Dye removal by low cost adsorbents: Hazelnut shells in comparison with wood sawdust

• Published in: Journal of hazardous materials Vol. 142; no. 1; pp. 144 - 152
• Main Author: Ferrero, F.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 02.04.2007; Elsevier
• Subjects: Adsorption; Adsorption isotherms; Applied sciences; Chemical engineering; Corylus; Costs and Cost Analysis; Dye adsorption; Exact sciences and technology; Fixed bed; Hazelnut shell; Hydrogen-Ion Concentration; Kinetics; Methylene Blue - isolation & purification; Nuts; Pollution; Wood; Wood sawdust; Wood sawdust; Adsorption isotherms; Hazelnut shell; Fixed bed; Dye adsorption; Second order; Discoloration; Dyes; Wood; Adsorption isotherm; Adsorption capacity; Modeling; Adsorption; Batchwise; Physicochemical purification; Kinetics; Sawdust; Breakthrough curve
• ISSN: 0304-3894; 1873-3336
• DOI: 10.1016/j.jhazmat.2006.07.072

Batch adsorption of Methylene Blue, up to 1000 mg L −1, and Acid Blue 25, up to 500 mg L −1, onto ground hazelnut shells was studied in comparison with sawdust of various species of wood, in order to explore the potential use of this material as low cost adsorbent for dye removal in dyehouse effluents. The adsorption kinetics was investigated according to Lagergren's model, but the best fit was achieved by a second order equation. The equilibrium data were processed according to Langmuir's model and higher adsorption capacity values towards both dyes were shown by hazelnut shells than wood sawdust. Moreover, fixed bed adsorption of Methylene Blue was performed on hazelnut shell columns and the breakthrough curves were determined by varying bed depth, flow rate and influent concentration. The data were processed according to Bohart–Adams model and the column performances could be predicted by the bed depth service time (BDST) approach.