The effectiveness of natural adsorbent for removal of dye using two isotherm models

Abstract

The low-cost and more efficient adsorbents of Azadirachta Indica (Neem) are charcoal, bark; leave and root were investigated for its optimistic de-colorization of wastewater containing a dye. The effect of various parameters such as contact time, pH, temperature and  adsorbent dosage has been carried out in this study. Two isotherm models were developed for compliance with Langmuir and Freundlich  isotherm. The results of the goodness fit test based on Root Mean Square Error (RMSE), R2 for Langmuir and Freundlich  models were given as, for pH (0.9745 – 0.99919), (0.4831 – 0.9999) for Adsorbent Dose is (0.9034 – 0.9221), (0.4689 – 0.9884) for contact  time (0.9494 – 0.9513), (0.4677 – 0.9990) and temperature (0.9264 – 0.9349), (0.3755 – 0.5849) respectively. Both models were found to be  best fit on decolorization of dye with contact time, pH, temperature and adsorbent dosage. pH 5 value indicated that adsorbent was  effective in the removal of dye.