A novel green synthesis of zero valent iron nanoparticles (NZVI) using three plant extracts and their efficient application for removal of Cr(VI) from aqueous solutions
In the present study, NZVI particles were synthesized from the plant extracts including Rosa damascene (RD), Thymus vulgaris (TV), and Urtica dioica (UD). The FTIR arspectshowed that polyphenols, proteins and organic acids which serve as reducing and stabilizing agents play a significant role in the synthesis of NPs and reduce the possibility of aggregation of NPs compared to chemical techniques of NPs synthesis. The amount and type of compounds in plant extracts affect the structure and also agglomeration of NPs after adsorption process. Based on the results, the highest removal efficiency occurred at pH 2. With increase in contact time and amount of dose, the percentage removal increases. Inversely, increase of initial concentration of Cr(VI) decreases the removal efficiency of the contaminant. These nanoparticles have a high adsorption capacity. Accordingly, by applying a dose of 0.2g/l and contact time of 10min,the three NPs yielded >90% removal efficiency. Also, for 1mincontact time, the percentage removal was 94.87%, 83.48% and86.8% for RD-Fe, UD-Fe and TV-Fe, respectively. By an increase to 25min, the removal percentage reached to 100% for TV-Fe and UD-Fe. Moreover, 30min was required to remove Cr(VI) completely by RD-F.
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