عنوان مقاله [English]
The purpose of this study was to remove nitrate ion using nano clay montmorillonites whose surface was modified using the octa decy lamine functional group. In this study, nano clay was first modified using octa decyl amine and the surface properties of this nanoparticle modified by scanning electron microscopy (SEM) and X-ray diffraction spectrum (XRD) were investigated. In the next step, the nitrate ion adsorption process was investigated by using adsorption model and by examining the parameters of contact time between adsorbent and adsorbent, absorbent concentration, pH effect and effect of adsorbent dose on nitrate removal. Absorption rate was evaluated by atomic absorption. The results showed that the correction of the nanoclay surface by the amine group increased the interlayer spacing from 7.58 Angstrom to 22.91 Angstrom and the size of the modified nanoparticles was about 80 to 100 nanometers. By increasing the nano absorbing surface, the number of sites active absorption has increased. In the study of adsorption of nitrate ions, the maximum adsorption at pH was 5, the initial concentration of 100 mg/l, the contact time of 40 min, and the 0.7 g of nano-adsorbent. In the study of equilibrium isotherms, it was found that the adsorption process follows Langmuir and Freundlich isotherms and the highest single-layer adsorption capacity was 18.352 mg/g. The kinetics of the above process is consistent with the second-order kinetic model and the amount of absorbance per unit mass of the adsorbent in equilibrium is 2.518 mg/g.
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