Preparation and application of oyster shell supported zero valent nano scale iron for removal of natural organic matter from aqueous solutions

Background: in this research, oyster shell supported zero valent iron nanoparticles were prepared and appliedfor the removal of natural organic matters (noms) from aqueous solutions under different experimentalconditions.methods: the nanoadsorbents prepared by wet impregnation method, then characterized using scanningelectron microscopy, energy dispersive spectroscopy, x-ray fluorescence and bet analysis. adsorption test wasdone in a batch reactor and the effects of different parameters such as initial adsorbate concentration, adsorbentdose, adsorption kinetic, ph, and temperature on removal of noms (humic acid as the indicator) were studied.results: results showed that particle size of nanoadsorbent was in the range of 60-83 nm, and surface area andmicropore volume as 16.85 m2/g and 0.021 m3/g, respectively; the main elements of adsorbent were ca, o, feand na and lime, as high as about 94.25% was the main structural component of the total weight. producednanoadsorbent was not soluble in water. it was also shown that by increasing the nanoadsorbent dose from 0.5to 5 g/100 ml, the removal of humic acid increased from 62.3% to 97.4%. an inverse relationship was foundbetween initial concentration and adsorption capacity, so that a decreasing rate of 33% for humic acid removalwas observed by increasing ph from 5 to 10. temperature increase from 25°c to 40°c, resulted in an increasein humic acid removal from 76.8% to 91.4% and its adsorption on the adsorbent could be better describedby freundlich isotherm (n = 0.016, kf = 0.013 and r2 = 0.74). the most fitted adsorption kinetic model waspseudo-second order model.conclusions: the chemical structure of nanoadsorbent was proper and free from harmful substances. despitethe relative good condition of the effective surface, due to the large size of the shell, the overall microporevolume was low. hence the qualitative characteristics the adsorbent caused the absorption capacity of humicacid to be low (0.96 mg/g).