Fabrication of Adsorbent from Coconut Coir by EDM Method for Removal of Nitrate from Aqueous ‎Solutions

In this work crushed coconut coir was chemically modified by EDM method and its ?performance as adsorbent for removal of nitrate from aqueous solutions was investigated. In this regard, the effect of various parameters like time, adsorbent dosage, nitrate initial concentration, pH, and temperature on the adsorption process was studied. It was ?observed that the kinetic data followed the pseudo-first order kinetic model and the adsorption ?isotherms were properly fitted to Langmuir model. Thermodynamic analysis showed that the ?adsorption process was spontaneous, exothermic with decreased randomness at solid-liquid ?interface. Moreover, the adsorbent showed a superior performance at neutral pH and the adsorbed ?nitrate could easily be desorbed by adjusting pH of the solution suggesting the reusability of the ?adsorbent.?