Photocatalytic degradation of sulfamethoxazole(SMX) antibiotic has been studied under recycling batch and homogeneous flow conditions in a thin-film coated immobilized system namely parallel-plate(PPL) reactor. Experi...Photocatalytic degradation of sulfamethoxazole(SMX) antibiotic has been studied under recycling batch and homogeneous flow conditions in a thin-film coated immobilized system namely parallel-plate(PPL) reactor. Experimentally designed, statistically evaluated with a factorial design(FD) approach with intent to provide a mathematical model takes into account the parameters influencing process performance. Initial antibiotic concentration, UV energy level, irradiated surface area, water matrix(ultrapure and secondary treated wastewater) and time, were defined as model parameters. A full of 2~5 experimental design was consisted of 32 random experiments. PPL reactor test experiments were carried out in order to set boundary levels for hydraulic, volumetric and defined defined process parameters. TTIP based thin-film with polyethylene glycol + TiO_2 additives were fabricated according to pre-described methodology. Antibiotic degradation was monitored by High Performance Liquid Chromatography analysis while the degradation products were specified by LC–TOF-MS analysis. Acute toxicity of untreated and treated SMX solutions was tested by standard Daphnia magna method. Based on the obtained mathematical model, the response of the immobilized PC system is described with a polynomial equation. The statistically significant positive effects are initial SMX concentration,process time and the combined effect of both, while combined effect of water matrix and irradiated surface area displays an adverse effect on the rate of antibiotic degradation by photocatalytic oxidation. Process efficiency and the validity of the acquired mathematical model was also verified for levofloxacin and cefaclor antibiotics. Immobilized PC degradation in PPL reactor configuration was found capable of providing reduced effluent toxicity by simultaneous degradation of SMX parent compound and TBPs.展开更多
Porous Porous Co_(x)Ni_(1-x)TiO_(3) nanorods were successfully synthesized through a solution-based method following an ethylene glycol route at room temperature.The effect of calcination temperature from 300℃to 900...Porous Porous Co_(x)Ni_(1-x)TiO_(3) nanorods were successfully synthesized through a solution-based method following an ethylene glycol route at room temperature.The effect of calcination temperature from 300℃to 900℃ for NiTiO_(3) and CoTiO_(3) nanorods was studied using X-ray diffractometry and scanning electron microscopy in order to investigate their structural and morphological properties.The optimum calcination temperature to prepare pure ilmenite type structure rods with high crystallinity and hexagonal shape was 600Co_(x)Ni_(1-x)TiO_(3) exhibited the highest photocatalytic activity for the degradation of ethyl paraben,an endocrine disrupting compound,under simulated solar or visible light irradiation.Nearly complete(i.e.92%)paraben degradation occurred after 5 h of solar irradiation and this decreased to 48%when only the visible part of the radiation was employed.The solar photocatalytic activity of CoTiO_(3) and NiTiO_(3) was found to be 42%and 67%,respectively.展开更多
基金partially supported by the NKUBAP.00.17.DR.14.01 project
文摘Photocatalytic degradation of sulfamethoxazole(SMX) antibiotic has been studied under recycling batch and homogeneous flow conditions in a thin-film coated immobilized system namely parallel-plate(PPL) reactor. Experimentally designed, statistically evaluated with a factorial design(FD) approach with intent to provide a mathematical model takes into account the parameters influencing process performance. Initial antibiotic concentration, UV energy level, irradiated surface area, water matrix(ultrapure and secondary treated wastewater) and time, were defined as model parameters. A full of 2~5 experimental design was consisted of 32 random experiments. PPL reactor test experiments were carried out in order to set boundary levels for hydraulic, volumetric and defined defined process parameters. TTIP based thin-film with polyethylene glycol + TiO_2 additives were fabricated according to pre-described methodology. Antibiotic degradation was monitored by High Performance Liquid Chromatography analysis while the degradation products were specified by LC–TOF-MS analysis. Acute toxicity of untreated and treated SMX solutions was tested by standard Daphnia magna method. Based on the obtained mathematical model, the response of the immobilized PC system is described with a polynomial equation. The statistically significant positive effects are initial SMX concentration,process time and the combined effect of both, while combined effect of water matrix and irradiated surface area displays an adverse effect on the rate of antibiotic degradation by photocatalytic oxidation. Process efficiency and the validity of the acquired mathematical model was also verified for levofloxacin and cefaclor antibiotics. Immobilized PC degradation in PPL reactor configuration was found capable of providing reduced effluent toxicity by simultaneous degradation of SMX parent compound and TBPs.
基金the Stavros Niarchos Foundation within the framework of the project ARCHERS(“Advancing Young Researchers'Human Capital in Cutting Edge Technologies in the Preservation of Cultural Heritage and the Tackling of Societal Challenges”).Ms.M.Moschogiannaki acknowledges Onassis Foundation for providing a scholarship for graduate studies.
文摘Porous Porous Co_(x)Ni_(1-x)TiO_(3) nanorods were successfully synthesized through a solution-based method following an ethylene glycol route at room temperature.The effect of calcination temperature from 300℃to 900℃ for NiTiO_(3) and CoTiO_(3) nanorods was studied using X-ray diffractometry and scanning electron microscopy in order to investigate their structural and morphological properties.The optimum calcination temperature to prepare pure ilmenite type structure rods with high crystallinity and hexagonal shape was 600Co_(x)Ni_(1-x)TiO_(3) exhibited the highest photocatalytic activity for the degradation of ethyl paraben,an endocrine disrupting compound,under simulated solar or visible light irradiation.Nearly complete(i.e.92%)paraben degradation occurred after 5 h of solar irradiation and this decreased to 48%when only the visible part of the radiation was employed.The solar photocatalytic activity of CoTiO_(3) and NiTiO_(3) was found to be 42%and 67%,respectively.
