An investigation of the kinetics and thermodynamics of the adsorption of a cationic cobalt porphyrazine onto sepiolite

Altuǧ Mert Sevim, Rustam Hojiyev, Ahmet Gül*, Mehmet Sabri Çelik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

The adsorption of [octakis(2-trimethylammoniumethylsulfanyl)- porphyrazinatocobalt]octaiodide from aqueous solution onto negatively charged sepiolite is investigated. The effects of temperature, dye and solid concentration and contact time on adsorption were evaluated. Adsorption experiments were analyzed in the light of zeta potential measurements and desorption behavior of the dye-sepiolite composite. Experimental data were analyzed using four adsorption kinetic models, of which a pseudo-second-order kinetic model was found to be superior. Experimental equilibrium data were fitted to five adsorption isotherm models, from which the free energy, enthalpy and entropy of the adsorption processes were determined. Adsorption onto sepiolite was exothermic and spontaneous. AAS and FTIR were used to elucidate the adsorption mechanism. The novel composite is considered to be useful in optical and catalytic applications.

Original languageEnglish
Pages (from-to)25-38
Number of pages14
JournalDyes and Pigments
Volume88
Issue number1
DOIs
Publication statusPublished - Jan 2011

Funding

This work was supported by the Research Fund of the Technical University of Istanbul.

FundersFunder number
Technical University of Istanbul

    Keywords

    • Adsorption
    • Cationic dye
    • Kinetics
    • Porphyrazine
    • Sepiolite
    • Thermodynamics

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