Belpatra (Aegel Marmelos) Bark Powder as an Adsorbent for the Color Removal of Textile Dye “Torque Blue”

Adsorption is used as a potential method for the removal of color (dye) from industrial waste water. In this paper an easily available low cost Belpatra (Aegel marmelos) bark powder was used as an adsorbent for the removal of textile dye Torque Blue. For the present work several experiments were conducted at different adsorbent dosage, pH, temperature, dye concentration, particle size, and contact time in a batch adsorption mode. The experimental results revealed that maximum adsorption capacity of Belpatra bark powder on Torque blue dye was found to be 98% at an adsorbent dosage of 0.7gm in 100 ml dye solution having 15mg/L concentration at a temperature 310K and pH 7.5. The equilibrium data was fitted well in Langmuir isotherm model. The values of the Langmuir constants for adsorption capacity (Q⁰) of Torque Blue on the adsorbent were 4.73, 4.13 and 3.74 at temperature 300, 310 and 320K respectively. Kinetic studies showed that adsorption followed first order rate law. Thermodynamic parameters such as standard free energy change (ΔG⁰), enthalpy change (ΔH⁰) and entropy changes (ΔS⁰) were calculated for the interpretation of the adsorption process. The negative values of ΔH⁰ and ΔG⁰ showed that adsorption was exothermic and spontaneous in nature.