Polymerization of graphene oxide with polystyrene: Non-linear isotherms and kinetics studies of anionic dyes

Autor: H. Ahmad Panahi, Elham Moniri, Mahsasadat Miralinaghi, Avideh Azizi, Amir Hessam Hassani
Rok vydání: 2019
Předmět:
Zdroj: Microchemical Journal. 145:559-565
ISSN: 0026-265X
DOI: 10.1016/j.microc.2018.11.021
Popis: This study describes the preparation of graphene oxide modified with polystyrene (GO-PS) and its application to Reactive Blue 19 (RB 19), Direct Red 81 (DR 81) and Acid Blue 92 (AB 92) adsorption from aqueous media. The adsorbents were characterized by Brunauer-Emmett-Teller (BET) technique, Fourier transform-infrared resonance (FTIR) spectroscopy, Energy-dispersive X-ray (EDX) spectroscopy and scanning electron microscopy (SEM) analysis. The average pore diameter of graphene oxide (GO) increased from 4.853 nm to 7.051 nm after polymerization. Adsorption capacities of GO-PS for dyes removal were evaluated through batch studies. For Reactive Blue 19, Direct Red 81 and Acid Blue 92 dyes (with an initial dye concentration of 20 mg/L), the adsorption capacities of final adsorbent were found to be 13.13, 19.84 and 15.44 mg/g, respectively. The adsorption equilibrium, isotherm and kinetic non-linear models were tested for the adsorption process and the experimental data were best fitted by the Freundlich isotherm with the high correlation coefficient (R2) of 0.999. The maximum adsorption capacities of dyes were achieved 43.280, 40.663 and 39.067 mg/g for Direct Red 81, Acid Blue 92 and Reactive Blue 19, respectively, by using the Langmuir isotherm model. Moreover, the adsorption kinetics of the dyes on GO-PS was well-described by Elovich (for Reactive Blue 19) and intraparticle diffusion models (for Direct Red 81 and Acid Blue 92). The results of this research revealed that GO-PS is a promising adsorbent for removal of anionic dyes in aqueous solution.
Databáze: OpenAIRE
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