چكيده به لاتين
In this study, various pollutants and their adverse effects on the environment and living organisms have been studied, and ammonium ions and heavy metals like lead, zinc and cadmium have been selected as destructive contaminants. For this purpose, nano-mordenite was synthesized using colloidal nano silica as a silica Precursor and under hydrothermal conditions. The synthesized adsorbent identification by methods such as BET, X-ray diffraction (XRD), Fourier transform spectroscopy (FT-IR), and scanning electron microscopy (SEM). Methods for removing and reducing pollutants were studied and the effective parameters on the process of adsorption of pollutant ions such as time, pH, adsorbent amount and initial concentration of the solution were studied. The efficiency of reducing the pollutants by adsorbent in a solution of 30 and 10 mg/l was investigated, respectively, from ammonia and heavy metals. Finally, it was determined that the efficiency of adsorbent for ammonia, lead, zinc and cadmium was 99.87, 89.98, 99.71 and 100, respectively. In order to evaluate the results of the absorption process, Langmuir and Freundlich adsorption isotherms were used and correlation coefficients confirmed that adsorption on nano mordenite was more compatible with Langmuir isotherm for heavy metals and with Freundlich isotherm for ammonia. The experimental data were also analyzed using first and second order kinetic models. The second-order equation has a better correlation with absorption data.
Keywords: Heavy metals, Ammonia, Zeolite, Langmuir and Freundlich isotherms
