scholarly journals Evaluation of activated composite membranes for the facilitated transport of phenol

e-Polymers ◽  
2018 ◽  
Vol 18 (4) ◽  
pp. 313-319 ◽  
Author(s):  
Irma Pérez-Silva ◽  
Carlos A. Galán-Vidal ◽  
María T. Ramírez-Silva ◽  
Giaan A. Álvarez Romero ◽  
Ma. Elena Páez-Hernández
Keyword(s):  
Composite Membranes ◽  
Synthetic Wastewater ◽  
Dense Layer ◽  
Organic Species ◽  
Long Period ◽  
Cyanex 923 ◽  
Feed Phase ◽  
Complex Solutions ◽  
Rate Of Extraction ◽  
Potential Use

AbstractIn this work the results on the first use of an activated composite membrane (ACM) containing Cyanex 923 for the extraction and transport of phenol are presented. A new dense layer-ACM configuration constituted by piperazine showed better stability than that prepared with 1,3-phenylenediamine. The effects of several parameters on the transport of phenol such as feed phase pH, carrier concentration and stripping phase composition were evaluated. The performance of the membrane was also evaluated during continuous additions of phenol and for a long period of time, observing the same rate of extraction and reextraction. Moreover, phenol transport was evaluated starting from synthetic wastewater of resin production plants type. The results exhibit the potential use of ACMs in the elimination and transport of organic species, even when analyte is initially found in complex solutions.

The growth of mica polytypes as studied by conventional and high-resolution TEM

1983 ◽  
Vol 41 ◽  
pp. 174-177
Author(s):  
A. Baronnet ◽  
M. Amouric
Keyword(s):  
Water Pressure ◽  
Point Of View ◽  
Temperature Fields ◽  
Natural Occurrence ◽  
Growth Mechanisms ◽  
Long Period ◽  
High Resolution Tem ◽  
Layer Stacking ◽  
Experimental Works ◽  
Potential Use

The origin of mica polytypes has long been a challenging problem for crystal- lographers, mineralogists and petrologists. From the petrological point of view, interest in this field arose from the potential use of layer stacking data to furnish further informations about equilibrium and/or kinetic conditions prevailing during the crystallization of the widespread mica-bearing rocks. From the compilation of previous experimental works dealing with the occurrence domains of the various mica "polymorphs" (1Mr, 1M, 2M1, 2M2 and 3T) within water-pressure vs temperature fields, it became clear that most of these modifications should be considered as metastable for a fixed mica species. Furthermore, the natural occurrence of long-period (or complex) polytypes could not be accounted for by phase considerations. This highlighted the need of a more detailed kinetic approach of the problem and, in particular, of the role growth mechanisms of basal faces could play in this crystallographic phenomenon.

Use of Scrap Tire Chips in Asphaltic Membrane

1996 ◽  
Vol 1530 (1) ◽  
pp. 59-63
Author(s):  
Kamyar C. Mahboub ◽  
Phillip R. Massie
Keyword(s):  
Cost Effective ◽  
Waste Materials ◽  
Scrap Tire ◽  
Research Project ◽  
Moisture Barrier ◽  
Waste Tires ◽  
Long Period ◽  
Tire Chips ◽  
Potential Use

Findings of a study involving the use of scrap tire chips in an asphaltic membrane are reported. The research project was designed with two objectives in mind: investigate the effectiveness of an asphaltic membrane on top of a subgrade for maintaining moisture equilibrium in subgrade and study the potential use of scrap tire chips in asphaltic membranes. The effectiveness of the membrane as a moisture barrier needs to be evaluated over a long period of time. However, the method proved to be a cost-effective way of recycling waste tires in pavements. It is hoped that this study will contribute to various efforts in the area of cost-effective and sound use of waste materials in construction.

A Study on Acidification and Intercalation of Illite Clay Minerals and their Potential Use as a Filler in SPEEK Composite Membranes

2018 ◽  
Vol 762 ◽  
pp. 186-191
Author(s):  
Anna Trubača-Boginska ◽  
Rūta Ādiņa ◽  
Guntars Vaivars ◽  
Janis Švirksts
Keyword(s):  
Proton Exchange Membrane ◽  
Composite Membranes ◽  
Proton Exchange ◽  
X Ray ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Conductivity Water ◽  
Ether Ketone ◽  
Exchange Membrane ◽  
Potential Use

The acidification and intercalation of illite containing clays were studied for potential use as fillers for sulphonated poly (ether ether ketone) (SPEEK) composite membrane preparation and future proton exchange membrane fuel cells application. The acidification and dimethyl sulfoxide (DMSO) intercalation of illite clays have been studied by powder X-ray diffractometry, X-ray fluorescence spectrometry, and thermogravimetric analysis. SPEEK composite membranes were made with 1, 3 and 5% purified, acidified, DMSO intercalated clay fillers. SPEEK/clay composite membranes were characterized by proton conductivity, water uptake, and mechanical strength.

scholarly journals Tannin-Based Hybrid Materials and Their Applications: A Review

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4910
Author(s):  
Ann-Kathrin Koopmann ◽  
Christian Schuster ◽  
Jorge Torres-Rodríguez ◽  
Stefan Kain ◽  
Heidi Pertl-Obermeyer ◽  
...  
Keyword(s):  
Food Packaging ◽  
Building Blocks ◽  
High Reactivity ◽  
Comprehensive Overview ◽  
Chemical Mechanisms ◽  
Organic Species ◽  
Current State ◽  
State Of Research ◽  
In Virtue Of ◽  
Potential Use

Tannins are eco-friendly, bio-sourced, natural, and highly reactive polyphenols. In the past decades, the understanding of their versatile properties has grown substantially alongside a continuously broadening of the tannins’ application scope. In particular, recently, tannins have been increasingly investigated for their interaction with other species in order to obtain tannin-based hybrid systems that feature advanced and/or novel properties. Furthermore, in virtue of the tannins’ chemistry and their high reactivity, they either physicochemically or physically interact with a wide variety of different compounds, including metals and ceramics, as well as a number of organic species. Such hybrid or hybrid-like systems allow the preparation of various advanced nanomaterials, featuring improved performances compared to the current ones. Consequently, these diverse-shaped materials have potential use in wastewater treatment or catalysis, as well as in some novel fields such as UV-shielding, functional food packaging, and biomedicine. Since these kinds of tannin-based hybrids represent an emerging field, thus far no comprehensive overview concerning their potential as functional chemical building blocks is available. Hence, this review aims to provide a structured summary of the current state of research regarding tannin-based hybrids, detailed findings on the chemical mechanisms as well as their fields of application.

One-pot fabrication of cellulose-collagen fibrous networks for potential use as wound dressing: From characterization to first evaluation of cytocompatibility

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 2501-2511
Author(s):  
Wei Xu ◽  
Die Zhang ◽  
Jie Cai ◽  
Shui-Yuan Cheng ◽  
Wen-Ping Ding
Keyword(s):  
Wound Dressing ◽  
Composite Membranes ◽  
Gravimetric Analysis ◽  
Self Healing ◽  
One Pot ◽  
Collagen Hydrolysate ◽  
Element Analysis ◽  
Good Thermal Stability ◽  
Nanofibrous Membranes ◽  
Potential Use

Biomedical researchers have been attempting to construct a wound dressing with the structure and function of a bionic natural extracellular matrix. This dressing would provide a comfortable environment for wound self-healing. In this study, cellulose-collagen fibrous networks were easily fabricated via the one-pot method using genipin in situ crosslinking collagen hydrolysate in cellulose nanofibrous membranes made by electrospinning cellulose acetate and subsequent deacetylation. The morphology, properties, and successful entrapment of collagen in the cellulose fibrous dressings were validated by scanning electron microscopy, element analysis, Fourier transform infrared spectroscopy, X-ray diffraction, water-swelling test, and thermal gravimetric analysis. The functional cellulose nanofiber-based composite membranes exhibited a network structure, good thermal stability, and acceptable water resistance. Human epidermal cells seeded on the composite nanofibrous membranes presented favorable growth, indicating good cytocompatibility and suitability of the dressing to the wound. Therefore, these novel cellulose-collagen fibrous networks may have potential use in biomedical applications.

scholarly journals Antimicrobial Activity of Oleanolic and Ursolic Acids: An Update

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Jéssica A. Jesus ◽  
João Henrique G. Lago ◽  
Márcia D. Laurenti ◽  
Eduardo S. Yamamoto ◽  
Luiz Felipe D. Passero
Keyword(s):  
Antimicrobial Activity ◽  
Animal Health ◽  
Mechanisms Of Action ◽  
Human Pathogens ◽  
Future Perspectives ◽  
Pharmacological Activities ◽  
Long Period ◽  
Wide Range ◽  
Potential Use

Triterpenoids are the most representative group of phytochemicals, as they comprise more than 20,000 recognized molecules. These compounds are biosynthesized in plants via squalene cyclization, a C30hydrocarbon that is considered to be the precursor of all steroids. Due to their low hydrophilicity, triterpenes were considered to be inactive for a long period of time; however, evidence regarding their wide range of pharmacological activities is emerging, and elegant studies have highlighted these activities. Several triterpenic skeletons have been described, including some that have presented with pentacyclic features, such as oleanolic and ursolic acids. These compounds have displayed incontestable biological activity, such as antibacterial, antiviral, and antiprotozoal effects, which were not included in a single review until now. Thus, the present review investigates the potential use of these triterpenes against human pathogens, including their mechanisms of action, viain vivostudies, and the future perspectives about the use of compounds for human or even animal health are also discussed.

scholarly journals Synthesis and Evaluation of HSOD/PSF and SSOD/PSF Membranes for Removal of Phenol from Industrial Wastewater

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1253
Author(s):  
Rivoningo Ngobeni ◽  
Olawumi Sadare ◽  
Michael O. Daramola
Keyword(s):  
Mechanical Properties ◽  
Contact Angle ◽  
Composite Membranes ◽  
Synthetic Wastewater ◽  
Aquatic Life ◽  
Force Microscopy ◽  
Feed Pressure ◽  
Dead End ◽  
Study Results ◽  
Membrane Porosity

Phenol is regarded as a major pollutant, as the toxicity levels are in the range of 9–25 mg/L for aquatic life and humans. This study embedded silica sodalite (SSOD) and hydroxy sodalite (HSOD) nanoparticles into polysulfone (PSF) for enhancement of its physicochemical properties for treatment of phenol-containing wastewater. The pure polysulfone membranes and sodalite-infused membranes were synthesized via phase inversion. To check the surface morphology, surface hydrophilicity, surface functionality, surface roughness and measure the mechanical properties of the membranes, characterization techniques such as Scanning Electron Microscope (SEM), contact angle measurements, Fourier Transform Infrared, Atomic Force Microscopy (AFM) nanotensile tests were used, respectively. The morphology of the composite membranes showed incorporation of the sodalite crystals decreased the membrane porosity. The results obtained showed the highest contact angle of 83.81° for pure PSF as compared to that of the composite membranes. The composite membranes with 10 wt.% HSOD/PSF and 10 wt.% SSOD/PSF showed mechanical enhancement as indicated by a 20.96% and 19.69% increase in ultimate tensile strength, respectively compared to pure PSF. The performance evaluation of the membranes was done using a dead-end filtration cell at varied feed pressure. Synthetic phenol-containing wastewater was prepared by dissolving one gram of phenol crystals in 1 L of deionized water and used in this study. Results showed higher flux for sodalite infused membranes than pure PSF for both pure and phenol-containing water. However, pure PSF showed the highest phenol rejection of 93.55% as compared to 63.65% and 64.75% achieved by 10 wt.% HSOD/PSF and 10 wt.% SSOD/PSF, respectively. The two sodalite infused membranes have shown enhanced mechanical properties and permeability during treatment of phenol in synthetic wastewater.

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