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Effect of various microwave frequencies on the physiology of a cyanobacterium, Schizothrix mexicana

100%

Asadi A., Soltani N., Asadi A.

Acta Physiologiae Plantarum

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2013

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tom 35

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nr 04

The effect of microwave modulated with square waves of different pulse repetition frequencies was studied on the physiologic behavior of the cyanobacterium Schizothrix mexicana Gomont (Oscillatorials). The organism was exposed for 2 h to microwave (9.685 GHz) modulated with square wave pulse repetition frequencies of 900, 720, 540, 360 and 180 Hz at a fixed incident power density (0.768 mW/cm2). Results revealed that growth rate, dry weight and photosynthetic pigments increased significantly especially in frequency of 540 Hz. Total carbohydrate and protein contents, and photosynthesis and nitrogenase activity showed drastic increase in 180, 360 and 540 Hz and dropped down when treated with 720 and 900 Hz frequency. This study revealed that the increase effect of microwave radiation on metabolism of Schizothrix mexicana was found to be frequency dependent. So, electrostimulation of Schizothrix mexicana provides a new extended domain of disciplines and methodologies for cultivation, processing of biomass and biofuels, biofertilizers and biotechnology applications. This study reveals that microwaves athermally induce different biologic effects.

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Regression modelling of air quality based on meteorological parameters and satellite data

71%

Asadi A., Goharnejad H., Niri M. Z.

Journal of Elementology

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2019

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tom 24

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nr 1

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Optimizing parameters on nanophotocatalytic degradation of ibuprofen using UVC/ZnO processes by response surface methodology

63%

Rastkari N., Eslami A., Nasseri S., Piroti E., Asadi A.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 2

Due to the increasing importance of low-concentrated pollution of water resources, the photocatalytic decomposition of ibuprofen down to low ppm concentrations over zinc oxide catalyst has been studied. The aim of this work was to evaluate the degradation of the non-steroidal anti-inflammatory drug (NSAID) ibuprofen (IBP) using heterogeneous ZnO photocatalyst under UV-C irradiation. The photo catalyst was characterized by field emission scanning electron microscope (FE-SEM) and x-ray diffraction (XRD). The photocatalytic activity of ZnO nanoparticle was evaluated in a cylindrical glass reactor under VU-C irradiation light. Central composite design (CCD) and response surface methodology (RSM) were employed for modeling and optimizing the IBP degradation under different variables such as initial pH, ZnO loading, humic acid concentration, initial IBP concentration, and reaction time. The results of our experiments showed that the reaction time had its highest positive effect on IBP degradation. The correlation coefficient (R²) value of 0.856 indicated a good agreement between the experimental results and the model predictions. Optimization results showed that the maximum IBP degradation was attained at optimum conditions of pH 6.7, catalyst loading 583 mg/L, initial IBP concentration 1.5 mg/L, humic acid concentration 54 mg/L, and reaction time of 95 min. Under these conditions we achieved maximum IBP removal efficiency of 82.97%. In conclusion, ZnO was found to be an effective photo catalyst and a promising alternative for producing free OH radicals for degradation of ibuprofen as an emerging pollutant in water resources.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Journal of Elementology

1 Polish Journal of Environmental Studies

3 Asadi A.

1 Eslami A.

1 Goharnejad H.

1 Nasseri S.

1 Niri M. Z.

1 Piroti E.

1 Rastkari N.

1 Soltani N.

1 2019

1 2017

1 2013

Effect of various microwave frequencies on the physiology of a cyanobacterium, Schizothrix mexicana

Regression modelling of air quality based on meteorological parameters and satellite data

Optimizing parameters on nanophotocatalytic degradation of ibuprofen using UVC/ZnO processes by response surface methodology