Article

Adsorption of Congo Red Dye from Aqueous Solutions Using Roots of Eichhornia Crassipes: Kinetic and Equilibrium Studies

Wycliffe Chisutia WanyonyiUniversity of Nairobi, School of Physical Sciences, Department of Chemistry, P.O Box 30197-00100 Nairobi KenyaJohn Mmari OnyariUniversity of Nairobi, School of Physical Sciences, Department of Chemistry, P.O Box 30197-00100 Nairobi KenyaPaul M. ShiunduUniversity of Nairobi, School of Physical Sciences, Department of Chemistry, P.O Box 30197-00100 Nairobi Kenya

2014en

ABI

Abstract

Adsorption of Congo red (CR) from aqueous solution using dried roots of Eichhornia crassipes was studied. Batch experiments were carried out for sorption kinetics and isotherms. Experimental results obtained showed that adsorption process was highly dependent on contact time, adsorbent dosage, initial dye concentration and particle size. The sorption equilibrium for Congo red dye by E. crassipes (roots) was reached within 90 minutes and adsorption efficiency of up to 96% achieved. The sorption kinetics followed a pseudo-second-order kinetic model while Freundlich isotherm model was best applicable for obtaining the equilibrium parameters. These results demonstrate that roots of E. crassipes are effective, environmentally friendly and low-cost biomaterial for dye removal from aqueous dye solutions and industrial effluents.

Identifiers

DOI: 10.1016/j.egypro.2014.06.105

Citations and references

Cited by 20 references

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