چكيده به لاتين
In this research, first L-cysteine/graphene oxide nanohybrid (SGO) was synthesized by ultrasonic and hydrothermal methods and then silver nanoparticles were loaded on SGO in two different ways using AgNPs without reducing agent (first method) and using AgNO3 in the presence of ascorbic acid (second method). The characterization of hybride nanoparticles was performed using various techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), fourier transform infrared spectroscopy (FT-IR) and X-ray energy scattering (EDAX). The antibacterial properties of the synthesized nano-hybrids and the AgNPs loaded on the nano-hybrids were evaluated against Gram-negative bacteria (Escherichiacoli (E. coli), Klebsiella) and Gram-positive (Staphylococcus aureus (staph), Streptococcus (sterp)), as well as Aspergillus niger. The results showed that the prepared nano-hybrid does not have antibacterial properties against various bacteria, but the loading of AgNPs on the nano-hybrid has improved the antimicrobial performance of nanomaterials. Ag/SGO nanoparticles showed different behavior against gram-positive and gram-negative bacteria. In general, they have better antibacterial properties against gram-negative bacteria. Then, the photooxidation properties of the prepared nanomaterials were examined to degrade methylene blue (MB) as a model of dye contaminant and to detect the extent of degradation using UV/Vis spectroscopy. Experiments showed that the rate of degradation of MB pollutant in visible light condition and in the presence of prepared nano hybride was 90%
