Evaluation and comparison of aluminum-coated pumice and zeolite in arsenic removal from water resources

In this research the potential of aluminum-coated pumice and zeolite in arsenic, as (v) removal was investigatedand compared. scanning electron microscopy (sem), x-ray diffraction (xrd) and x-ray flaorescence spectrometry(xrf) were carried out to determine the properties of the adsorbents. several parameters including adsorbentdosage] ph, contact time, and initial as(v) concentration were studied. the optimum ph obtained for bothadsorbents was ph = 7. as(v) adsorption by both adsorbents followed the freundlich isotherm (foraluminum-coated pumice and zeolite respectively with r2 > 0.98 and r2 > 0.99). the obtained data from kineticsshowed that the pseudo-second order model could better explain as(v) adsorption for both aluminum-coatedpumice and zeolite (r2 > 0.98 and r2 > 0.99 respectively). because of low cost, both adsorbents may beeconomically used, but aluminum-coated zeolite showed high efficiency of, due to its porosity and surface area.more than 96% of as(v) with initial concentration of 250 ?g/l was removed by 10 g/l aluminum-coated zeolite atph = 7 and in 60 minutes to achieve as(v) concentration of 10 ?g/l, while only 71% of as(v) could be removed byaluminum-coated pumice.