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

Authors

nima razzaghi asl

faculty of pharmacy, department of medicinal chemistry, shiraz university of medical sciences, shiraz, iran mahmood abassi

faculty of chemistry, bu-ali sina university, hamadan, iran

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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Journal title:
journal of the iranian chemical research

جلد ۲، شماره ۳، صفحات ۲۲۱-۲۳۰

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