Comparison of Arsenic Removal from Water by Magnetite and Titanium Oxide Nanoparticles, Ferrosilicon and Ferrosilicon Magnesium

Arsenic metalloid is a toxic contaminant and has a high carcinogenic effect. One of the new and effective methods to reduce the concentration of arsenic in contaminated water is to use mineral amendments. The purpose of this research is to investigate the reduction rate of arsenic in water using magnetite nanoparticles, titanium nanoparticles, ferrosilicon and magnesium ferrosilicon. In this study, the effect of time, initial concentration of arsenic, the amount of adsorbent and pH on variation of arsenic concentrations of solutions were studied by performing batch experiments. The equilibrium time, the optimum amount of adsorbents and the most suitable adsorbent were determined and the adsorption isotherms were plotted. The equilibrium time was two hours for magnetite nanoparticles and titanium nanoparticles, 16 hours for magnesium ferrosilicon, and 24 hours for ferrosilicon. Freundlich isotherm showed greater correlation with test data (R2≥089). With increasing pH, the percentage of arsenic removal decreased and maximum removal (90%) was observed by iron nanoparticles and titanium at pH = 3. Magnetite nanoparticles and titanium oxide nanoparticles were more efficient adsorbent. Ferrosilicon and magnesium ferrosilicon were cheaper adsorbents for removal of arsenic from water.