Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Lu, Xiaoyun; Shah, Parag K.; Maruf, Sajjad H.; Ortiz, S.; Hoffard, Theresa; Pellegrino, John

doi:10.1002/app.41553

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…The FTIR spectra of the membranes after the MD process showed the appearance of new peaks in the range of 1500–1800 cm −1 ( Figure 12 ), which were not obtained for the tested oil. In this range, the carbonyl groups presented in aldehydes, ketones, esters, and carboxylic acids have a strong absorption [ 51 , 52 ]. There was also an increase in the broadband in the 3000–3600 cm −1 range characteristic of the hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Gryta

2021

Membranes

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The influence of oil emulsion presence in the water on the course of water desalination by membrane distillation was studied. The feed water was contaminated by oil collected from the bilge water. The impact of feed composition on the wetting resistance of hydrophobic polypropylene membranes was evaluated during long-term studies. Two types of the capillary membranes fabricated by thermally induced phase separation method were tested. It has been found that these membranes were non-wetted during the separation of NaCl solutions over a period of 500 h of modules exploitation. The addition of oil (5–100 mg/L) to the feed caused a progressive decline of the permeate flux up to 30%; however, the applied hydrophobic membranes retained their non-wettability for the consecutive 2400 h of the process operation. It was indicated that several compounds containing the carbonyl group were formed on the membranes surface during the process. These hydrophilic compounds facilitated the water adsorption on the surface of polypropylene which restricted the oil deposition on the membranes used.

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Section: Resultsmentioning

confidence: 99%

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Gryta

2021

Membranes

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“…Cross sectional analysis combined with Raman microscopy was used to perform an analysis of the degradation of polypropylene (PP) hollow fibre membranes used in microfiltration applications [41].…”

Section: Characterisation Of Polymer Membranes and Membrane Formationmentioning

confidence: 99%

State of the art review on membrane surface characterisation: Visualisation, verification and quantification of membrane properties

2018

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Many of the properties exhibited by separation membranes are due to interactions at the interface with their environment, including flux, rejection of solutes and surface fouling. As such when trying to understand how such interactions affect their function and when developing novel membranes with improved properties, a thorough understanding of their surface properties is essential. In this review paper we describe and discuss a number of instrumental techniques commonly used to characterize membrane surface, along with illustrative examples from the literature on membrane development and characterization. The techniques described include spectroscopic techniques, microscopic techniques and methods to measure the surface wettability and electrokinetic behaviour.

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“…Lu et al took a unique approach to study the degradation of hollow polypropylene (PP) fibers that are commonly used to construct microfiltration membranes in military water purification systems . Raman spectroscopy was used to collect spectra along the cross section of five PP fibers.…”

Section: Trace Evidencementioning

confidence: 99%

What can Raman spectroscopy do for criminalistics?

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Bueno

et al. 2015

J Raman Spectroscopy

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For decades Raman spectroscopy has been used as a specialized tool in a variety of fields. Forensic science is one discipline in particular that has greatly benefited from the application of Raman spectroscopic research. Here, studies using Raman spectroscopy for analyzing criminalistic evidence, including body fluids, human tissue, bones, gunshot residue, fibers, and hair, are reviewed. Many of these methods demonstrate the significance of incorporating chemometrics for data analysis to provide more reliable and quantitative results with associated errors. Currently, there are only a few branches of forensic science that use Raman spectroscopy in practice, despite its wide range of advantages. However, many more applications have been developed in the research setting and are presented here. These studies showcase the versatility and dependability of Raman spectroscopy, specifically for criminalistic purposes. The advantages of developing and transitioning these techniques to be used in practice are also discussed, including the tremendous benefits of portable instrumentation. Raman spectroscopy can easily become an established analytical technique for many criminalistics disciplines because it allows for obtaining real‐time, rapid, impartial, statistically confident results. Consequently, the improvements to forensic science as a whole will be revolutionary. Copyright © 2015 John Wiley & Sons, Ltd.

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Forensic analysis of degraded polypropylene hollow fibers utilized in microfiltration

Cited by 8 publications

References 30 publications

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

Resistance of Polypropylene Membrane to Oil Fouling during Membrane Distillation

State of the art review on membrane surface characterisation: Visualisation, verification and quantification of membrane properties

What can Raman spectroscopy do for criminalistics?

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