چكيده به لاتين
Due to increasing water consumption in all areas such as drinking, agriculture, industry, ect; water health is important. One of the contamination of water is pathogens such as bacteria. In this study, removal of E.coli as a gram-negative bacteria and Staphylococcus aureus as a gram-positive bacteria were examined by using clinoptilolite /ZnO /TiO2 nanocomposite with different ratios of TiO2/ZnO 1:1, 1:2 and 2:1 under UVA and UVC light irradiation. After nanocomposite synthesis, characterization tests including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray energy diffraction (EDX), fourier-transform inferared spectroscopy (FT-IR), diffuse reflection spectroscopy (DRS) and nitrogen adsorption-desorption (BET) were performed to confirm the structure. Response surface methodology (RSM) was used by Design Expert 12 software to optimize the experiments. UVA light is recommended because it provides higher contact times, less energy consumption and is more cost-effective than UVC light. Therefore, as the goal is to reduce the bacterial content of water to zero, according to the prediction of software, we will see 100% removal of bacteria in a ratio of 1:1 TiO2/ZnO for E. coli at concentrations of 6.5 mg/ml in 100 minutes under UVA light and for Staphylococcus aureus in the concentration range 15.5 to 18.5 mg / ml from 50 minutes onwards under UVA light.
