Health and environment
Mahboube Eskandari; Nasser Goudarzi; Mansour Arab chamjangali; Seyyed Gholamreza Moussavi
Volume 27, Issue 2 , July and August 2020, , Pages 131-141
Abstract
ABSTRACTBackground: The photocatalytic process has been used for many years in industrialized countries as a solution to the world's environmental pollution. During the oxidative photo-catalytic processes, the pollutants are completely degraded by UV irradiation in the presence of semi-conductor catalysts, ...
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ABSTRACTBackground: The photocatalytic process has been used for many years in industrialized countries as a solution to the world's environmental pollution. During the oxidative photo-catalytic processes, the pollutants are completely degraded by UV irradiation in the presence of semi-conductor catalysts, and are converted to CO2 and H2O. In this work, for the first time, the use of a 9-Watt UVC lamp with synthetic zinc oxide nanoparticles for degradation of atenolol is studied.Material and method: The main objective of this work is to investigate the effect of synthetic zinc oxide photo-catalyst on the rate of destruction of atenolol as an organic pollutant in wastewater using low-intensity UV light. The effects of parameters such as concentration of atenolol, amount of photo-catalyst, pH, stirring rate, atmospheric nitrogen, and presence of various ions are studied in the photocatalytic reaction.Results: An oxidation reaction is performed under the optimal experimental conditions, i.e. 20 mg L-1 of atenolol, 10 mg L-1 of the photo-catalyst, pH 7.0, and a stirring rate of 600 rpm. After 120 minutes of irradiation, atenolol was degraded completely. Kinetic studies under optimized conditions are shown pseudo- first order kinetic.Conclusion: The results of this study indicate the acceptable performance of the photocatalytic degradation process of synthetic zinc oxide nanoparticles and 9-watt mercury vapor lamp in the decomposition of atenolol.
Sohrab Golmohammadi; Abdol Azim Alinejad; Afshin Ghaderpoury; Nezam Mirzaei; Mohammad Hossien Saghi; Mansour Ghaderpoori
Volume 23, Issue 4 , September and October 2016, , Pages 680-687
Abstract
Background Wastewater from textile dyes, which contain organic pollutants, is a major source of environmental contamination. This study aimed to determine the efficiency of the photo-catalytic process of ZnO nanoparticles in removing Acid Black 1 from aqueous solutions.Methods & Materials This study ...
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Background Wastewater from textile dyes, which contain organic pollutants, is a major source of environmental contamination. This study aimed to determine the efficiency of the photo-catalytic process of ZnO nanoparticles in removing Acid Black 1 from aqueous solutions.Methods & Materials This study was quasi-experimental. The nanoparticles were synthesized in the laboratory. To determine their characteristics some tests, including SEM, XRD and particle size distribution were done. The optimum pH was determined in the test, then, by maintaining the optimum pH, hydrogen peroxide concentration, dye concentration and different concentrations of nanoparticles were studied.Results The results showed that the removal efficiency of this process is maximum at pH=4 and equals to 1.15%. The best color removal efficiency was obtained at a concentration of 5 mg/l. The maximum and minimum removal efficiency as a color block acid were obtained at a concentration of 30 and 5 Mmol/mL of hydrogen peroxide, respectively.Conclusion Nano-photo catalytic process is a highly efficient method for the removal of dyes in aqueous solutions. In this process, organic materials are converted into less toxic substances also the energy of sunlight, which is used in this process is normally available