Last modified: 2024-11-11
Abstract
One of the main environmental concerns in combatting pollution is the removal of hazardous substances from water resources. Water is one of the most important resources of man, however, this often gets polluted through the activities of man either directly or indirectly.
Pollution of water resources with industrial effluents containing toxic pigments such as Congo red, methyl orange, methylene blue, etc. is a serious problem for human health as well as the environment. Many of these dyes are toxic and pose a serious hazard to aquatic animals and eventually, man who ends up consuming these.Due to human activities, water is exposed to many pollutants either directly or indirectly .
There several types of water pollutant, including Groundwater Pollution, Surface Water Pollution, Suspended Matter, Oil Spillages, Microbiological Pollution, Chemical Water Pollution, Thermal Pollution, Oxygen-Depletion Pollution.
Thousands of different colors are used commercially in different industries such as plastics, cosmetics, paper and printing, textiles, and dyes to color various products. Many of these dyes are toxic and pose a serious hazard to aquatic animals and eventually man
In this research, Ag-ZnO-MOF nanocomposite was synthesized using chemical precipitation method in order to photocatalytically reduce methyl orange dye. Morphology, crystalline and photocatalytic structure of nanocomposite were investigated using scanning electron microscope, FTIR, X-ray diffraction and DRS, respectively. FTIR analysis has confirmed the formation of nanocomposite. According to the analysis of the penetrating reflectance spectrum of 3.3 electron volt bandgap nanocomposite, it was found that it is active in the ultraviolet light region. In the second part of the research, the effect of important parameters on the photocatalytic reduction of dye, such as pH of the solution, time, initial concentration of the pollutant in the solution and photocatalyst dose, was studied. The results showed that reducing the pH of the solution, increasing the time and amount of photocatalyst had a positive effect on reducing the color of methyl orange. In such a way that the highest photocatalytic reduction efficiency was obtained in optimal conditions of pH=2 with 0.03 grams of photocatalyst in 30 ppm dye solution equal to 96%.