The effect of temperature and reductant concentration on the biosynthesis of silver nanoparticles (Ag-NPs) from Jatropha leaf extract (Jatropha curcas L.)

Silver nanoparticles (Ag-NPs) are an interesting study because of their good antibacterial abilities. Various methods have been developed for the synthesis of Ag-NPs, but have problems related to their toxicity and high processing costs. The biosynthetic method (green synthesis) was developed to overcome this problem because it is environmentally friendly. This study used jatropha leaf extract produced using the Soxhlet method. The process parameters of reaction temperature and reductant concentration are the focus of this research on the biosynthesis of silver nanoparticles. The temperature variation used is 27°C,40°C, and 60°C, while the reducing agent concentration is 3.0 ml; 3.6 ml; 4.4 ml; 5.0 ml. Indicators of the formation of Ag-NPs were observed by UV-Vis, PSA, and FTIR. The results showed that the higher the reaction temperature the smaller the particle size formed. In this temperature range, Ag-NPs measuring (15.94 - 24.24) nm can be produced. The reducing parameters show that the lower the concentration, the larger the size of the Ag-NPs produced, ie (8.61 - 24.24) nm. FTIR observations showed that jatropha leaf extract contains reducing flavonoid compounds which are characterized by O-H groups, C-H groups, C=C groups, C-O groups, and C=C groups. From the research that has been done, it can be concluded that the reaction temperature and the concentration of the reducing agent are the parameters that determine the size of the resulting particle.