Mahsa souri - Department of chemistry, University of Tehran, Tehran, Iran
Vahid Hoseinpur - Department of chemistry, University of Tehran, Tehran, Iran
Alireza Shakeri - Department of chemistry, University of Tehran, Tehran, Iran
Naser Ghaemi - Department of chemistry, University of Tehran, Tehran, Iran

Introduction: Interests in green chemistry have been increased during the last decades, in order to eliminate ‎or minimize the waste and toxic materials. Green chemistry concerns using nontoxic materials, ‎environmental friendly solvents, and renewable resources. Manganese nanoparticles have been ‎used in wastewater treatment, rechargeable batteries, sensors and etc. [1-3]. In the present ‎approach dH2O as the environmental friendly solvent, Dittrichia graveolens (L.) extracts as the ‎reducing agent, and curcumin, which is extracted from turmeric, as the stabilizing agent were ‎used. Time, ratio of the extracts to the metal and pH were optimized using response surface ‎methodology (RSM) for obtaining the optimal condition.‎Materials and Methods: Plant extracts were prepared by boiling 8g of plant materials in dH2O for 5 minutes. Aqueous ‎solutions of manganese acetate (0.01 M) were prepared in 3 different pH values- 4, 6, and8. 9 ‎runs were designed using Design Expert 10. Different ratio of extracts, and Mn solutions were ‎mixed-10:90, 25:75, and 50:50. The mixtures were stirred for 40, 80 and 120 minutes. Then the ‎extract of turmeric was added to the solutions. MnNPs were characterized by UV-Vis ‎spectroscopy and FESEM.‎Results and Conclusions: Response surface plot indicates that ratio of the extracts to metal is the most effective ‎parameter. Optimum condition was claimed to be as follows: time=56.733, pH=7.242, and ‎‎%Ex=87.906. MnNPs characterized by UV-Vis spectroscopy and their size and morphology were ‎studied by FESEM

Green synthesis, Manganese nanoparticles, Dittrichia Graveolens, Response surface ‎methodology