tailieunhanh - Báo cáo "Arsenic removal from water by magnetic Fe1-xCoxFe2O4 and Fe1-yNiyFe2O4 nanoparticles "

This paper studied the effects of Co, Ni replacement in the Fe1-xCoxFe2O4 and Fe1-yNiyFe2O4 (x, y = 0, , , , ) nanoparticles, pH, weight of nanoparticles/ml of water and time of stirring on the arsenic removal ability. The results showed that small amount of g/l of Fe3O4 nanoparticles after stirring time of 3 minutes can reduce the arsenic concentration from mg/l to mg/l. The removal was also affected by the pH of the water. | VNU Journal of Science Mathematics - Physics 25 2009 15-19 Arsenic removal from water by magnetic Fe1-xCoxFe2O4 and Fe1-yNiyFe2O4 nanoparticles Nguyen Hoang Hai Nguyen Dang Phu Center for Materials Science Faculty of Physics College of Science VNU 334 Nguyen Trai Hanoi Vietnam Received 12 March 2009 Absrtact. This paper studied the effects of Co Ni replacement in the and Fe1-yNiyFe2O4 x y 0 nanoparticles pH weight of nanoparticles ml of water and time of stirring on the arsenic removal ability. The results showed that small amount of g l of Fe3O4 nanoparticles after stirring time of 3 minutes can reduce the arsenic concentration from mg l to mg l. The removal was also affected by the pH of the water. Absorption of arsenic by nanoparticles was effective when pH was smaller than 7 and reduced with the increase of pH. At pH of 13 there was a strong release of arsenic ions from arsenic-absorbed nanoparticles back to water. The time of stirring was studied from 1 minute to 2 hours the optimal time was about few minutes. Co and Ni presence was reported to maintain saturation magnetization stable under working conditions. For Co replacement absorption does not change significantly when x and slightly reduces when x . The presence of Ni improved the absorption in most cases. Keywords Magnetic nanoparticles ferrites arsenic removal water treatment. 1. Introduction Arsenic occurs naturally in rocks soil water air plants and animals. It can be further released into the environment through natural activities such as volcanic action erosion of rocks and forest fires or through human actions. Higher levels of arsenic tend to be found more in ground water sources than in surface water sources of drinking water. Arsenic-contaminated water has been a serious problem especially in Vietnam Bangladesh and some areas in the world 1 2 . Human exposure to arsenic can cause both short and long term health effects. Short or acute effects

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