the sensor test experiments show that compound 4 is powerful sensing layers capable of working also in the liquid phase to detect heavy metal ions. The equilibrium sorption data were fitted into Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, and Jovanovic isotherms. The rate constants, equilibrium capacities and related correlation coefficients for each isotherm model were calculated and discussed. Regression analysis showed that the Langmuir isotherm model was the most appropriate for fitting the experimental data for Cu2+ ions. The maximum monolayer coverage from Langmuir isotherm model was determined to be 1.64 × 104 mg/g. The obtained values of the separation factor indicating a favourable sorption. On the other hand, it was observed that there is an accessible competition between Freundlich and Langmuir models for the sorption of Co2+ ions onto the sensing layer. Results also show that the linear regression analysis with respect to Jovanovic isotherms generates a straightline that best fit to the data of sorption of Fe2+, Mg2+ and Zn2+ ions.

Original languageEnglish
Pages (from-to)953-961
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume237
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

  • Adsorption isotherms
  • Metal ion sensing
  • Phthlocyanine
  • Sensitivity
  • Seperation factor

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