University of Pretoria
Browse

Effectiveness of adsorbent films for the adsorptive removal of organic dyes, particularly methylene blue (MB) from aqueous solutions

Download (9.5 MB)
dataset
posted on 2025-01-30, 12:30 authored by Lebogang ManamelaLebogang Manamela

This composition results in water-stable adsorbent films, which are recyclable with minimized secondary contamination. Batch adsorption experiments were carried out for the decontamination of MB from aqueous solutions under different conditions including varying pH, contact time, initial MB concentration, and temperature. The adsorbent films achieved adsorption capacities between 2.79 - 4.29 mg/g, with corresponding maximum % removals between 77 - 85 %. The films showed good recyclability, after five adsorption cycles, film 1 maintained 76% of its original adsorption capacity, film 2 maintained 73%, and film 3 67%. The films showed pH-dependent selectivity, demonstrating preferential affinity for anionic methyl orange (MO) at acidic pH and a preference for cationic MB at alkaline pH. The practical applicability of the adsorbent films was assessed in the treatment of real textile industry effluent where the films achieved between 20 - 45 % effluent removal. The economic assessment of the adsorption processes was conducted by considering the cost of chemicals and the energy cost of the adsorption process. These findings suggest that cellulose derivatives and MOFs have the potential to perform synergistically to result in stable, recyclable, versatile, and cost-effective adsorbents for the removal of organic dyes from polluted water.

History

Department/Unit

Chemistry

Sustainable Development Goals

  • 6 Clean Water and Sanitation

Usage metrics

    Natural and Agricultural Sciences

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC