The azo dye and plant-derived sorbent system was investigated in this paper. Direct Orange 26 azo dye was acquired from Boruta-Zachem Kolor Sp. z o.o. Chemically modified granulated corncobs obtained from Chipsi Mais Germany were used as the biosorbent. The changes in the dye and sorbent concentrations with time were measured and used for further calculations. The experiments were carried out in a laboratory fixed bed column. Breakthrough curves were plotted for different initial concentrations, volumetric flow rates and bed heights. Sorption dynamics was described by a model presented in the literature. It was demonstrated that Infrared analysis of the system allows to determine the nature of the dye-sorbent bond. It was found that corncobs can be used as a promising sorbent material.
 Geise GM, Lee HS, Miller DJ, Freeman D, Mcgrath JE, Paul DR. Water purification by membranes: The role of polymer science. J Pol Sci 2010;48:1685-1718. DOI: 10.1002/polb.22037.
 Ahmad AL, Harris WA, Syafiie, Ooi BS. Removal of dye from wastewater of textile industry using membranes. J Tek. 2012:36;31-44. DOI: 10.11113/jt.v36.581.
 Tomczak ET, Kamiński W, Tosik P. Adsorption dynamics studies of azo dyes removal by biosorbent. Desalin Water Treat. 2014;55(10): 2669-2674. DOI: 10.1080/19443994.2014.939490.
 Tomczak ET, Kamiński W, Szczerkowska D. Fractional derivatives for description of sorption kinetics in the plant sorbent-metal ions system. Ecol Chem Eng S. 2013;20(3):499-506. DOI: 10.2478/eces-2013-0037.
 Crini G. Non-conventional low-cost adsorbents for dye removal: A review. Biores Technol. 2006;97:1061-1085. DOI: 10.1016/j.biortech.2005.05.001.
 Vadivelan V, Kumar KV. Equilibrium, kinetics, mechanism, and process design for the sorption of methylene blue onto rice husk. J Colloid Interface Sci. 2005;286:90-100. DOI: 10.1016/j.jcis.2005.01.007.
 Wang Y, Gao BY, Yue WW, Yue QY. Adsorption kinetics of nitrate from aqueous solutions onto modified wheat residua. Colloids Surf A. Physicochem Eng Aspects. 2007;308:1-5. DOI: 10.1016/j.colsurfa.2007.05.014.
 Tan IAW, Ahmad AL, Hameed BH. Adsorption of basic dye on high-surface-area activated carbon prepared from coconut husk: Equilibrium, kinetic and thermodynamic studies. J Hazard Mater. 2008;154:337-346. DOI: 10.1016/j.jhazmat.2007.10.031.
 Sheng PX, Ting YP, Chen JP, Hong L. Sorption of lead, copper, cadmium, zinc, and nickel by Marine algal biomass: characterization of biosorptive capacity and investigation of mechanisms. J Colloid Interf Sci. 2004;275:131-141. DOI: 10.1016/j.jcis.2004.01.036.
 Rajfur M. Algae-heavy metals biosorbent. Ecol Chem Eng S. 2013;20:23-40. DOI: 10.2478/eces-2013-0002.
 Robinson T, Chandran B, Nigam P. Removal of dyes from an artificial textile dye effluent by two agricultural waste residues, corncob and barley husk. Environ Internat. 2002;28:29-33. DOI: 10.1016/S0160-4120(01)00131-3.
 Fonseca-Correa F, Giraldo L, Moreno-Pirajan JC. Trivalent chromium removal from aqueous solution with physically and chemically modified corncob waste. J Analyt Appl Pyrolysis. 2013;101:132-141. DOI: 10.1016/j.jaap.2013.01.019.
 Shen J, Duvnjak Z. Adsorption kinetics of cupric and cadmium ions on corncob particles. Process Biochem. 2005;40:3446-3454. DOI: 10.1016/j.procbio.2005.02.016.
 Leyva-Ramos R, Bernal-Jacome LA, Acosta-Rodriguez I. Adsorption of cadmium(II) from aqueous solution on natural and oxidized corncob. Separation Purif Technol. 2005;45:41-49. DOI: 10.1016/j.seppur.2005.02.005.
 Nasiruddin Khan M, Farooq Wahab M. Characterization of chemically modified corncobs and its application in the removal of metal ions from aqueous solution. J Hazard Mater. 2007;6:237-244. DOI: 10.1016/j.jhazmat.2006.06.119.
 Zhang C, Geng Z, Cai M, Zhang J, Liu X, Xin H, et al. Microstructure regulation of super activated carbon from biomass source corncob with enhanced hydrogen uptake. Internat J Hydrogen En. 2013;38:9243-9250. DOI :10.1016/j.ijhydene.2013.04.163.
 El-Hendawy AA, Samra SE, Girgis BS. Adsorption characteristics of activated carbons obtained from corncobs. Colloids Surf A: Physicochem Eng Aspects. 2001;180:209-221. DOI: 10.1016/S0927-7757(00)00682-8.
 Tseng RL, Tseng SK. Pore structure and adsorption performance of the KOH-activated carbons prepared from corncob. Desalination. 2011;280:1-13. DOI: 10.1016/j.jcis.2005.02.033.
 Sych NV, Trofymenko SI, Poddubnaya OI, Tsyba MM, Sapsay VI, Klymchuk DO, et al. Porous structure and surface chemistry of phosphoric acid activated carbon from corncob. Appl Surf Sci. 2012;261:75-82. DOI: 10.1016/j.apsusc.2012.07.084.
 Yong S, Webley PA. Preparation of activated carbons from corncob with large specific surface area by a variety of chemical activators and their application in gas storage. Chem Eng J. 2010;162:883-892. DOI: 10.1016/j.cej.2010.06.031.
 Aworn A, Thiravetyan P, Nakbanpote W. Preparation of CO2 activated carbon from corncob for monoethylene glycol adsorption. Colloids Surf A: Physicochem Eng Aspects. 2009;333:19-25. DOI: 10.1016/j.colsurfa.2008.09.021.
 Wu FCh, Wu PH, Tseng RL, Juang RS. Preparation of novel activated carbons from H2SO4-pretreated corncob hulls with KOH activation for quick adsorption of dye and 4-chlorophenol. J Environ Manage. 2011;92:708-713. DOI: 10.1016/j.jenvman.2010.10.003.
 Preethi S, Sivasamy A, Sivanesan S, Ramamurthi V, Swaminathan G. Removal of safranian basic dye from aqueos solutions by adsorptions onto corncob activated carbon. Eng Chem Res. 2006;45:7627-7632. DOI: 10.1021/ie0604122.
 Reddad Z, Gerente C, Andres Y, Le Cloirec P. Adsorption of several metal ions onto a low-cost biosorbent: Kinetic and equilibrium studies. Environ Sci Technol. 2002;36:2067-2073. DOI: 10.1021./es0102989.
 Sud D, Mahajan G, Kaur M.P. Agricultural waste material as potential adsorbent for sequestering heavy metal ions from aqueous solutions - A review. Biores Technol. 2008;99:6017-6027. DOI: 10.1016/j.biortech.2007.11.064.
 Tana G, Yuana H, Liub Y, Xiaoa D. Removal of lead from aqueous solution with native and chemically modified corncobs. J Hazard Mater. 2010;174:740-745. DOI: 10.1016/j.jhazmat.2009.09.114.
 Chen JP, Yoon JT, Yiacoumi S. Effects of chemical and physical properties of influence on copper sorption onto activated carbon fixed-bed columns. Carbon. 2003;41:1635-1644. DOI: 10.1016/S0008-6223(03)00117-9.