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Removal of antibiotics in a parallel-plate thin-film-photocatalytic reactor: Process modeling and evolution of transformation by-products and toxicity

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Journal of Environmental Sciences 2017年第10期29卷 114-122页

作者： Can Burak?zkal zacharias frontistis Maria Antonopoulou Ioannis Konstantinou Dionissios Mantzavinos Süreyya Meric Environmental Engineering Namik Kemal University Faculty of Engineering Department of Chemical Engineering University of Patras Department of Environmental&Natural Resources Management University of Patras Department of Chemistry University of Ioannina

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 ＋ TiO2 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.

关键词： Thin-film photocatalysis Sulfamethoxazole (SMX) Levofloxacin (LVX) Cefaclor (CFL) Factorial design Modeling Parallel-plate reactor

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Porous Co_(x)Ni_(1-x)TiO_(3) nanorods for solar photocatalytic degradation of ethyl paraben

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Journal of Materiomics 2020年第4期6卷 788-799页

作者： Marilena Moschogiannaki zacharias frontistis George Kiriakidis Dionissios Mantzavinos Vassilios Binas Institute of Electronic Structure and Laser Foundation for Research and Technology-Hellas(FORTH-IESL)Greece Department of Material Science and Technology University of CreteHerakleioGreece Department of Physics University of CreteHerakleioGreece Department of Chemical Engineering University of PatrasCaratheodory 1University CampusGR-26504PatrasGreece Department of Chemical Engineering University of Western MacedoniaGR-50100KozaniGreece

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.

关键词： Solar photocatalysis Catalyst properties Cobalt-nickel titanates Endocrine disruptors

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Effectiveness of tertiary treatment processes in removing different classes of emerging contaminants from domestic wastewater

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Frontiers of Environmental Science & Engineering 2022年第11期16卷 261-272页

作者： Olga S.Arvaniti Marilena E.Dasenaki Alexandros G.Asimakopoulos Niki C.Maragou Vasilios G.Samaras Korina Antoniou Georgia Gatidou Daniel Mamais Constantinos Noutsopoulos zacharias frontistis Nikolaos S.Thomaidis Athanasios S.Stasinakis Department of Environment University of the AegeanMytilene 81100Greece Department of Chemical Engineering University of PatrasPatras 26504Greece Department of Agricultural Development Agrofood and Management of Natural ResourcesNational and Kapodistrian University of AthensPsachna 34400Greece Department of Chemistry National and Kapodistrian University of AthensAthens 15771Greece Department of Chemistry Norwegian University of Science and TechnologyTrondheim NO-7491Norway Core Labs King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Sanitary Engineering Laboratory Department of Water Resources and Environmental EngineeringSchool of Civil EngineeringNational Technical University of AthensAthens 15780Greece Department of Chemical Engineering University of Western MacedoniaKozani 50132Greece

In this work,38 different organic emerging contaminants(ECs),belonging to various chemical classes such as pharmaceuticals(PhCs),endocrine-disrupting chemicals(EDCs),benzotriazoles(BTRs),benzothiazoles(BTHs),and perfluorinated compounds(PFCs),were initially identified and quantified in the biologically treated wastewater collected from Athens’(Greece)Sewage Treatment Plant(STP).Processes already used in existing STPs such as microfiltration(MF),nanofiltration(NF),ultrafiltration(UF),UV radiation,and powdered activated carbon(PAC)were assessed for ECs’removal,under the conditions that represent their actual application for disinfection or advanced wastewater treatment.The results indicated that MF removed only one out of the 38 ECs and hence it was selected as pretreatment step for the other processes.UV radiation in the studied conditions showed low to moderate removal for 5 out of the 38 ECs.NF showed better results than UF due to the smaller pore sizes of the filtration system.However,this enhancement was observed mainly for 8 compounds originating from the classes of PhCs and PFCs,while the removal of EDCs was not statistically significant.Among the various studied technologies,PAC stands out due to its capability to sufficiently remove most ECs.In particular,removal rates higher than 70%were observed for 9 compounds,22 were partially removed,while 7 demonstrated low removal rates.Based on our screening experiments,future research should focus on scaling-up PAC in actual conditions,combining PAC with other processes,and conduct a complete economic and environmental assessment of the treatment.

关键词： Micropollutants Wastewater PAC Membranes UV Tertiary treatment

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