Journal of Photochemistry and Photobiology A-chemistry, 2002
The Co 3 O 4 /LiNbO 3 composites were synthesized by impregnation of LiNbO 3 in an aqueous soluti... more The Co 3 O 4 /LiNbO 3 composites were synthesized by impregnation of LiNbO 3 in an aqueous solution of cobalt nitrate and next by calcination at 400°C. The activity of produced samples has been investigated in the reaction of photocatalytic hydrogen generation. The crystallographic phases, optical and vibronic properties were studied using X-ray diffraction (XRD), diffuse reflectance (DR) UV-vis and resonance Raman spectroscopic techniques, respectively. The influence of cobalt content (range from 0.5 wt.% to 4 wt.%) on the photocatalytic activity of Co 3 O 4 /LiNbO 3 composites for photocatalytic hydrogen generation has been investigated. Co 3 O 4 /LiNbO 3 composites exhibited higher than LiNbO 3 photocatalytic activity for hydrogen generation. The highest H 2 evolution efficiency was observed for Co 3 O 4 /LiNbO 3 composite with 3 wt.% cobalt content. The amount of H 2 obtained in the presence of LiNbO 3 and Co 3 O 4 /LiNbO 3 (3 wt.% of cobalt content) was 1.38 µmol/min and 2.59 µmol min -1 , respectively. 920 Cent. Eur. J. Chem. • 11(6) • 2013 • 920-926
... ELSEVIER Applied Catalysis A: General 167 (1998) 65-74 On the nature of selective olefin oxid... more ... ELSEVIER Applied Catalysis A: General 167 (1998) 65-74 On the nature of selective olefin oxidation catalysts derived from molybdate-and tungstate-intercalated layered double hydroxides Elizabeth Gardner, Thomas J. Pmnavala ... [4] A. Mylonas, A. Hiskia, E. Papaconstantinou ...
... No. i SEPTEMBER 1967 A HISTORY OF CARGOISM IN SIO, NORTH-EAST NEW GUINEA By Thomas G. Harding... more ... No. i SEPTEMBER 1967 A HISTORY OF CARGOISM IN SIO, NORTH-EAST NEW GUINEA By Thomas G. Harding* Introduction ... range from 130 to 450. The total in 1964 was nearly 1,500, two-thirds of which consisted of villagers, the rest being migrant workers and their families. ...
Up to the present date, DDA (2,2-bis(chlorophenyl)acetic acid) resulting from the degradation of ... more Up to the present date, DDA (2,2-bis(chlorophenyl)acetic acid) resulting from the degradation of DDT (2,2-bis-(chlorophenyl)-1,1,1-trichloroethane) residues in the environment has been neglected as an environmental contaminant of the aquatic system. More than 60 years after the invention of DDT as an insecticide and more than 25 years after its use was banned in most of the developed countries, DDA was found as major contaminant up to the microgram per liter level in the surface water of the Teltowkanal in Berlin, Germany. DDA is formed together with some other intermediates of DDT such as DDD (2,2-bis-(chlorophenyl)-1,1-dichloroethane), DDE (2,2-bis(chlorophenyl)-1,1-dichloroethylene), DDMU (2,2-bis(chlorophenyl)-1chloroethylene), DDOH (2,2-bis(chlorophenyl)ethanol), DDMS (2,2-bis(chlorophenyl)-1-chloroethane), DDCN (2,2bis(chlorophenyl)acetonitrile), and DBP (dichlorobenzophenone), which were identified at lower concentrations in surface water of the canal. Our results add some new aspects to the ongoing controversy over the fate of DDT in the natural environment and confirm some laboratory experiments about the natural remediation of DDT residues. Moreover, the polar degradation product DDA is also a potential problem for drinking water production because it is the only DDT derivative that also leaches into the groundwater wells of a neighboring drinking water plant at concentrations exceeding the European maximum tolerance levels for pesticide residues in drinking water.
Degradation of the four pesticides by dissolved ozone was investigated in order to establish the ... more Degradation of the four pesticides by dissolved ozone was investigated in order to establish the effect of operational parameters: methylparathion, parathion, diazinon and cypermethrin. They were commonly used as broad-spectrum insecticides in pest control, and high residual levels had been detected in vegetables. In the present study, the effectiveness in pesticide oxidation in aqueous solution using low level of dissolved ozone was determined using solid-phase micro-extraction (SPME) and GC-MS. Dissolved ozone (1.4 mg/l) was effective to oxidize 60-99% of methyl-parathion, cypermethrin, parathion and diazinon in aqueous solution in 30 min and the degradation was mostly completed in the first 5 min. Trace amounts and unstable paraoxon and diazoxon were tentatively identified as primary ozonation byproducts of parathion and diazinon. The feasibilities of using low level of dissolved ozone (1.4-2.0 mg/l) for removal of the four pesticides residue on vegetable surface (Brassica rapa) were also tested. Ozone was mostly effective in cypermethrin removal (>60%). The removal efficiency of pesticides highly depended on the dissolved ozone levels and temperature. The present study validated that ozonation is a safe and promising process for the removal of the tested pesticides from aqueous solution and vegetable surface under domestic conditions.
Journal of Environmental Science and …, Jan 1, 2004
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately. This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.
... Thomas Rüther*a, Alan M. Bond*b and W. Roy Jacksonc. a Centre for Green Chemistry, Monash Uni... more ... Thomas Rüther*a, Alan M. Bond*b and W. Roy Jacksonc. a Centre for Green Chemistry, Monash University, PO Box 23, Victoria 3800, Australia. ... Chem., Int. Ed. Engl., 1991, 30, 34 Article . 9, (a) A. Hiskia, A. Mylonas and E. Papaconstantinou, Chem. Soc. ...
There is no data currently available on acidic pesticides in the drinking water of Greece, althou... more There is no data currently available on acidic pesticides in the drinking water of Greece, although considerable quantities of them are in use. In this study, the occurrence of the six most important acidic herbicides in the drinking water of Greece was investigated. The target compounds studied include four chlorophenoxy herbicides, namely mecoprop, dichlorprop, MCPA and 2,4-D, and two other acidic herbicides, i.e. bromoxynil and bentazone. Analysis was carried out at a concentration level of 100 ng L 1 using capillary gas chromatography-mass spectrometry (GC-MS) with selected ion monitoring (SIM). The method involved a pre-concentration with solid phase extraction and derivatization with pentafluorobenzyl bromide. Thirty-eight samples of drinking water from nine regions in Greece were screened. No herbicides were detected although fortification experiments with parallel water samples resulted in recovery rates better than 70%. The detection limits of the recovered compounds were found to be between 10 and 50 ng L 1 .
Journal of Photochemistry and Photobiology A-chemistry, 2002
The Co 3 O 4 /LiNbO 3 composites were synthesized by impregnation of LiNbO 3 in an aqueous soluti... more The Co 3 O 4 /LiNbO 3 composites were synthesized by impregnation of LiNbO 3 in an aqueous solution of cobalt nitrate and next by calcination at 400°C. The activity of produced samples has been investigated in the reaction of photocatalytic hydrogen generation. The crystallographic phases, optical and vibronic properties were studied using X-ray diffraction (XRD), diffuse reflectance (DR) UV-vis and resonance Raman spectroscopic techniques, respectively. The influence of cobalt content (range from 0.5 wt.% to 4 wt.%) on the photocatalytic activity of Co 3 O 4 /LiNbO 3 composites for photocatalytic hydrogen generation has been investigated. Co 3 O 4 /LiNbO 3 composites exhibited higher than LiNbO 3 photocatalytic activity for hydrogen generation. The highest H 2 evolution efficiency was observed for Co 3 O 4 /LiNbO 3 composite with 3 wt.% cobalt content. The amount of H 2 obtained in the presence of LiNbO 3 and Co 3 O 4 /LiNbO 3 (3 wt.% of cobalt content) was 1.38 µmol/min and 2.59 µmol min -1 , respectively. 920 Cent. Eur. J. Chem. • 11(6) • 2013 • 920-926
... ELSEVIER Applied Catalysis A: General 167 (1998) 65-74 On the nature of selective olefin oxid... more ... ELSEVIER Applied Catalysis A: General 167 (1998) 65-74 On the nature of selective olefin oxidation catalysts derived from molybdate-and tungstate-intercalated layered double hydroxides Elizabeth Gardner, Thomas J. Pmnavala ... [4] A. Mylonas, A. Hiskia, E. Papaconstantinou ...
... No. i SEPTEMBER 1967 A HISTORY OF CARGOISM IN SIO, NORTH-EAST NEW GUINEA By Thomas G. Harding... more ... No. i SEPTEMBER 1967 A HISTORY OF CARGOISM IN SIO, NORTH-EAST NEW GUINEA By Thomas G. Harding* Introduction ... range from 130 to 450. The total in 1964 was nearly 1,500, two-thirds of which consisted of villagers, the rest being migrant workers and their families. ...
Up to the present date, DDA (2,2-bis(chlorophenyl)acetic acid) resulting from the degradation of ... more Up to the present date, DDA (2,2-bis(chlorophenyl)acetic acid) resulting from the degradation of DDT (2,2-bis-(chlorophenyl)-1,1,1-trichloroethane) residues in the environment has been neglected as an environmental contaminant of the aquatic system. More than 60 years after the invention of DDT as an insecticide and more than 25 years after its use was banned in most of the developed countries, DDA was found as major contaminant up to the microgram per liter level in the surface water of the Teltowkanal in Berlin, Germany. DDA is formed together with some other intermediates of DDT such as DDD (2,2-bis-(chlorophenyl)-1,1-dichloroethane), DDE (2,2-bis(chlorophenyl)-1,1-dichloroethylene), DDMU (2,2-bis(chlorophenyl)-1chloroethylene), DDOH (2,2-bis(chlorophenyl)ethanol), DDMS (2,2-bis(chlorophenyl)-1-chloroethane), DDCN (2,2bis(chlorophenyl)acetonitrile), and DBP (dichlorobenzophenone), which were identified at lower concentrations in surface water of the canal. Our results add some new aspects to the ongoing controversy over the fate of DDT in the natural environment and confirm some laboratory experiments about the natural remediation of DDT residues. Moreover, the polar degradation product DDA is also a potential problem for drinking water production because it is the only DDT derivative that also leaches into the groundwater wells of a neighboring drinking water plant at concentrations exceeding the European maximum tolerance levels for pesticide residues in drinking water.
Degradation of the four pesticides by dissolved ozone was investigated in order to establish the ... more Degradation of the four pesticides by dissolved ozone was investigated in order to establish the effect of operational parameters: methylparathion, parathion, diazinon and cypermethrin. They were commonly used as broad-spectrum insecticides in pest control, and high residual levels had been detected in vegetables. In the present study, the effectiveness in pesticide oxidation in aqueous solution using low level of dissolved ozone was determined using solid-phase micro-extraction (SPME) and GC-MS. Dissolved ozone (1.4 mg/l) was effective to oxidize 60-99% of methyl-parathion, cypermethrin, parathion and diazinon in aqueous solution in 30 min and the degradation was mostly completed in the first 5 min. Trace amounts and unstable paraoxon and diazoxon were tentatively identified as primary ozonation byproducts of parathion and diazinon. The feasibilities of using low level of dissolved ozone (1.4-2.0 mg/l) for removal of the four pesticides residue on vegetable surface (Brassica rapa) were also tested. Ozone was mostly effective in cypermethrin removal (>60%). The removal efficiency of pesticides highly depended on the dissolved ozone levels and temperature. The present study validated that ozonation is a safe and promising process for the removal of the tested pesticides from aqueous solution and vegetable surface under domestic conditions.
Journal of Environmental Science and …, Jan 1, 2004
The user has requested enhancement of the downloaded file. All in-text references underlined in b... more The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately. This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.
... Thomas Rüther*a, Alan M. Bond*b and W. Roy Jacksonc. a Centre for Green Chemistry, Monash Uni... more ... Thomas Rüther*a, Alan M. Bond*b and W. Roy Jacksonc. a Centre for Green Chemistry, Monash University, PO Box 23, Victoria 3800, Australia. ... Chem., Int. Ed. Engl., 1991, 30, 34 Article . 9, (a) A. Hiskia, A. Mylonas and E. Papaconstantinou, Chem. Soc. ...
There is no data currently available on acidic pesticides in the drinking water of Greece, althou... more There is no data currently available on acidic pesticides in the drinking water of Greece, although considerable quantities of them are in use. In this study, the occurrence of the six most important acidic herbicides in the drinking water of Greece was investigated. The target compounds studied include four chlorophenoxy herbicides, namely mecoprop, dichlorprop, MCPA and 2,4-D, and two other acidic herbicides, i.e. bromoxynil and bentazone. Analysis was carried out at a concentration level of 100 ng L 1 using capillary gas chromatography-mass spectrometry (GC-MS) with selected ion monitoring (SIM). The method involved a pre-concentration with solid phase extraction and derivatization with pentafluorobenzyl bromide. Thirty-eight samples of drinking water from nine regions in Greece were screened. No herbicides were detected although fortification experiments with parallel water samples resulted in recovery rates better than 70%. The detection limits of the recovered compounds were found to be between 10 and 50 ng L 1 .
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