The Experts below are selected from a list of 53541 Experts worldwide ranked by ideXlab platform
Ronald F. Turco - One of the best experts on this subject based on the ideXlab platform.
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Rapid and Complete Degradation of the herbicide picloram by Lipomyces kononenkoae.
Journal of agricultural and food chemistry, 2009Co-Authors: Michael J. Sadowsky, William C. Koskinen, Marianne Bischoff, Brian L. Barber, Joanna M. Becker, Ronald F. TurcoAbstract:An enrichment culture approach was used to isolate a pure culture of the yeast Lipomyces kononenkoae, which had the ability to grow on the herbicide picloram. The yeast rapidly and Completely degra...
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rapid and Complete Degradation of the herbicide picloram by lipomyces kononenkoae
Journal of Agricultural and Food Chemistry, 2009Co-Authors: Michael J. Sadowsky, William C. Koskinen, Marianne Bischoff, Brian L. Barber, Joanna M. Becker, Ronald F. TurcoAbstract:An enrichment culture approach was used to isolate a pure culture of the yeast Lipomyces kononenkoae, which had the ability to grow on the herbicide picloram. The yeast rapidly and Completely degraded 50 μg mL−1 picloram by 48 h of growth. While L. kononenkoae was found to use both N atoms of picloram as a sole nitrogen source for growth, it failed to mineralize the herbicide or use it as a sole C source. Product analysis done using LC-ESI-MS indicated that bioDegradation of picloram by L. kononenkoae proceeds via a didechlorinated, dihydroxylated, pyridinecarboxylic acid derivative. Our results are consistent with the hypothesis that the majority of picloram Degradation in the soil is likely due to microbial catabolic processes.
Mehmet A Oturan - One of the best experts on this subject based on the ideXlab platform.
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Degradation of nystatin in aqueous medium by coupling uv c irradiation h 2 o 2 photolysis and photo fenton processes
Environmental Science and Pollution Research, 2019Co-Authors: Amira Boucenna, Nihal Oturan, Malika Chabani, Souad Bouafiachergui, Mehmet A OturanAbstract:Oxidative Degradation and mineralization of the antifungal drug Nystatin (NYS) was investigated using photochemical advanced oxidation processes UV-C irradiation (280–100 nm), H2O2 photolysis (UV/H2O2), and photo-Fenton (UV/H2O2/Fe3+). The effect of operating parameters such as [H2O2], [Fe3+], and [NYS] initial concentrations on Degradation efficiency and mineralization ability of different processes was comparatively examined in order to optimize the processes. Photo-Fenton was found to be the most efficient process attaining Complete Degradation of 0.02 mM (19.2 mg L−1) NYS at 2 min and a quasi-Complete mineralization (97%) of its solution at 5 h treatment while UV/H2O2 and UV-C systems require significantly more time for Complete Degradation and lower mineralization degrees. The Degradation and mineralization kinetics were affected by H2O2 and Fe3+ initial concentration, the optimum dosages being 4 mM and 0.4 mM, respectively. Consumption of H2O2 during photo-Fenton treatment is very fast during the first 30 min leading to the appearance of two stages in the mineralization. The evolution of toxicity of treated solutions was assessed and confirmed the effectiveness of photo-Fenton process for the detoxification of NYS solution at the end of treatment. Application to real wastewater from pharmaceutical industry containing the target molecule NYS showed the effectiveness of photo-Fenton process since it achieved 92% TOC removal rate at 6-h treatment time.
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optimization of electro fenton process for effective Degradation of organochlorine pesticide lindane
Catalysis Today, 2017Co-Authors: Carmen M Dominguez, Arturo Romero, Aurora Santos, Nihal Oturan, Mehmet A OturanAbstract:Abstract Lindane is an organochlorine pesticide broadly used in the last decades. It is persistent and recalcitrant in aquatic environments and difficult to biodegrade. This study is focused on the Complete Degradation of lindane by an electrochemical advanced oxidation process, the electro-Fenton (EF) process, using a BDD anode and carbon felt (CF) cathode. The influence of the main operating parameters, i.e., applied current intensity (50–1000 mA), catalyst concentration (0.0–0.5 mM) and initial pollutant concentration (5.0–10.0 mg L−1) has been investigated and optimized. The applied current plays a determinant role both in oxidation of lindane and mineralization of its aqueous solution. Taking into account the mineralization current efficiency (MCE) and the specific energy consumption (EC), the applied current of 400 mA was found to be the most convenient value. Catalyst (Fe2+) concentration as low as 0.05 mM, promotes efficiently H2O2 decomposition into hydroxyl radicals improving the efficiency of the process and minimizing the involvement of parasitic reactions. The initial pollutant concentration does not affect the performance of the process. At the optimum operating conditions, the Complete Degradation of 10 mg L−1 lindane solution and 80% of TOC removal were achieved at 15 min and 4 h, respectively.
Parag R Gogate - One of the best experts on this subject based on the ideXlab platform.
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Degradation of dichlorvos using hybrid advanced oxidation processes based on ultrasound
Journal of water process engineering, 2015Co-Authors: Pankaj N Patil, Parag R GogateAbstract:Abstract Degradation of dichlorvos pesticide has been investigated in an ultrasonic bath having operating power of 150 W and operating frequency of 36 kHz with a capacity of 7 L. All the experiments have been performed using 20 mg/L solution of commercially available dichlorvos at an operating pH of 3 under ambient conditions. Different combined treatment processes such as ultrasound (US)/TiO 2 , solar/TiO 2 , US/solar/TiO 2 , US/H 2 O 2 , US/Fenton and US/ozone have been applied with an objective of achieving effective and Complete Degradation of dichlorvos. The removal of dichlorvos was found to be significant in the case of TiO 2 /solar (78.42%) and US/Fenton (81.19%) in 2 h treatment as compared to only ultrasound (6.4%) or only TiO 2 (3%) which is a clear indication of the efficacy of combined treatment processes. Complete Degradation of dichlorvos was obtained by using combination of ozone and ultrasound. TOC analysis at optimum conditions was also performed to quantify the extent of mineralization and it has been observed that a maximum of 93% TOC reduction is obtained in the case of combination of ozone and ultrasound. Integral method of analysis was followed and it has been observed that pseudo-first order kinetics explains the Degradation reaction very well. The present work has conclusively established that cavitation in the presence of additives can be effectively used for Complete removal of dichlorvos pesticide at pilot scale operation.
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Degradation of imidacloprid using combined advanced oxidation processes based on hydrodynamic cavitation
Ultrasonics Sonochemistry, 2014Co-Authors: Pankaj N Patil, Sayli D Bote, Parag R GogateAbstract:Abstract The harmful effects of wastewaters containing pesticides or insecticides on human and aquatic life impart the need of effectively treating the wastewater streams containing these contaminants. In the present work, hydrodynamic cavitation reactors have been applied for the Degradation of imidacloprid with process intensification studies based on different additives and combination with other similar processes. Effect of different operating parameters viz. concentration (20–60 ppm), pressure (1–8 bar), temperature (34 °C, 39 °C and 42 °C) and initial pH (2.5–8.3) has been investigated initially using orifice plate as cavitating device. It has been observed that 23.85% Degradation of imidacloprid is obtained at optimized set of operating parameters. The efficacy of different process intensifying approaches based on the use of hydrogen peroxide (20–80 ppm), Fenton’s reagent (H 2 O 2 :FeSO 4 ratio as 1:1, 1:2, 2:1, 2:2, 4:1 and 4:2), advanced Fenton process (H 2 O 2 :Iron Powder ratio as 1:1, 2:1 and 4:1) and combination of Na 2 S 2 O 8 and FeSO 4 (FeSO 4 :Na 2 S 2 O 8 ratio as 1:1, 1:2, 1:3 and 1:4) on the extent of Degradation has been investigated. It was observed that near Complete Degradation of imidacloprid was achieved in all the cases at optimized values of process intensifying parameters. The time required for Complete Degradation of imidacloprid for approach based on hydrogen peroxide was 120 min where as for the Fenton and advance Fenton process, the required time was only 60 min. To check the effectiveness of hydrodynamic cavitation with different cavitating devices, few experiments were also performed with the help of slit venturi as a cavitating device at already optimized values of parameters. The present work has conclusively established that combined processes based on hydrodynamic cavitation can be effectively used for Complete Degradation of imidacloprid.
Michael J. Sadowsky - One of the best experts on this subject based on the ideXlab platform.
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Rapid and Complete Degradation of the herbicide picloram by Lipomyces kononenkoae.
Journal of agricultural and food chemistry, 2009Co-Authors: Michael J. Sadowsky, William C. Koskinen, Marianne Bischoff, Brian L. Barber, Joanna M. Becker, Ronald F. TurcoAbstract:An enrichment culture approach was used to isolate a pure culture of the yeast Lipomyces kononenkoae, which had the ability to grow on the herbicide picloram. The yeast rapidly and Completely degra...
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rapid and Complete Degradation of the herbicide picloram by lipomyces kononenkoae
Journal of Agricultural and Food Chemistry, 2009Co-Authors: Michael J. Sadowsky, William C. Koskinen, Marianne Bischoff, Brian L. Barber, Joanna M. Becker, Ronald F. TurcoAbstract:An enrichment culture approach was used to isolate a pure culture of the yeast Lipomyces kononenkoae, which had the ability to grow on the herbicide picloram. The yeast rapidly and Completely degraded 50 μg mL−1 picloram by 48 h of growth. While L. kononenkoae was found to use both N atoms of picloram as a sole nitrogen source for growth, it failed to mineralize the herbicide or use it as a sole C source. Product analysis done using LC-ESI-MS indicated that bioDegradation of picloram by L. kononenkoae proceeds via a didechlorinated, dihydroxylated, pyridinecarboxylic acid derivative. Our results are consistent with the hypothesis that the majority of picloram Degradation in the soil is likely due to microbial catabolic processes.
Stephanie Lambert - One of the best experts on this subject based on the ideXlab platform.
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hydrodechlorination and Complete Degradation of chlorinated compounds with the coupled action of pd sio2 and fe sio2 catalysts towards industrial catalyst synthesis conditions
Journal of environmental chemical engineering, 2019Co-Authors: Julien G Mahy, Ludivine Tasseroul, Olivier Tromme, Benoit Lavigne, Stephanie LambertAbstract:Abstract In this study, Pd/SiO2 and Fe/SiO2 catalysts have been synthesized by the cogelation process for hydrodechlorination applications. Different synthesis conditions were tested to approach the industrial conditions using industrial grade reactants and ambient air drying. The influence of these changes has been studied on the texture and the catalytic activity of the catalysts. The resulting materials are composed of metallic (Pd catalysts) or metallic oxide (Fe catalysts) nanoparticles highly dispersed in porous silica. The catalysts present a high specific surface area (between 250 and 500 m2/g) with a large pore size range between micro-, meso- and macropores. The modifications of the synthesis conditions give catalysts with similar textural properties compared to lab-scale catalysts. The catalytic activity of the binary catalysts have been evaluated on the hydrodechlorination of the 2,4,6-trichlorophenol (TCP) in water. Results show that Pd/SiO2 catalysts are able to dechlorinate the TCP and that Fe/SiO2 materials are able to degrade the resulting phenol. So this process allows a Complete Degradation of TCP. Industrial conditions catalysts show also similar catalytic results compared to lab-scale catalysts for the hydrodechlorination of the 2,4,6-trichlorophenol (TCP) in water.