scholarly journals Mechanism of Ampicillin Degradation by Non-Thermal Plasma Treatment with FE-DBD

Plasma ◽  
2017 ◽  
Vol 1 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Joshua Smith ◽  
Isaac Adams ◽  
Hai-Feng Ji
Keyword(s):  
Plasma Treatment ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Resonance Spectroscopy ◽  
Air Plasma ◽  
Dbd Plasma ◽  
Plasma Treatment Time ◽  
Non Thermal Plasma ◽  
Air Plasma Treatment ◽  
Floating Electrode

This research focused on determining the effectiveness of non-thermal atmospheric pressure plasma as an alternative to advanced oxidation processes (AOP) for antibiotic removal in solution. For this study, 20 mM (6.988 g/L) solutions of ampicillin were treated with a floating electrode dielectric barrier discharge (FE-DBD) plasma for varying treatment times. The treated solutions were analyzed primarily using mass spectrometry (MS) and nuclear magnetic resonance spectroscopy (NMR). The preliminary product formed was Ampicillin Sulfoxide, however, many more species are formed as plasma treatment time is increased. Ampicillin was completely eliminated after five minutes of air-plasma treatment. The primary mechanism of ampicillin degradation by plasma treatment is investigated in this study.

scholarly journals A Study on the Effect of Ambient Air Plasma Treatment on the Properties of Methylammonium Lead Halide Perovskite Films

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 991 ◽  
Author(s):  
Masoud Shekargoftar ◽  
Jana Jurmanová ◽  
Tomáš Homola
Keyword(s):  
Plasma Treatment ◽  
Band Gap ◽  
Treatment Time ◽  
Perovskite Solar Cells ◽  
Ambient Air ◽  
Surface Barrier ◽  
Air Plasma ◽  
Plasma Treatment Time ◽  
Halide Perovskite ◽  
Air Plasma Treatment

Organic-inorganic halide perovskite materials are considered excellent active layers in the fabrication of highly efficient and low-cost photovoltaic devices. This contribution demonstrates that rapid and low-temperature air-plasma treatment of mixed organic-inorganic halide perovskite film is a promising technique, controlling its opto-electrical surface properties by changing the ratio of organic-to-inorganic components. Plasma treatment of perovskite films was performed with high power-density (25 kW/m2 and 100 W/cm3) diffuse coplanar surface barrier discharge (DCSBD) at 70 °C in ambient air. The results show that short plasma treatment time (1 s, 2 s, and 5 s) led to a relatively enlargement of grain size, however, longer plasma treatment time (10 s and 20 s) led to an etching of the surface. The band-gap energy of the perovskite films was related to the duration of plasma treatment; short periods (≤5 s) led to a widening of the band gap from ~1.66 to 1.73 eV, while longer exposure (>5 s) led to a narrowing of the band gap to approx. 1.63 eV and fast degradation of the film due to etching. Surface analysis demonstrated that the film became homogeneous, with highly oriented crystals, after short plasma treatment; however, prolonging the plasma treatment led to morphological disorders and partial etching of the surface. The plasma treatment approach presented herein addresses important challenges in current perovskite solar cells: tuning the optoelectronic properties and manufacturing homogeneous perovskite films.

Fast and clean functionalization of MWCNTs by DBD plasma and its influence on mechanical properties of C–epoxy composites

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62941-62945 ◽  
Author(s):  
K. Krushnamurty ◽  
I. Srikanth ◽  
G. H. Rao ◽  
P. S. R. Prasad ◽  
P. Ghosal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plasma Treatment ◽  
Epoxy Composites ◽  
Air Plasma ◽  
Dbd Plasma ◽  
Before And After ◽  
Air Plasma Treatment

TPD profile of various MWCNTs samples before and after air plasma treatment: (a) CO2 evolution, (b) CO evolution.

scholarly journals Surface Modification by the DBD Plasma to Improve the Flame-Retardant Treatment for Dyed Polyester Fabric

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 3011
Author(s):  
Ha-Thanh Ngo ◽  
Khanh Vu Thi Hong ◽  
The-Bach Nguyen
Keyword(s):  
Tensile Strength ◽  
Plasma Treatment ◽  
Flame Retardant ◽  
Contact Time ◽  
Treatment Time ◽  
Color Change ◽  
Polyester Fabric ◽  
Dbd Plasma ◽  
Plasma Pretreatment ◽  
Plasma Treatment Time

In the first part of the study, dyed polyester fabric was treated with a dielectric barrier discharge (DBD) plasma at 1 W/cm2 for 15, 30, 60 and 90 s. The wicking height, tensile strength and color of the control and plasma treated fabrics were measured. Results show that the fabric capillary increases with plasma treatment time up to 90 s. However, plasma treatment time longer than 60 s caused an obvious color change and decrease in tensile strength of fabric. Plasma contact time should be such that plasma can improve the hydrophilicity of the fabric and adversely affect the properties of the fabric as little as possible. Thus, the suitable plasma contact time should be less than 60 s. Based on these results, in the second part of the study, three different time levels (15, 20 and 30 s) were selected for plasma pretreatment of this fabric. The plasma-treated fabric was then padded with the flame retardant (FR) (CETAFLAM PDP 30), dried and finally cured at 190 °C for 120 s. The limited oxygen index (LOI) of FR fabrics and the vertical fire characteristics of FR fabric after being washed 5 times also were measured. Comparison of these results with those of FR fabrics without plasma pretreatment shows that plasma pretreatment improves the fabric’s flame retardancy and FR durability. Moreover, it also reduces the heat shrinkage of PET fabric due to high temperature curing. The scanning electron microscopy (SEM) images of the fabric after plasma treatment and FR treatment and the energy-dispersive spectroscopy (EDS) spectrum of the fabric are consistent with the above results.

scholarly journals Cold Atmospheric Pressure Argon Plasma Jet Assisted Degradation of Malachite Green (MG) Aqueous Solution

2020 ◽  
Vol 2 (1) ◽  
pp. 51-61
Author(s):  
Vasu D ◽  
Ramkumar M.C ◽  
Arunkumar A ◽  
Navaneetha Pandiyaraj K
Keyword(s):  
Aqueous Solution ◽  
Plasma Treatment ◽  
Malachite Green ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Oxidative Degradation ◽  
Atmospheric Pressure Plasma ◽  
Pressure Plasma ◽  
Plasma Treatment Time ◽  
Cold Atmospheric Pressure Plasma

The oxidative degradation of cold atmospheric pressure plasma assisted degradation of malachite Green (MG) was investigated in this study. Cold atmospheric pressure plasma assisted MG degradation process was carried out as a function various plasma treatment time (05, 10, and 15 mins). The % of degradation and presence carbon content in the plasma treated MG was examined by UV-Visible spectroscopy (UV-Vis) and total organic carbon (TOC) analyzer. Optical emission spectrometer was used to identify formation of various reactive species during in situ plasma treatment. The higher degradation percentage of 90% was obtained after plasma treatment time of 15 min and value of TOC also found to decreased significantly with increasing plasma treatment time.  Toxicity of the plasma-treated MG aqueous solution samples was also examined by Staphylococcus aureus (S.aureus) bacteria.

scholarly journals Plasma Induced Physicochemical Changes and Reactive Dyeing of Wool Fabrics

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
J. Udakhe ◽  
S. Honade ◽  
N. Shrivastava
Keyword(s):  
Plasma Treatment ◽  
Treatment Time ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Cysteic Acid ◽  
Wool Fabric ◽  
Dbd Plasma ◽  
Reactive Dyeing ◽  
Physicochemical Changes ◽  
Plasma Treatment Time

This study focuses on the effect of dielectric barrier discharge (DBD) plasma treatment on physical and chemical properties of wool fabric and its relation to exhaustion of Drimalan Navy Blue FBI reactive dye. AFM analysis of plasma treated wool fabric has shown partial removal of epicuticle and thus reduced scale height. FD spectroscopy has shown improvement in hydrophilicity by many folds after plasma treatment. ATR graphs depict the removal of hydrophobic layer of 18-MEA and introduction of hydrophilic groups like cysteic acid after plasma treatment. Alkali solubility of wool fabric increases with increasing plasma treatment time. Wetting time for plasma treated fabric reduces drastically when compared to untreated wool fabric. It is found that plasma treated fabric takes much lesser time to reach maximum dye exhaustion than untreated fabric. Substantivity of the dye increases significantly after plasma treatment. Colour fastness properties improve with increase in plasma treatment time. Chemical oxygen demand (COD) of spent dyebath liquor is found to reduce with increase in plasma treatment time. Biological oxygen demand (BOD) is found to be higher for plasma treated samples, while ratio of COD/BOD has reduced with increase in the plasma treatment time.

Study on Surface Hydrophilicity of Polypropylene Non-Woven Treated by Atmospheric Pressure Plasma

2012 ◽  
Vol 591-593 ◽  
pp. 1075-1078
Author(s):  
Yan Zhang
Keyword(s):  
Treatment Effect ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Woven Fabric ◽  
Dbd Plasma ◽  
Water Contact ◽  
Surface Hydrophilicity ◽  
Plasma Treatment Time ◽  
O2 Plasma

In this paper, polypropylene (PP) melt blown non-woven fabric is treated by atmospheric pressure N2 or N2/O2 dielectric barrier discharge (DBD) plasma. The variation of the surface hydrophilicity of PP sample is experimentally investigated by surface water contact angle, Fourier transform infrared reflectance spectroscopy (FTIR-ATR). The results show that the hydrophilicity of PP sample is considerably improved as long as the very short plasma treatment time (several seconds). However, the treatment effect of atmospheric N2/O2 plasma is worse than that of atmospheric N2 plasma early in the processing (0-7s). But the treatment effect of atmospheric N2/O2 plasma obtains improvement increasing the treatment time (>7s).

Surface modification of electrospun polycaprolactone microfibers by air plasma treatment: Effect of plasma power and treatment time

2016 ◽  
Vol 84 ◽  
pp. 502-513 ◽  
Author(s):  
L.A. Can-Herrera ◽  
A. Ávila-Ortega ◽  
S. de la Rosa-García ◽  
A.I. Oliva ◽  
J.V. Cauich-Rodríguez ◽  
...  
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Treatment Effect ◽  
Treatment Time ◽  
Plasma Power ◽  
Air Plasma ◽  
Air Plasma Treatment

Time-dependent effect on wetting and tribological properties of plasma-modified acrylonitrile–butadiene rubber (NBR) surface

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940050
Author(s):  
Zhao-Xiang Zhang ◽  
Ming-Xue Shen ◽  
Guang-Yao Xiong
Keyword(s):  
Plasma Treatment ◽  
Tribological Properties ◽  
Surface Composition ◽  
Treatment Time ◽  
Butadiene Rubber ◽  
Air Plasma ◽  
Storage Process ◽  
Frictional Behavior ◽  
Acrylonitrile Butadiene Rubber ◽  
Air Plasma Treatment

Different time air plasma treatment was conducted on acrylonitrile–butadiene rubber (NBR) surface, the wettability and friction behavior of the samples surface were measured after two months of storage. The changes in surface composition and microstructure during storage process were observed by X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM), respectively. The results show that the wettability of modified surface has obvious “hydrophobic recovery” phenomenon in the storage process, and the range of contact angle increase is closely related to the plasma treatment time, mainly because the change in surface composition at various time treatment are different during storage; the frictional behavior of plasma-modified NBR surface has not exhibited a “recovery” phenomenon after two months of storage, and the friction coefficient of the surface treated for 4 min and 8 min were even smaller than those before storage, which is due to the smoother and lower roughness of the surface morphology after storage. This study demonstrates that air plasma treatment is a promising technique for improving the wettability and tribological properties of NBR rubber, but the proper treatment time is needed to make the surface have the best wetting and frictional behavior.

HYDROPHILIC BEHAVIOR OF POLYMER FILMS TREATED BY ATMOSPHERIC PRESSURE PLASMA

2012 ◽  
Vol 20 (02) ◽  
pp. 1250007 ◽  
Author(s):  
SEUNG-HO SEO ◽  
SUNGHWAN CHANG ◽  
YEONG-EUN YOO ◽  
JAE DONG CHUNG
Keyword(s):  
Contact Angle ◽  
Plasma Treatment ◽  
Polymer Films ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Surface Characteristics ◽  
Optimum Operating ◽  
Optimum Operating Condition ◽  
Plasma Treatment Time

Experiment on the surface characteristics of polymer films (PC, PET, EVA) treated by atmospheric pressure plasma has been conducted. As the process parameters, we chose frequency, gas flow and treatment time. By measuring the contact angle, we scrutinized the effects of these parameters on the hydrophilic surface characteristics of polymer materials and found the optimum operating condition of each polymer for the highest hydropilicity. In the case of PC substrate, the contact angle was changed from 83.5 ± 1.1° (before plasma treatment) to 30.4 ± 0.4° (after plasma treatment) at the optimum operating condition of 30 kHz, CDA 0.6%, and repeated number of 7. In the case of PET substrate, the contact angle change was found from 59 ± 1.1° to 23.5 ± 1.7° at 20 kHz, CDA 0.6%, and repeated number of 7. In the case of EVA substrate, the contact angle of 84 ± 0.6° changed to 44.2 ± 1.2° at 30 kHz, CDA 0.6%, and repeated number of 7. The long-term stability of the hydrophilic surfaces and section morphology were also examined by SEM. As a roll-to-roll application, the adhesion force between PET and UV resin was measured to show initial increase according to the plasma treatment time, i.e., repeated number but finally saturated to show no meaningful change, which is in line with the behavior of the contact angle according to plasma treatment time.

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