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    Brewers' spent grain in adsorption of aqueous Congo Red and malachite Green dyes: Batch and continuous flow systems.

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    Date
    2019
    Author
    Chanzu, HA
    Onyari, JM
    Shiundu, PM
    Type
    Article
    Language
    en
    Metadata
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    Abstract
    Sorption of Congo Red (CR) and Malachite Green (MG) dyes currently used in pigments and clothing industries were investigated using brewers' spent grain (BSG) from a local brewery. Adsorption increased with a higher adsorbent weight and lower colorant concentrations. Accumulation of CR and MG was optimal at acidic pH and neutral pH respectively. Sorption decreased with an increase in temperature signifying an exothermic process. Batch adsorption data fitted better to Langmuir adsorption isotherm model and pseudo-second-order kinetics. Maximum monolayer coverage capacities (QO)) were found to be 2.55 mg/g for MG and 36.5 mg/g for CR dye. Column studies using BSG were also conducted for both dyes. Fixed bed breakthrough was fast with an increase in dye concentration, adsorbent surface area, and flow rate and with a decrease in column depth. BSG are effective, simple in design and inexpensive adsorbing material from renewable sources.
    URI
    https://www.ncbi.nlm.nih.gov/pubmed/31326840
    http://erepository.uonbi.ac.ke/handle/11295/106687
    Citation
    J Hazard Mater. 2019 Jul 15;380:120897
    Publisher
    University
    Subject
    Adsorption isotherm; Brewers’ spent grain; Congo Red; Kinetics; Malachite Green
    Collections
    • Faculty of Science & Technology (FST) [4284]

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