APPLICATION OF CORAL SUPPORTED IRON ZERO VALENT NANO SCALE FOR REMOVAL OF NATURAL ORGANIC MATTER FROM AQUEOUS SOLUTIONS

摘要

Background: Different materials such as mesoporous silica, carbon and titanium dioxide, chitosan beads, ceramic membranes, kaolin and betonies have been used as a base for nanoparticles in water treatment industry. In this Research coral supported zero valent iron nanoparticles was applied for the removal natural organic matter from aqueous solutions under different experimental conditions.Methods: Nanoadsorbent was prepared by wet impregnation method, then characterized using SEM, X-Ray Fluorescence and BET analysis. Adsorption test was done in a batch reactor and effect of different parameters such as initial adsorbate concentration, adsorbent dose effect, adsorption kinetic, and pH, on adsorption of NOMs were studied.Results: results show that particle size of nanoadsorbent is in range of 53-94 nm, surface area and micropore volume are 16.85 m~2/g and 0.023 m~3/g respectively, also the most components of adsorbents is composed of lime. Produced nanoadsorbent did not solubility in water. By increasing the nanoadsorbent dose, the removal of humic acid increased, an inverse relationship was found between initial concentration and adsorption capacity. The most fitted adsorption isotherm and kinetic model were Freundlich isotherm and pseudo-second order model respectively.Conclusions: chemical structure of nanoadsorbent was properly and free of harmful substances. Despite the relatively good condition of the effective surface, due to the large size of the crushed coral, the overall micro pore volume was low. This led to the absorption capacity of humic acid is low.