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- 摘要
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Gallium Oxide || Ga2O3-photoassisted decomposition of insecticides
摘要： Recent years have witnessed an ever increase in the production of many insecticides that contain fluorine and/or trifluoromethyl groups [1]. These fluorinated chemicals have excellent physicochemical characteristics such as, adsorption, hydrophobicity, thermal chemical stability, and bioactivity [2]. Accordingly, they have attracted intense investigations and have been applied in various fields [3]. Reports have appeared regarding contamination of common insecticides, health risks, and pollutant-treatment systems. However, scant research is being carried out on the decomposition of fluorinated substances. The perfluorinated chemicals such as perfluorooctanoic acid (PFOA) and the perfluorooctanesulfonate (PFOS) surfactant were produced by DuPont in the United States in 1947. Seven decades have elapsed since their developments [4]. PFOA and PFOS have also been used in firefighting water sprays in great amounts resulting in the worldwide contamination of aquatic environments. Because the quantities used were low in the beginning, people failed to recognize the potential hazards of these perfluorinated chemicals. Yet recently the production has increased considerably with its inevitable serious ecological and environmental results caused by the use of these fluorinated chemicals.
关键词： photocatalytic degradation,wastewater treatment,fluorinated chemicals,Ga2O3,insecticides
更新于2025-09-09 09:28:46
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Nano Structured Ni and Ru Impregnated TiO <sub/>2</sub> Photocatalysts: Synthesis, Characterization and Photocatalytic Degradation of Neonicotinoid Insecticides
摘要： Titania by sol gel and Ni–Ru titania catalysts by wet impregnation methods were prepared and characterized by XRD, UV-DRS, BET and TEM techniques. Catalytic activities of the photocatalysts were evaluated towards the degradation of three widely used neonicotinoids type insecticides namely acetamiprid, imidacloprid and thiamethoxam under UV, Visible and solar irradiations. The reaction parameters such as initial concentration of the insecticide, weight of the catalyst and pH of the system were found to influence the reaction rate. The results indicated that the metal impregnated catalysts were found to be more active than pure TiO2. Ni/TiO2 or Ru/TiO2 catalysts degraded all the insecticides completely even under visible irradiation. The observed visible activity of the catalysts was attributed to their lower band gap values. HPLC and TOC analyses revealed that mineralisation of the insecticides occurred through dearomatization by multiple hydroxylation and oxidation. The degradation pathway and the kinetics were also discussed in detail.
关键词： HPLC,Photocatalysis,Sol–Gel Method,Titania,Neonicotinoids,Insecticides
更新于2025-09-04 15:30:14