Adsorption and desorption cycles of reactive blue BF-5G dye in a bone char fixed-bed column
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In the textile industry, the amount of dye unfixed in fabrics is discarded with wastewaters. Effluents of this nature can be treated efficiently by adsorption on activated bone char, but the reuse of adsorbent is necessary for the technique to be economically feasible. Therefore, the objective of this work was to study the process of desorption of BF-5G blue dye from a bone char fixed-bed column. Solutions of sodium chloride, acetic acid and ethyl alcohol were tested as regenerating agents. Due to the hydrophobicity effect of organic solvent molecules, the highest desorption capacity was observed for ethyl alcohol solution, and the fixed bed was reused after six cycles of adsorption. The other solutions did not promote significant desorption. The results showed that adsorption of the dye involved irreversible interactions between adsorbate molecules and bone char. However, the use of acetic acid solution resulted in the neutralisation of some of the adsorbent surface charges, allowing the fixed bed to operate for a longer time in the second cycle than in the first.
KeywordsAzo dye Ethyl alcohol Sodium chloride Acetic acid Regeneration Textile wastewaters
The study receives financial support from the CAPES.
- Azzaz AA, Jellali S, Akrout H, Assadi AA, Bousselmi L (2018) Dynamic investigations on cationic dye desorption from chemically modified lignocellulosic material using a low-cost eluent: dye recovery and anodic oxidation efficiencies of the desorbed solutions. J Clean Prod 201:28–38CrossRefGoogle Scholar
- Christie R (2001) Colour chemistry, 2nd edn. Springer Verlag, NYGoogle Scholar
- Do DD (1998) Adsorption analysis: equilibria and kinetics. 1st ed. Imperial College Press, LondresGoogle Scholar
- Mccabe WL, Smith JC, Harriot P (2001) Unit operations of chemical Enginnering. 6th ed. McGraw Hill International Ed.Google Scholar
- Regalbuto J, Robles J (2004) The engineering of Pt/carbon catalyst preparation. University of Illinois, ChicagoGoogle Scholar
- Rojas-Mayorga CK, Bonilla-Petriciolet A, Aguayo-Villareal IA, Hernández-Montoya V, Moreno-Virgen MR, Tóvar-Gomez R, Montes-Móran MA (2013) Optimization of pyrolysis conditions and adsorption properties of bone char for fluoride removal from water. J Anal Appl Pyrolysis 104:10–18CrossRefGoogle Scholar
- Thomas WJ, Crittenden B (1998) Adsorption technology and design. 1st ed. Elservier Science & Technology BooksGoogle Scholar
- Thommes M, Kaneko K, Neimark AV, Olivier JP, Rodriguez-Reinoso F, Rouquerol J, Sing KSW (2015) Physisorption of gases, with special reference to the evaluation of surface area and pore size distribution (IUPAC technical report). Pure Appl Chem 87(9–10):1051–1069Google Scholar