The Experts below are selected from a list of 14637 Experts worldwide ranked by ideXlab platform
Mehrdad Farrokhi - One of the best experts on this subject based on the ideXlab platform.
-
photocatalytic degradation of Diazinon with illuminated zno tio2 composite
Journal of The Taiwan Institute of Chemical Engineers, 2015Co-Authors: Ahmad Jonidijafari, Jae-kyu Yang, Mehdi Shirzadsiboni, Mohammad Naimijoubani, Mehrdad FarrokhiAbstract:Abstract ZnO–TiO 2 composite was used as a photocatalyst for the degradation of Diazinon. Effects of various parameters such as composite dosage, pH, initial Diazinon concentration, dissolved oxygen concentration, hydrogen peroxide concentration and type of organic compounds on the removal efficiency of Diazinon were studied. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used for characterization of the prepared composite. Immobilization of zinc oxide nanoparticles onto TiO 2 was identified by EDX, XRD and FT-IR analysis. Photocatalytic degradation efficiency of Diazinon was increased as the composite dosage increased up to 0.5 g/L. Neutral pH was selected as an optimal condition due to a photo-corrosion of ZnO in acidic and basic conditions. Photocatalytic degradation efficiency of Diazinon was decreased with increasing initial Diazinon concentration. Pseudo-first order rate constant ( k obs ) was decreased from 0.1234 to 0.001 min -1 and electrical energy per order (E EO ) was increased from 38.9 to 4800 kWh/m 3 with increasing Diazinon concentration from 5 to 50 mg/L, respectively. Photocatalytic degradation efficiency of Diazinon was increased with oxygen purging and addition of hydrogen peroxide while it was decreased in the presence of organic compounds. Photocatalytic activity was maintained even after five successive cycles.
-
Photocatalytic degradation of Diazinon with illuminated ZnO–TiO2 composite
Journal of the Taiwan Institute of Chemical Engineers, 2015Co-Authors: Ahmad Jonidi-jafari, Jae-kyu Yang, Mehdi Shirzad-siboni, Mohammad Naimi-joubani, Mehrdad FarrokhiAbstract:Abstract ZnO–TiO 2 composite was used as a photocatalyst for the degradation of Diazinon. Effects of various parameters such as composite dosage, pH, initial Diazinon concentration, dissolved oxygen concentration, hydrogen peroxide concentration and type of organic compounds on the removal efficiency of Diazinon were studied. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) were used for characterization of the prepared composite. Immobilization of zinc oxide nanoparticles onto TiO 2 was identified by EDX, XRD and FT-IR analysis. Photocatalytic degradation efficiency of Diazinon was increased as the composite dosage increased up to 0.5 g/L. Neutral pH was selected as an optimal condition due to a photo-corrosion of ZnO in acidic and basic conditions. Photocatalytic degradation efficiency of Diazinon was decreased with increasing initial Diazinon concentration. Pseudo-first order rate constant ( k obs ) was decreased from 0.1234 to 0.001 min -1 and electrical energy per order (E EO ) was increased from 38.9 to 4800 kWh/m 3 with increasing Diazinon concentration from 5 to 50 mg/L, respectively. Photocatalytic degradation efficiency of Diazinon was increased with oxygen purging and addition of hydrogen peroxide while it was decreased in the presence of organic compounds. Photocatalytic activity was maintained even after five successive cycles.
Yi-heng Shih - One of the best experts on this subject based on the ideXlab platform.
-
Facilitated ultrasonic irradiation in the degradation of Diazinon insecticide
Sustainable Environment Research, 2016Co-Authors: Chi-kang Wang, Yi-heng ShihAbstract:Abstract In this study, the degradation of Diazinon insecticide was investigated using ultrasound facilitated by Fenton's and Fenton-like reagents under various experimental conditions. The effects of oxidant (persulphate ions, S2 O 8 2 − and hydrogen peroxide (H2O2)), transition metal (including Co2+, Ag+ and Fe2+), Fenton's reagent concentration and temperature on Diazinon degradation were examined. A solution with an initial Diazinon concentration of 50 mg L−1 was used in this study. Ultrasonic irradiation in combination with Fenton's and Fenton-like reagents not only effectively degraded Diazinon but also rapidly reduced its toxicity. The optimal experimental conditions were determined as follows: 20 mg L−1 Fe2+, 150 mg L−1 H2O2, 25 °C and pH 3. After reacting for 60 min, the Diazinon removal efficiency reached 98%, with a mineralization efficiency of 30%. Degradation occurred primarily via oxidation and resulted in the substitution of sulphur with oxygen in the Diazinon P S bond.
-
degradation and detoxification of Diazinon by sono fenton and sono fenton like processes
Separation and Purification Technology, 2015Co-Authors: Chi-kang Wang, Yi-heng ShihAbstract:Abstract The degradation of the organophosphorus pesticide Diazinon by means of sono-Fenton and sono-Fenton-like systems was investigated in this study. The effects of a combination of transition metals, the concentration of Fenton’s reagent and temperature on Diazinon degradation were examined. An initial concentration of 50 mg L −1 Diazinon was used in this study as a model solution. For the sono-Fenton and sono-Fenton-like experiments, an ultrasonic probe at a frequency of 20 kHz was employed. The optimal experimental conditions were determined to be as follows: 20 mg L −1 Fe 2+ , 150 mg L −1 H 2 O 2 , 25 °C and pH 3. According to the results, the Diazinon removal efficiency after 60 min was 98.3%, and the mineralization efficiency was 29.9%. It was also found that the toxicity of the Diazinon solution was efficiently reduced by a sono-Fenton process. The most important mechanism of degradation was the substitution of sulfur by oxygen on the P S bond in Diazinon through oxidation.
Yusuf Kalender - One of the best experts on this subject based on the ideXlab platform.
-
the effects of organophosphate insecticide Diazinon on malondialdehyde levels and myocardial cells in rat heart tissue and protective role of vitamin e
Pesticide Biochemistry and Physiology, 2006Co-Authors: Ayse Ogutcu, Meltem Uzunhisarcikli, Suna Kalender, Dilek Durak, Fatma Bayrakdar, Yusuf KalenderAbstract:Abstract Diazinon is an organophosphate insecticide has been used in agriculture and domestic for several years. Vitamin E (200 mg/kg, twice a week), Diazinon (10 mg/kg, per day), and vitamin E (200 mg/kg, twice a week)+Diazinon (10 mg/kg, per day) combination was given to rats orally via gavage for 7 weeks. Body and heart weights, malondialdehyde (MDA) level in heart tissue and ultrastructural changes in myocardial cells were investigated at the end of the 1st, 4th, and 7th weeks comparatively with control group. When Diazinon-treated group was compared to control group body and heart weights were decreased significantly at the end of the 4th and 7th weeks. It was observed that, at the end of 1st, 4th, and 7th weeks there was a statistically significant increase in MDA levels when Diazinon- and vitamin E +Diazinon-treated groups were compared to control group. While at the end of the 1st week statistically significant changes were not being observed, at the end of 4th and 7th weeks statistically significant decrease was detected in MDA levels when vitamin E+Diazinon-treated group was compared to Diazinon-treated group. In our electron microscopic investigations, while vacuolization and swelling of mitochondria myocardial cells of Diazinon-treated rats were being observed, swelling of several mitochondria were observed in vitamin E+Diazinon-treated rats. We conclude that vitamin E reduces Diazinon cardiotoxicity, but vitamin E does not protect completely.
-
effects of Diazinon on pseudocholinesterase activity and haematological indices in rats the protective role of vitamin e
Environmental Toxicology and Pharmacology, 2006Co-Authors: Yusuf Kalender, Meltem Uzunhisarcikli, Ayse Ogutcu, Fatma Acikgoz, Suna KalenderAbstract:Diazinon (DZN) is an organophosphate insecticide has been used in agriculture and domestic for several years. Vitamin E (200mg/kg, twice a week), Diazinon (10mg/kg, per day) and Vitamin E (200mg/kg, twice a week)+Diazinon (10mg/kg, per day) combination were given to rats orally via gavage for 7 weeks. Pseudocholinesterase in serum and haematological indices were investigated at the end of the 1st, 4th and 7th weeks comparatively with control group. At the end of 1st, 4th and 7th weeks, statistically significant decrease of pseudocholinesterase activity in serum were detected when Diazinon- and Vitamin E+Diazinon-treated groups compared to control group. When Diazinon- and Vitamin E+Diazinon-treated groups were compared to each other there were no significant changes. When Diazinon-treated group was compared to control group, body weight decreased significantly at the end of the 4th and 7th weeks. It was observed that at the end of 1st, 4th and 7th weeks, there was a statistically significance in haematological indices except mean corpuscular hemoglobin (MCH) when Diazinon-treated group was compared to control group. At the end of 1st week increase of thrombocyte, at the end of the 4th week increase of hemoglobin and thrombocyte and at the end of the 7th week increase of red blood cell (RBC), hemoglobin, hematocrit, mean corpuscular hemoglobin concentration (MCHC) and thrombocyte were observed statistically significant when Vitamin E+Diazinon treated group was compared with Diazinon treated group. According to the present study, we conclude that Vitamin E reduces Diazinon toxicity, but it does not protect completely.
Suna Kalender - One of the best experts on this subject based on the ideXlab platform.
-
the effects of organophosphate insecticide Diazinon on malondialdehyde levels and myocardial cells in rat heart tissue and protective role of vitamin e
Pesticide Biochemistry and Physiology, 2006Co-Authors: Ayse Ogutcu, Meltem Uzunhisarcikli, Suna Kalender, Dilek Durak, Fatma Bayrakdar, Yusuf KalenderAbstract:Abstract Diazinon is an organophosphate insecticide has been used in agriculture and domestic for several years. Vitamin E (200 mg/kg, twice a week), Diazinon (10 mg/kg, per day), and vitamin E (200 mg/kg, twice a week)+Diazinon (10 mg/kg, per day) combination was given to rats orally via gavage for 7 weeks. Body and heart weights, malondialdehyde (MDA) level in heart tissue and ultrastructural changes in myocardial cells were investigated at the end of the 1st, 4th, and 7th weeks comparatively with control group. When Diazinon-treated group was compared to control group body and heart weights were decreased significantly at the end of the 4th and 7th weeks. It was observed that, at the end of 1st, 4th, and 7th weeks there was a statistically significant increase in MDA levels when Diazinon- and vitamin E +Diazinon-treated groups were compared to control group. While at the end of the 1st week statistically significant changes were not being observed, at the end of 4th and 7th weeks statistically significant decrease was detected in MDA levels when vitamin E+Diazinon-treated group was compared to Diazinon-treated group. In our electron microscopic investigations, while vacuolization and swelling of mitochondria myocardial cells of Diazinon-treated rats were being observed, swelling of several mitochondria were observed in vitamin E+Diazinon-treated rats. We conclude that vitamin E reduces Diazinon cardiotoxicity, but vitamin E does not protect completely.
-
effects of Diazinon on pseudocholinesterase activity and haematological indices in rats the protective role of vitamin e
Environmental Toxicology and Pharmacology, 2006Co-Authors: Yusuf Kalender, Meltem Uzunhisarcikli, Ayse Ogutcu, Fatma Acikgoz, Suna KalenderAbstract:Diazinon (DZN) is an organophosphate insecticide has been used in agriculture and domestic for several years. Vitamin E (200mg/kg, twice a week), Diazinon (10mg/kg, per day) and Vitamin E (200mg/kg, twice a week)+Diazinon (10mg/kg, per day) combination were given to rats orally via gavage for 7 weeks. Pseudocholinesterase in serum and haematological indices were investigated at the end of the 1st, 4th and 7th weeks comparatively with control group. At the end of 1st, 4th and 7th weeks, statistically significant decrease of pseudocholinesterase activity in serum were detected when Diazinon- and Vitamin E+Diazinon-treated groups compared to control group. When Diazinon- and Vitamin E+Diazinon-treated groups were compared to each other there were no significant changes. When Diazinon-treated group was compared to control group, body weight decreased significantly at the end of the 4th and 7th weeks. It was observed that at the end of 1st, 4th and 7th weeks, there was a statistically significance in haematological indices except mean corpuscular hemoglobin (MCH) when Diazinon-treated group was compared to control group. At the end of 1st week increase of thrombocyte, at the end of the 4th week increase of hemoglobin and thrombocyte and at the end of the 7th week increase of red blood cell (RBC), hemoglobin, hematocrit, mean corpuscular hemoglobin concentration (MCHC) and thrombocyte were observed statistically significant when Vitamin E+Diazinon treated group was compared with Diazinon treated group. According to the present study, we conclude that Vitamin E reduces Diazinon toxicity, but it does not protect completely.
Chi-kang Wang - One of the best experts on this subject based on the ideXlab platform.
-
Facilitated ultrasonic irradiation in the degradation of Diazinon insecticide
Sustainable Environment Research, 2016Co-Authors: Chi-kang Wang, Yi-heng ShihAbstract:Abstract In this study, the degradation of Diazinon insecticide was investigated using ultrasound facilitated by Fenton's and Fenton-like reagents under various experimental conditions. The effects of oxidant (persulphate ions, S2 O 8 2 − and hydrogen peroxide (H2O2)), transition metal (including Co2+, Ag+ and Fe2+), Fenton's reagent concentration and temperature on Diazinon degradation were examined. A solution with an initial Diazinon concentration of 50 mg L−1 was used in this study. Ultrasonic irradiation in combination with Fenton's and Fenton-like reagents not only effectively degraded Diazinon but also rapidly reduced its toxicity. The optimal experimental conditions were determined as follows: 20 mg L−1 Fe2+, 150 mg L−1 H2O2, 25 °C and pH 3. After reacting for 60 min, the Diazinon removal efficiency reached 98%, with a mineralization efficiency of 30%. Degradation occurred primarily via oxidation and resulted in the substitution of sulphur with oxygen in the Diazinon P S bond.
-
degradation and detoxification of Diazinon by sono fenton and sono fenton like processes
Separation and Purification Technology, 2015Co-Authors: Chi-kang Wang, Yi-heng ShihAbstract:Abstract The degradation of the organophosphorus pesticide Diazinon by means of sono-Fenton and sono-Fenton-like systems was investigated in this study. The effects of a combination of transition metals, the concentration of Fenton’s reagent and temperature on Diazinon degradation were examined. An initial concentration of 50 mg L −1 Diazinon was used in this study as a model solution. For the sono-Fenton and sono-Fenton-like experiments, an ultrasonic probe at a frequency of 20 kHz was employed. The optimal experimental conditions were determined to be as follows: 20 mg L −1 Fe 2+ , 150 mg L −1 H 2 O 2 , 25 °C and pH 3. According to the results, the Diazinon removal efficiency after 60 min was 98.3%, and the mineralization efficiency was 29.9%. It was also found that the toxicity of the Diazinon solution was efficiently reduced by a sono-Fenton process. The most important mechanism of degradation was the substitution of sulfur by oxygen on the P S bond in Diazinon through oxidation.