Studies of Isotherm, Kinetics and Thermodynamics of Acid Orange 7 Dye Removal Using Hen Feather and its Carbon

In this research, acid orange7 dye removal is investigated by using hen feather and its carbon as adsorbents. The effect of different parameters such as pH, temperature, initial concentration of dye adsorption dosage and contact time was studied. The results illustrated that the maximum amount of dye removal could be obtained under pH of 3, ambient temperature, dye concentration of 20 mg/L and retention time of 90 min using 30 mg/L of adsorbent. The maximum removal percentages and maximum adsorption capacity were 89.37, 96.41% and 134.23 mg/g, 157.11mg/g, respectively for hen feather and its carbon. The experimental results have been fitted well by the Freundlich isotherm model with R2=0.969 and 0.966 for hen feather and its carbon respectively.Also acid orange7 dye removal follows the pseudo second-order kinetic equation and it's a spontaneous process.