tailieunhanh - Green synthesis and utility of nano Fe for Cr(vi) treatment

In this study, we synthesized iron nanoparticles using an environmentally friendly method in order to treat Cr(VI) ions in an aqueous medium. Polyphenols from green tea leaf extracts were used as both the reducing agent and the stabilizer for ZVI nanoparticles. | Vietnam Journal of Agricultural Sciences ISSN 2588-1299 VJAS 2018; 1(1): 35-42 Green Synthesis and Utility of Nano Fe for Cr(VI) Treatment Ngo Thi Thuong, Le Thi Ngoc, and Le Thi Thu Huong Faculty of Environment, Vietnam National University of Agriculture, Hanoi 131000, Vietnam Abstract Zero valent iron (ZVI) nanoparticles have been considered as effective materials for environmental remediation because of their strong reducing ability, high reaction activity, and excellent absorption properties. In this study, we synthesized iron nanoparticles using an environmentally friendly method in order to treat Cr(VI) ions in an aqueous medium. Polyphenols from green tea leaf extracts were used as both the reducing agent and the stabilizer for ZVI nanoparticles. Modern techniques, including scanning electron microscopy (SEM), dynamic light scattering (DLS), X-ray diffraction (XRD), and infrared spectroscopy (FTIR), confirmed that ZVI nanoparticles were successfully prepared and surrounded by polyphenol molecules. Cr(VI) ion treatment of the nanoparticles was most favorable at pH , and g ZVI nanoparticles for a 50 mg L-1 Cr(VI) solution. Under some treatment conditions, removal efficiency was 100%, suggesting that the synthesized ZVI nanoparticles can be used as materials for Cr(VI) ion removal. Keywords Cr(VI) treatment, green synthesis, green tea leaves extract, zero valent iron nanoparticles Introduction Received: September 19, 2017 Accepted: March 9, 2018 Correspondence to lethithuhuong@ ORCID Thi Thu Huong Le Recently, the developement of zero valent iron (ZVI or Fe 0) nanoparticles for treatment of the environment has been highly investigated worldwide. ZVI nanoparticles are used instead of larger iron particles (> 50 µm) because they possess a large specific surface area, have high activity, and possess the ability to transfer to the .