Adsorption of a textile dye from aqueous solutions by carbon nanotubes

Materials Research

Fernando M. Machado²  Carlos P. Bergmann²  Eder C. Lima¹  Matthew A. Adebayo¹  Solange B. Fagan¹ 

[1] ,Federal University of Rio Grande do Sul Department of Material Porto Alegre RS ,Brazil

关键词: carbon nanotubes;    adsorption;    nonlinear isotherm fitting;    Reactive Blue 4;    isotherm models;   

DOI  :  10.1590/S1516-14392013005000204

来源: SciELO

【 摘 要 】

Multi-walled and single-walled carbon nanotubes were used as adsorbents for the removal of Reactive Blue 4 textile dye from aqueous solutions. The adsorbents were characterised using Raman spectroscopy, N2 adsorption/desorption isotherms and scanning and transmission electron microscopy. The effects of pH, agitation time and temperature on adsorption capacity were studied. In the acidic pH region, the adsorption of the dye was favourable using both adsorbents. The contact time to obtain equilibrium isotherms at 298-323 K was fixed at 4 hours for both adsorbents. For Reactive Blue 4 dye, Liu isotherm model gave the best fit for the equilibrium data. The maximum sorption capacity for adsorption of the dye occurred at 323 K, attaining values of 502.5 and 567.7 mg g-1 for MWCNT and SWCNT, respectively.

【 授权许可】

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