Chemija / Chemistry
 ISSN 0235-7216 ISSN 2424-4538 (online) |
2013 m. Nr. 2 Kinetics of copper(II) and metal complex dye adsorption on activated carbon in the single and binary systems
The kinetics of adsorption of Lanasyn Navy M-DNL (LN) metal complex dye and Cu(II) by granular activated carbon Norit PK 1–3 in single and binary adsorption systems has been investigated. The activated carbon has been characterized by scanning electron microscopy, Boehm titration, and pH drift method. The studies showed that interaction of Norit PK 1–3 activated carbon surface structures with aqueous solution leads to changes in pH of the solution. The initial pH value changed considerably during the experimental period in the single Lanasyn Navy M-DNL dye solution. The presence of copper(II) in the solution leads to the lower change in solution pH when compared to the single dye adsorption system. The experimental data was analyzed using various adsorption kinetic models (pseudo-first-order, pseudo-second-order and intraparticle diffusion). The results show that the pseudo-second-order equation fitted the experimental data well. Also, the diffusion model fitted the experimental data well, indicating that the process of Cu(II) and Lanasyn Navy M-DNL metal complex dye adsorption was diffusion-controlled. Relative adsorption Ar of LN dye and Cu(II) in the adsorption system was calculated. For both pollutants, LN dye and Cu(II) ions, the presence of another compound has a slight positive effect on adsorption kinetics with the exception of the initial period of 5 min for Cu(II).
Keywords: metal complex dye, copper(II), activated carbon, adsorption, kinetics |
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