Removal of hazardous reactive blue19 dye from aqueous solutions by agricultural waste

Subject Areas : Journal of the Iranian Chemical Research

Nima Razzaghi Asl ¹ (Faculty of Pharmacy, Department of Medicinal Chemistry, Shiraz University of Medical Sciences, Shiraz, Iran)
Mahmood Abassi ² (Faculty of Chemistry, Bu-Ali Sina University, Hamadan, Iran)

Received: 2009-07-25 Accepted : 2009-09-10 Published : 2009-12-31

Keywords: Agricultural waste, Adsorption, Grapefruit Peel, Reactive blue19,

Abstract :

Low-cost grapefruit peel (Agricultural Waste) was used for removal of reactive blue19 dye fromaqueous solutions. The process was studied as a function of contact time, initial dye concentration andpH. Adsorption process was attained to the equilibrium within 45 min for initial dye concentrations of 50,75, and 100 mg L-1. An acidic medium was the optimum condition for adsorption of dye at roomtemperature. The maximum dye removal of 83.56 % could be achieved at initial pH 2 using adsorbentdosage of 0.5 mg in 150 ml (50 mg L-1 dye concentration) and agitation rate of 180 rpm. The adsorptioncapacity was found to be about 12.534 mg g-1. The isotherm data could be well described via Langmuirequation with the correlation coefficient of 0.986 in dye concentration range of 50-100 mg L-1 at 25 ◦C.Kinetic studies revealed that the experimental data correlated well with pseudo second-order modelpossessing regression coefficient of R2 ≥ 0.999. Scanning Electron Micrographs provided a supportingevidence for efficient dye sorption onto grapefruit peel.

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