Adsorption characteristics of jackfruit leaf powder (jlp) for the removal of dyes

Abstract

Adsorption process is one of the superior methods for the dye removal from wastewater; generally the dyes are removed by using synthetic adsorbent such as activated carbon, zeolite and many other adsorbent. But, the synthetic adsorbent is too costly and is not readily available. That’s why we are looking forward for the natural adsorbents. Whose are readily available and the adsorbent does not have any commercial value. In this work we have used JLP (Jackfruit leaf powder) synthesized from mature Jack fruit leaf, having high adsorption capacity for dye and it is relatively cheap. This work presents the experimental studies on the adsorptive removal of Amido Black 10 B dye and Crystal violet dye using a natural adsorbent JLP. Preparation methodology for JLP involved grinding, drying (sun drying), boiling and drying in hot air oven at 105 °C. The synthesized JLP was then used to study the effect of various parameters namely pH, temperature, agitation speed, adsorption time, JLP loading and initial dye concentration on the dye removal efficiency. Then, the optimal process parameters for the dye–JLP system were determined. Each experiment was carried out thrice and the average values were reported to ensure the consistency, repeatability and accuracy of the results. It was observed from the experimental analysis that the dye removal efficiency increases with increasing the adsorbent dosage, adsorption time as well as stirrer speed and the optimal values of JLP dosage, adsorption time and stirrer speed were found to be 10 g/L, 6 h and 275 rpm respectively for Amido black and 10g/L, 4h and 200 rpm respectively for Crystal violet. On the other hand, the dye removal efficiency decreased with increasing the initial dye concentration in the solution as well as temperature, indicating that the adsorption process using JLP is exothermic and is effective for the treatment of solutions with low concentrations of adsorbate. The effect of pH on the dye removal efficiency did not show any regular trend. Maximum dye removal was obtained at low pH values (between 2–4) indicating the fact that the JLP surface is positively charged. During comparison analysis JLP shows the greater removal efficiency than synthetic zeolite. Finally, the data were fitted with various equilibrium and kinetic models and the model parameters were obtained by curve fitting and regression analysis.