Abstract
The ability of Fuller's earth to adsorb a basic dye (Astrazone Blue — Basic Blue 69) and an acidic dye (Telon Blue - Acid Blue 25) has been studied. The equilibrium saturation adsorption capacities were 1200 mg dye g−1 Fuller's earth and 220 mg dye g−1 Fuller's earth for Astrazone Blue and Telon Blue, respectively.
The kinetics of the adsorption processes were studied in an agitated batch adsorber. The time to reach 90% equilibrium value was achieved in less than 1 h. The variables investigated were agitation, adsorbent mass, initial dye concentration and temperature.
A limited number of studies were undertaken using a fired clay but significantly lower saturation capacities were obtained, namely, 7 mg dye g−1 fired clay and 40 mg dye g−1 fired clay for Telon Blue and Astrazone Blue, respectively.
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McKay, G., Otterburn, M.S. & Aga, J.A. Fuller's earth and fired clay as adsorbents for dyestuffs. Water, Air, and Soil Pollution 24, 307–322 (1985). https://doi.org/10.1007/BF00161790
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DOI: https://doi.org/10.1007/BF00161790