Structure-Degradation Efficiency Studies in the Remediation of Aqueous Solutions of Dyes using Nanosecond-Pulsed DBD Plasma

2021 ◽  
pp. 119031
Author(s):  
S. Meropoulis ◽  
G. Rassias ◽  
V. Bekiari ◽  
C.A. Aggelopoulos
Keyword(s):  
Aqueous Solutions ◽  
Degradation Efficiency ◽  
Dbd Plasma ◽  
Structure Degradation

Synthesis and Photocatalytic Activity of Silicon-Substituted Hydroxyapatite

2014 ◽  
Vol 636 ◽  
pp. 115-117
Author(s):  
Ke Jun Liu ◽  
Hua Guang Yu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
Congo Red ◽  
Degradation Efficiency

Series of silicon-substituted hydroxyapatite were prepared and characterized, and their ability to degrade methyl orange and Congo red in aqueous solutions were studied. The effect of substituted silicon amount on the photocatalytic degradation efficiency of the dyes was investigated. The substitution of SiO44− groups for PO43− groups caused OH− loss and difference in the microstructure of hydroxyapatite, and the elimination rates of silicon-substituted hydroxyapatite decreased with the increasing of substituted silicon amount compared to that of pure hydroxyapatite.

Photodegradation of Two Antibiotics Involved with Fe (III) and Marine Algae

2012 ◽  
Vol 260-261 ◽  
pp. 1047-1051
Author(s):  
Li Yun Ge ◽  
Yong Gang Huang ◽  
De Xiang Gao ◽  
Huan Huan Deng
Keyword(s):  
High Pressure ◽  
Aqueous Solutions ◽  
Marine Algae ◽  
Degradation Efficiency ◽  
Photochemical Degradation ◽  
Mercury Lamp ◽  
Platymonas Subcordiformis ◽  
Ciprofloxacin Hydrochloride ◽  
Initial Concentration ◽  
Photodegradation Rate

The photochemical degradation of two antibiotics, enrofloxacin and ciprofloxacin hydrochloride, was preliminarily studied under irradiation with a high-pressure mercury lamp (HMPL) in this paper. The influence of initial concentration of antibiotics, Fe (Ⅲ) and platymonas subcordiformis on the degradation efficiency of antibiotics were investigated. The results suggested that in the presence of P. subcordiformis, the degradation efficiency of enrofloxacin and ciprofloxacin hydrochloride were 85.0% and 84.2% in aqueous solutions underwent photodegradation under HMPL irradiation, respectively. Moreover, the lower initial concentration of antibiotics improved photodegradation rate of antibiotics.

scholarly journals Decomposition of xylene in strong ionization non-thermal plasma at atmospheric pressure

2021 ◽  
Vol 233 ◽  
pp. 01033
Author(s):  
Yuan Jia ◽  
Chengwu Yi ◽  
Rongjie Yi ◽  
Miao Jiang ◽  
Baolin Zhang ◽  
...  
Keyword(s):  
Residence Time ◽  
Atmospheric Pressure ◽  
Barrier Discharge ◽  
Degradation Products ◽  
Degradation Mechanism ◽  
Degradation Efficiency ◽  
Dbd Plasma ◽  
Dielectric Barrier ◽  
Volatile Organic ◽  
Non Thermal Plasma

A large amount of volatile organic compounds (VOCs) produced by industry have caused serious environmental pollution. In this paper, the removal effect of simulated xylene by strong ionization dielectric barrier discharge (DBD) plasma at atmospheric pressure and its degradation mechanism and pathway were studied. The effect of gas residence time, and initial xylene concentration was studied. The results showed that higher voltage caused an increase in discharge power, and with the increase of voltage, the concentration of ozone and nitrogen oxide in the reactor increased. The degradation efficiency decreased from 98.1% to 80.2% when xylene concentration increased from 50 ppm to 550 ppm at 4kV. And with the increase of residence time from 0.301s to 1s, the degradation efficiency increased from 78.5% to 98.6%. According to GC-MS analysis, the degradation products were ethyl acetate and n-hexylmethylamine at 4kv. And the main intermediates are 2,4-2-tert-butylphenol, 2-aminopentane, 2-methyl-5 - (2-aminopropyl) - phenol and propionamide at 1.5kV.

scholarly journals Ultrasonic Preparation of PN For The Photodegradation of 17ß-Estradiol In Water And Biotoxicity Assessment Of E2 After Degradation

2021 ◽  
Author(s):  
Kun Meng ◽  
Ke-Fu Zhou ◽  
Nhat-Thien Nguyen ◽  
Bor-Yann Chen ◽  
Min Long ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solutions ◽  
Energy Dispersive Spectrometer ◽  
Degradation Efficiency ◽  
X Ray Diffraction ◽  
Force Microscopy ◽  
Synergistic Interactions ◽  
Atomic Force ◽  
Weight Content ◽  
Transmission Electron

Abstract This study prepared a novel Phosphorene (PN) and load it onto TiO2 to fabricated PN-TiO2, to effectively photo degrade the hydrophobic environmental hormone 17ß-estradiol in aqueous solutions. First, the corresponding characterization of prepared materials was implemented by myriads of methods (e.g, atomic force microscopy), transmission electron microscopy, scanning electron microscopy, energy dispersive spectrometer, X-ray diffraction and Raman spectroscopy. Next, the effect of the PN on the degradation efficiency was systematically investigated. Apparently, the doping of TiO2 by PN significantly enhanced its photocatalytic and adsorption properties with the addition of PN, compared to that in the absence of TiO2. That is the addition improved the adsorption capability of the composite. The optimal PN weight content was found to be 0.5%. However, the photo degradation efficiency gradually decreased when the PN content increased further. This optimal PN content directly suggested synergistic interactions upon the photo degrading efficiency. Compare to other PN-based photocatalysts mentioned in literature, this PN-based material owned striking advantages, such as higher energy efficiency, greater remove capacity, and superior cost-effectiveness. Further, biotoxicity of the water after treatment decreased was evident by observing the development of zebrafish embryos. In conclusion, the prepared PN-based materials exhibited promising photocatalytic capabilities for removal and biotoxicity reduction of 17ß-estradiol in aqueous solutions.

scholarly journals Degradation of lignin by Bacillus altitudinis SL7 isolated from pulp and paper mill effluent

2021 ◽  
Author(s):  
Sanam Islam Khan ◽  
Asaf Zarin ◽  
Safia Ahmed ◽  
Fariha Hasan ◽  
Ali Osman Belduz ◽  
...  
Keyword(s):  
Lignin Degradation ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Degradation Efficiency ◽  
Heterogeneous Structure ◽  
Pulp And Paper Mill ◽  
Bacillus Altitudinis ◽  
Paper Mill Effluent ◽  
Structure Degradation ◽  
Degrading Bacteria

Abstract Lignin is a major by-product of pulp and paper industries, which is resistant to depolymerization due to its heterogeneous structure. Degradation of lignin can be achieved by the use of potential lignin-degrading bacteria. The current study was designed to evaluate the degradation efficiency of newly isolated Bacillus altitudinis SL7 from pulp and paper mill effluent. The degradation efficiency of B. altitudinis SL7 was determined by color reduction, r lignin contents, and ligninolytic activity from degradation medium supplemented with alkali lignin (3 g/L). B. altitudinis SL7 reduced color and lignin contents by 26 and 44%, respectively, on 5th day of the incubation, as evident from the maximum laccase activity. Optimum degradation was observed at 40 °C and pH 8.0. FT-IR spectroscopy and GC-MS analysis confirmed lignin degradation by emergence of the new peaks and identification of low molecular weight compounds in treated samples. The identified compounds such as vanillin, 2-methyoxyhenol, 3-methyl phenol, oxalic acid and ferulic acid suggested the degradation of coniferyl and sinapyl groups of lignin. Degradation efficiency of B. altitudinis SL7 towards high lignin concentration under alkaline pH indicated the potential application of this isolate in biological treatment of the lignin-containing effluents.

Ultrathin frozen sections of yeast without aldehyde prefixation

1978 ◽  
Vol 36 (2) ◽  
pp. 58-59
Author(s):  
K. J. Böhm ◽  
a. E. Unger
Keyword(s):  
Aqueous Solutions ◽  
Biological Material ◽  
Yeast Cells ◽  
Frozen Sections ◽  
Good Preservation ◽  
Ultrathin Frozen Sections

During the last years it was shown that also by means of cryo-ultra-microtomy a good preservation of substructural details of biological material was possible. However the specimen generally was prefixed in these cases with aldehydes.Preparing ultrathin frozen sections of chemically non-prefixed material commonly was linked up to considerable technical and manual expense and the results were not always satisfying. Furthermore, it seems to be impossible to carry out cytochemical investigations by means of treating sections of unfixed biological material with aqueous solutions.We therefore tried to overcome these difficulties by preparing yeast cells (S. cerevisiae) in the following manner:

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

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