Main Article Content
The ground tire rubber with the particle size 300-700 micron was modified by treatment by Wij’s reagent, followed by a reaction with Ethylenediamine (EDA) by conventional heating or under microwave irradiation. It was found that EDA modified ground tire rubber from 10 minutes of 300 W microwave reaction performed the best in Nitrate ion (NO3-) adsorption (2.20 mg/g adsorbent). On the other hand, the crumb rubber without modification showed ion exchange capacity only 0.24 mg/g adsorbent. All EDA modified ground tire rubber showed good agreement with Langmuir model and Freundlich model for the isotherm of NO3- adsorption. From Langmuir model, the maximum adsorption capacity of ETD modified ground tire rubber from 10 minutes of 300 W microwave irradiation was 1.97 mg/g, which was higher than 1.04 mg/g of ETD modified ground tire rubber from 30 minutes of conventional heating.