D. R. Manimaran1*, G.
Sarojini2 and? P. Ramalingam1
Biotechnology, Kumaraguru College of Technology, Coimbatore-641 049, India
Petrochemical Engineering, SVS College of Engineering, Coimbatore-642 109,
Author Email :
Aim: The effect of pH,
adsorbent concentration, time, initial dye concentration and agitation speed
on adsorption capacity of papaya latex as an adsorbent was investigated.
Methodology: The biosorption
experiments were carried out in batch process by means of conical flask and
agitated in a thermostated shaking incubator at rpm for a suitable contact
time at different temperature range. The experiments were carried out at
different pH (4-9), fixed biosorbent dosage, temperature, contact time,
initial dye concentration and agitation speed. The samples were withdrawn at
regular intervals and the concentration of dyes were analyzed using a UV-
Results: The adsorption studies
revealed that papaya latex removed about 83.18% of the reactive red dye and
87.97% of deep marine blue dye from aqueous phase under optimal conditions.
The maximum adsorption of both dyes was found at pH 4. Adsorption isotherms
such as Langmuir, Freundlich, Temkin and Dubin models were attempted to
predict equilibrium data. The pseudo-first-order kinetics provide the best
correlation of experimental data.
Interpretation: Waste papaya
latex can be used as an eco-friendly and low-cost adsorbent in removal of
reactive red dye and deep marine blue from textile effluent.
Key words: Deep marine blue dye, Kinetics, Isotherm, Papaya latex,
Reactive red dye