Browsing by Author "Sisay Demisse"

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    Photocatalytic Degradation of 2, 4-D Based Pesticide from Surface Water and Industrial Waste by Using TiO2-CuO-Clay Soil Composites
    (Addis Ababa University, 2024-05) Sisay Demisse; Tadesse Alemu; Mekonnen Abebayehu
    Pesticides are artificially synthesized organic and inorganic compounds that are used to control weeds and increase agricultural productivity. Nowadays pesticide contaminants are a major source of surface water pollutants. Repeated pesticide usage in the soil causes runoff that raises the concentrations of pesticides in surface water. For instance, Ziway Lake whose size is 7300 ha is contaminated with agricultural runoff every year. To resolve the problem of environmental pollution a lot of methods and technologies have been developed hither to, some of these technologies are either, inefficient or too expensive to be used widely. The main goal of this research is photocatalytic degradations of pesticides from surface water and Industrial waste by TiO2-CuO-Clay soil composites. The morphology, particle size and the resulting TiO2-CuO-Clay soil composite were characterized by XRD, SEM and FTIR. The composite catalyst was optimized by varying concentrations. The degradations of pesticides from surface water and pesticide factory effluents were done by UV-vis Lamp with wavelength 280 nm and the sample was retained for 2, 5, 7 and 9 h. The optimum pH value used was 4. After the irradiation of UV-vis light the degradation efficiency of 2,4-D was analyzed by HPLC. The effectiveness of pesticides removal was impacted by dopant proportions. Moreover, it was found that the removal efficiency of pesticides increased with increasing irradiation time and nanoparticle concentrations. Pesticides removal efficiency decreases with increasing pesticides concentration and contact time with respect to light intensity. Degradation efficiency of TiO2-CuO-Clay soil nanocomposite was 96.18% and 99.84% respectively from surface water and pesticide factory effluent. The study’s result shows that, TiO2-CuO-Clay soil nanocomposite is the effective photocatalyst for pesticides degradations from surface water and industrial waste.