Original scientific paper

Influence of salt on the decolourisation of Everzol Black B dye solution by adsorption process

Petra Mihovilović orcid.org/0000-0002-0399-1976 ; University of Zagreb Faculty of Textile Technology, Zagreb, Croatia *
Mario Cetina orcid.org/0000-0001-7524-5828 ; University of Zagreb Faculty of Textile Technology, Zagreb, Croatia
Branka Vojnović orcid.org/0000-0003-1900-3036 ; University of Zagreb Faculty of Textile Technology, Zagreb, Croatia
Ana Pešić ; University of Zagreb Faculty of Textile Technology, Zagreb, Croatia
Antonija Ivezić ; University of Zagreb Faculty of Textile Technology, Zagreb, Croatia

* Corresponding author.

Abstract

The textile industry produces considerable amounts of wastewater, which often contain high content of remained dyes from dyeing processes. Of the many decolourisation methods available, the adsorption has proven to be one of the most efficient and cost-effective. Namely, salts present in the wastewater due to its usage as auxiliaries in the dyeing process can increase the efficiency of the adsorption process. The aim of this paper was to investigate the adsorption efficiency of commercially available powdered activated carbon for the removal of the reactive dye Everzol Black B (c0= 500 mg dm-3) in the presence of sodium chloride at the different concentrations (c = 0.1 and 1.0 mol dm-3). Isothermal batch adsorption studies were carried out at 45 (±1) °C with 0.1 g of activated carbon in the periods of 15 minutes to 16 hours when equilibrium was reached, and the results were compared with the adsorption process in a salt absence. Based on the results obtained, we determined that the adsorption process in a presence of sodium chloride results in increase in the decolourisation efficiency. Regardless of salt conecentration adsorption follows the pseudo-second-order kinetic model. Finally, determined thermodynamic parameters confirmed that the presence of sodium chloride leads to more energetically favourable process compared to the one in salt absence, and that higher sodium chloride concentration leads to the more spontaneous adsorption.

Keywords

textile wastewater; Everzol Black B; isothermal adsorption; activated carbon; ionic strength; adsorption kinetics

Hrčak ID:

347536

URI

https://hrcak.srce.hr/347536

Publication date:

10.11.2025.

Article data in other languages: croatian

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