Development of a percarbonate-enhanced Vacuum UV process for simultaneous fluoroquinolone antibiotics removal and fecal bacteria inactivation under a continuous flow mode of operation

2021 ◽  
pp. 134064
Author(s):  
Samira Mohammadi ◽  
Gholamreza Moussavi ◽  
Kamyar Yaghmaeian ◽  
Stefanos Giannakis
Keyword(s):  
Continuous Flow ◽  
Flow Mode ◽  
Fecal Bacteria ◽  
Fluoroquinolone Antibiotics ◽  
Bacteria Inactivation ◽  
Mode Of Operation ◽  
Vacuum Uv

scholarly journals Fiberoptic-Coupled Spectrofluorometer with Array Detection as a Process Analytical Chemistry Tool for Continuous Flow Monitoring of Fluoroquinolone Antibiotics

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Nader Shokoufi ◽  
Maryam Vosough ◽  
Mona Rahimzadegan-Asl ◽  
Atefeh Abbasi-Ahd ◽  
Mahsa Khatibeghdami
Keyword(s):  
Analytical Chemistry ◽  
Optical Fiber ◽  
Continuous Flow ◽  
Array Detector ◽  
Flow Mode ◽  
Flow Monitoring ◽  
Fluoroquinolone Antibiotics ◽  
Array Detection ◽  
Fluorescence Spectrometer

Nowadays, there is an increasing need for sensitive real-time measurements of various analytes and monitoring of industrial products and environmental processes. Herein, we describe a fluorescence spectrometer in continuous flow mode in which the sample is fed to the flow cell using a peristaltic pump. The excitation beam is introduced to the sample chamber by an optical fiber. The fluorescence emitted upon excitation is collected at the right angle using another optical fiber and then transmitted to the fluorescence spectrometer which utilizes an array detector. The array detection, as a key factor in process analytical chemistry, made the fluorescence spectrometer suited for multiwavelength detection of the fluorescence spectrum of the analytes. After optimization of the experimental parameters, the system has been successfully employed for sensitive determination of four fluoroquinolone antibiotics such as ciprofloxacin, ofloxacin, levofloxacin, and moxifloxacin. The linear dynamic ranges of four fluoroquinolones were between 0.25 and 20 μg·mL−1, and the detection limit of the method for ciprofloxacin, ofloxacin, levofloxacin, and moxifloxacin were 81, 36, 35, and 93 ng·mL−1, respectively. Finally, the proposed system is carried out for determination of fluoroquinolones in some pharmaceutical formulations.

Kinetic assessment of antibiotic resistant bacteria inactivation by solar photo-Fenton in batch and continuous flow mode for wastewater reuse

2019 ◽  
Vol 159 ◽  
pp. 184-191 ◽  
Author(s):  
I. De la Obra Jiménez ◽  
J.L. Casas López ◽  
G. Rivas Ibáñez ◽  
B. Esteban García ◽  
J.A. Sánchez Pérez
Keyword(s):  
Continuous Flow ◽  
Wastewater Reuse ◽  
Resistant Bacteria ◽  
Flow Mode ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Bacteria Inactivation ◽  
Kinetic Assessment

Size controlled synthesis of semiconductor nanocrystals in a continuous-flow mode microcapillary reactor

2009 ◽  
Vol 52 (1-3) ◽  
pp. 15-18 ◽  
Author(s):  
L. B. He ◽  
B. Xie ◽  
F. Q. Song ◽  
C. H. Xu ◽  
J. F. Zhou ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Semiconductor Nanocrystals ◽  
Flow Mode ◽  
Controlled Synthesis ◽  
Size Controlled

Use of iron ore tailing from tailing dam as catalyst in a fenton-like process for methylene blue oxidation in continuous flow mode

Chemosphere ◽  
2019 ◽  
Vol 219 ◽  
pp. 328-334 ◽  
Author(s):  
Victor Augusto Araújo de Freitas ◽  
Samuel Moura Breder ◽  
Flávia Paulucci Cianga Silvas ◽  
Patrícia Radino Rouse ◽  
Luiz Carlos Alves de Oliveira
Keyword(s):  
Methylene Blue ◽  
Continuous Flow ◽  
Iron Ore ◽  
Flow Mode ◽  
Tailing Dam ◽  
Iron Ore Tailing

Tube-In-Tube Reactor as a Useful Tool for Homo- and Heterogeneous Olefin Metathesis under Continuous Flow Mode

ChemSusChem ◽  
2013 ◽  
Vol 7 (2) ◽  
pp. 536-542 ◽  
Author(s):  
Krzysztof Skowerski ◽  
Stefan J. Czarnocki ◽  
Paweł Knapkiewicz
Keyword(s):  
Olefin Metathesis ◽  
Continuous Flow ◽  
Flow Mode ◽  
Tube Reactor

Different Types of Microbial Fuel Cell (MFC) Systems for Simultaneous Electricity Generation and Pollutant Removal

2015 ◽  
Vol 74 (3) ◽  
Author(s):  
S. M. Zain ◽  
N. L. Ching ◽  
S. Jusoh ◽  
S. Y. Yunus
Keyword(s):  
Nitrogen Removal ◽  
Continuous Flow ◽  
Electricity Generation ◽  
Pollutant Removal ◽  
Flow Mode ◽  
Oxidizing Agent ◽  
Batch Mode ◽  
Carbon And Nitrogen ◽  
Different Types ◽  
The Relationship

The aim of this study is to identify the relationship between the rate of electricity generation and the rate of carbon and nitrogen removal from wastewater using different MFC processes.  Determining whether the generation of electricity using MFC process could be related to the rate of pollutant removal from wastewater is noteworthy. Three types of MFC process configurations include the batch mode (SS), a continuous flow of influent with ferricyanide (PF) as the oxidizing agent and a continuous flow of influent with oxygen (PU) as the oxidizing agent. The highest quantity of electricity generation was achieved using the continuous flow mode with ferricyanide (0.833 V), followed by the continuous flow mode with oxygen (0.589 V) and the batch mode (0.352 V). The highest efficiency of carbon removal is also achieved by the continuous flow mode with ferricyanide (87%), followed by the continuous flow mode with oxygen (51%) and the batch mode (46%). Moreover, the continuous flow mode with ferricyanide produced the highest efficiency for nitrogen removal (63%), followed by the continuous flow mode with oxygen (54%) and the batch mode (27%).

scholarly journals A Steady State Continuous Flow Chamber for the Study of Daytime and Night time Chemistry under Atmospherically Relevant NO levels

2018 ◽  
Author(s):  
Xuan Zhang ◽  
John Ortega ◽  
Yuanlong Huang ◽  
Stephen Shertz ◽  
Geoffrey S. Tyndall ◽  
...  
Keyword(s):  
Steady State ◽  
Atmospheric Chemistry ◽  
Continuous Flow ◽  
Anthropogenic Activities ◽  
The United States ◽  
Flow Chamber ◽  
Flow Mode ◽  
Peroxy Radicals ◽  
Night Time ◽  
Atmospheric Processes

Abstract. Experiments performed in laboratory chambers have contributed significantly to the understanding of the fundamental kinetics and mechanisms of the chemical reactions occurring in the atmosphere. Two chemical regimes, classified as high-NO versus zero-NO conditions, have been extensively studied in previous chamber experiments. Results derived from these two chemical scenarios are widely parameterized in chemical transport models to represent key atmospheric processes in urban and pristine environments. As the anthropogenic NOx emissions in the United States have decreased remarkably in the past few decades, the classic high-NO and zero-NO conditions are no longer applicable to many regions that are constantly impacted by both polluted and background air masses. We present here the development and characterization of the NCAR Atmospheric Simulation Chamber, which is operated in steady state continuous flow mode for the study of atmospheric chemistry under intermediate NO conditions. This particular chemical regime is characterized by constant sub-ppb levels of NO and can be created in the chamber by precise control of the inflow NO concentration and the ratio of chamber mixing to residence timescales. Over the range of conditions achievable in the chamber, the lifetime of peroxy radicals (RO2), a key intermediate from the atmospheric degradation of volatile organic compounds (VOCs), can be extended to several minutes, and a diverse array of reaction pathways, including unimolecular pathways and bimolecular reactions with NO and HO2, can thus be explored. Characterization experiments under photolytic and dark conditions were performed and, in conjunction with model predictions, provide a basis for interpretation of prevailing atmospheric processes in environments with intertwined biogenic and anthropogenic activities. We demonstrate the proof of concept of the steady state continuous flow chamber operation through measurements of major first-generation products, methacrolein (MACR) and methyl vinyl ketone (MVK), from OH- and NO3-initiated oxidation of isoprene.

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