Simultaneous adsorption of acidic and basic dyes onto magnetized polypeptidylated-hemoglobin composites

Authors: ESSANDOH, MATTHEW - Oak Ridge Institute For Science And Education (ORISE); Garcia, Rafael; Palochik, Victoria; Gayle, Makahra

Submitted to: Separation and Purification Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/2/2020
Publication Date: 9/8/2020
Citation: Essandoh, M., Garcia, R.A., Palochik, V.L., Gayle, M.R. 2020. Simultaneous adsorption of acidic and basic dyes onto magnetized polypeptidylated-hemoglobin composites. Separation and Purification Technology. 255(117701):1-7. https://doi.org/10.1016/j.seppur.2020.117701.
DOI: https://doi.org/10.1016/j.seppur.2020.117701

Interpretive Summary: Blood from chicken slaughterhouses is under-utilized, and it is easy to recover the protein hemoglobin from this blood. In previous studies hemoglobin has been used to make a reusable, magnetic substance that removes dye pollutants from industrial wastewater. This study builds on the previous ones by study the performance of the substance when it is used to treat water polluted with a combination of three chemically diverse dyes. A special technique allowed for measuring the concentrations of the different dyes in a mixture, even though their colors overlap. The findings showed that the presence of different dyes did not compromise the ability of the substance to remove dye, its stability, or its re-usability.

Technical Abstract: Magnetized, polypeptidylated hemoglobin prepared through ring-opening polymerization and chemical co-precipitation was used for simultaneous adsorption of acidic and basic dyes (methyl orange, rhodamine B, and crystal violet) from aqueous solution. Kinetic and isotherm studies were conducted with an adsorbent dose of 2 g/L, a 24 h equilibration time and at room temperature in a ternary system. Multicomponent adsorption of the dyes was found to follow pseudo-second order kinetics while isotherm studies were evaluated using two-parameter models: Langmuir and Freundlich. The Langmuir adsorption capacity was found to be 15.2, 19.7, 14.8 mg/g for methyl orange, rhodamine B and crystal violet, respectively. The adsorbent was found to be stable (iron leachate not detectable) under neutral conditions except under extreme acidic conditions. Further, the dye desorbing regeneration treatment indicated the adsorption capacity was not substantially diminished after multiple cycles.