The Fifth International Symposium on Pharmaceuticaland Biomedical Sciences, Nevşehir, Turkey, 26 - 28 April 2019, pp.107-112
Nanoparticles have extremely small dimensions and a high surface area/volume ratio, so they have
chemical and physical differences, such as catalytic reactivity, thermal and electrical conductivity,
chemical stability, optical performance, antimicrobial activity, compared to larger particles of the same
chemical composition. The physical and chemical processes used in the synthesis of nanoparticles
have the disadvantages of producing many toxic substances that pollute the environment because they
require high amounts of temperature and energy. In recent years, in the synthesis of Au, Ag, Pt, Pd,
Zn, Cu metal nanoparticles; biocompatible, non-toxic solvents, high cost-free, synthesized
nanoparticles with good distribution, environmentally friendly biological synthesis methods are
preferred. In this study, copper nanoparticles (CuNPs) were synthesized by the green, fast and
environmentally friendly method using the extract of onion peel which is a waste material.
Onion peel and CuSO4.5H2O were used as a starting material for the synthesis of CuNPs. The color of
the solution changed from the blue color of Cu solution to black revealing the formation of CuNPs.
Formation of CuNPs was easily observed by UV-Visspectroscopy. In addition, the characterization of
CuNPs was performed by SEM images and FTIR analyses.
For CuNPs synthesis, the optimum ratio of onion extract CuSO4.5H2O solution was determined as
70:50. The optimum copper concentration in solution and synthesis temperature were determined as
0.5 M and 20oC, respectively.
In this study, both the environmentally hazardous agricultural and domestic wastes were evaluated, reused, and the onion peel waste was shown to be suitable for the production of CuNPs.