Nitrate adsorption from Synthetic Aqueous Solutions by Ca(OH)۲ and Clinoptilolite zeolite Nano-particles

In this research article, the authors utilized a ball mill to grind Clinoptilolite zeolite ۹۸% and Ca(OH)۲ nanoparticles, and subsequently characterized the resulting adsorbents using SEM, TEM, XRD, and FTIR analyses. To optimize the adsorption process, they employed the Box-Behnken Design (BBD) of Response Surface Methodology (RSM) to evaluate the impact of various parameters, including pH (ranging from ۵ to ۹), adsorbent amount (ranging from ۰.۵ to ۲ g), and temperature (ranging from ۲۵ to ۴۵ °C). The authors determined that the optimal temperature for nitrate adsorption was ۴۵°C at a pH of ۵, using ۲g of adsorbent. Applying the pseudo-second-order dynamic model for investigation, the optimal retention time was determined to be ۱۵ min. The maximum amounts of nitrate removed by Ca(OH)۲ and zeolite were found to be ۶۰.۳۴% and ۵۸.۰۴%, respectively, with the the absorption equilibrium equation fitting well to the Langmuir model. Under optimal conditions, a mixture of Ca(OH)۲ and zeolite (at a ratio of ۱:۳) removed a maximum of ۵۶.۷۰% of nitrates. These findings demonstrate the significant potential of natural zeolite and Ca(OH)۲ for nitrate adsorption.

کلیدواژه ها:

Adsorption ، Nitrate ، Ca(OH)۲ ، Zeolite ، nano-particles