TAILIEUCHUNG - Báo cáo "Reseach on the removal of hexavalent chromium from aqueous solution by iron nanoparticles "

Groundwater remediation by nanoparticles has become a major interest in recent years. This report presents the ability of hexavalent chromium removal in aqueous using iron (Fe0) nanoparticles. Cr(VI) is a major pollution of groundwater and more toxic than Cr(III). Fe0 reduces Cr(VI), transforming Cr(VI) to nontoxic Cr(III). At a dose of iron (Feo) nanoparticles, 100% of Cr(VI) 5mg/l was removed after only 20 minutes. The Cr(VI) removal efficiency increased with decreasing initial pH. | VNU Journal of Science Natural Sciences and Technology 24 2008 233-237 Reseach on the removal of hexavalent chromium from aqueous solution by iron nanoparticles Nguyen Thi Nhung Nguyen Thi Kim Thuong Institute of Geological Sciences Vietnamese Academy of Science and Technology 84 Chua Lang Dong Da Hanoi Vietnam Received 15 August 2007 Abstract. Groundwater remediation by nanoparticles has become a major interest in recent years. This report presents the ability of hexavalent chromium removal in aqueous using iron Fe0 nanoparticles. Cr VI is a major pollution of groundwater and more toxic than Cr III . Fe0 reduces Cr VI transforming Cr VI to nontoxic Cr III . At a dose of l iron Feo nanoparticles 100 of Cr VI 5mg l was removed after only 20 minutes. The Cr VI removal efficiency increased with decreasing initial pH. Synthesized Fe0 nanoparticles were compared iron powder in the same conditions. The results show that Fe0 nanoparticles are more efficient than Fe powder. The final product of the reduction process Cr VI was Cr OH 3. It was concluded that iron nanoparticles are a good choice for the removal of heavy metals in water. 1. Introduction Cr VI is toxic carcinogenic to human and animals. Cr VI is commonly found in water soil and industry waste water. In contrast Cr III is much less toxic and immobile and can be a nutriement for human and animals. So the removal method of Cr VI is to reduce Cr VI to Cr III 1 2 . Many other removal methods for Cr VI in water has been proposed such as physio-chemical adsorption bioremediation chemical reduction 3-5 . However the cost of physio-chemical adsorption method is high and the removal is not complete when bioremediation is not suitable for waste water. Chemical reduction is known to remove Cr VI Corresponding author. Tel. 84-4-8582331. E-mail nguyenthinhung1951@ rapidly and effectively. Many reductants were employed such as H2S. Fe2 Fe0. ect. In this report we use iron nanoparticles Fe0 to reduce Cr VI to Cr

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