scholarly journals Nonwoven Bio-Based Membranes for Removal of Micropollutants from Aqueous Water

2021 ◽  
Vol 57 (4) ◽  
pp. 34-44
Author(s):  
Ecaterina Matei ◽  
Cristina Ileana Covaliu ◽  
George Coman ◽  
Mihai Negroiu ◽  
Maria Rapa ◽  
...  
Keyword(s):  
Electrospinning Process ◽  
Attenuated Total Reflectance ◽  
Scanning Calorimetry ◽  
Chemical Methods ◽  
Physical Chemical ◽  
Activated Coal ◽  
Solid Suspension ◽  
Electrospun Membranes ◽  
Ft Ir

The aim of this paper is to obtain two types of bio-based membranes by electrospinning process: one based on polylactic acid (PLA), and PLA/polyhydroxybutyrate (PHB), and the second by coating the PLA/PHB membrane with chitosan (CS) and CS/activated coal (AC), respectively for removal of micropollutants from aqueous water. The designed bio-based electrospun membranes were analyzed through scanning electron microscopy (SEM), attenuated total reflectance (ATR) - Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), the removal of solid suspension and Pb (II) from aqueous water. The quality of filtrates was evaluated by physical-chemical methods, while the retaining of Pb (II) from wastewaters was reported.

scholarly journals Optimization of the Production Process and Product Quality of Titanate Nanotube–Drug Composites

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1406 ◽  
Author(s):  
Yasmin Ranjous ◽  
Géza Regdon ◽  
Klára Pintye-Hódi ◽  
Tamás Varga ◽  
Imre Szenti ◽  
...  
Keyword(s):  
Scanning Calorimetry ◽  
Good Solubility ◽  
Composite Formation ◽  
Alternative Materials ◽  
High Volatility ◽  
Ft Ir ◽  
Fast Disintegrating Tablets ◽  
As Solubility ◽  
Properties Of Composites

Recently, there has been an increasing interest in the application of nanotubular structures for drug delivery. There are several promising results with carbon nanotubes; however, in light of some toxicity issues, the search for alternative materials has come into focus. The objective of the present study was to investigate the influence of the applied solvent on the composite formation of titanate nanotubes (TNTs) with various drugs in order to improve their pharmacokinetics, such as solubility, stability, and bioavailability. Composites were formed by the dissolution of atenolol (ATN) and hydrochlorothiazide (HCT) in ethanol, methanol, 0.01 M hydrochloric acid or in ethanol, 1M sodium hydroxide, dimethylformamide (DMF), dimethyl sulfoxide (DMSO), respectively, and then they were mixed with a suspension of TNTs under sonication for 30 min and vacuum-dried for 24 h. The structural properties of composites were characterized by SEM, TEM, FT-IR, differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, and optical contact angle (OCA) measurements. Drug release was determined from the fast disintegrating tablets using a dissolution tester coupled with a UV–Vis spectrometer. The results revealed that not only the good solubility of the drug in the applied solvent, but also the high volatility of the solvent, is necessary for an optimal composite-formation process.

scholarly journals Biocompatibility studies of polyurethane electrospun membranes based on arginine as chain extender

2021 ◽  
Vol 32 (9) ◽  
Author(s):  
Georgina Alejandra Venegas-Cervera ◽  
Andrés Iván Oliva ◽  
Alejandro Avila-Ortega ◽  
José Manuel Cervantes-Uc ◽  
Leydi Maribel Carrillo-Cocom ◽  
...  
Keyword(s):  
Fourier Transforms ◽  
Cell Attachment ◽  
Human Fibroblasts ◽  
Gel Permeation Chromatography ◽  
Electrospinning Process ◽  
Chain Extender ◽  
Cellular Interaction ◽  
Scanning Calorimetry ◽  
Polyurethane Membranes ◽  
Electrospun Membranes

AbstractElectrospun polymers are an example of multi-functional biomaterials that improve the material-cellular interaction and aimed at enhancing wound healing. The main objective of this work is to fabricate electrospun polyurethane membranes using arginine as chain extender (PUUR) in order to test the fibroblasts affinity and adhesion on the material and the polymer toxicity. Polyurethane membranes were prepared in two steps: (i) the polyurethane synthesis, and ii) the electrospinning process. The membranes were characterized by scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy, gel permeation chromatography, and differential scanning calorimetry techniques. The evaluation of PUUR as a scaffolding biomaterial for growing and developing of cells on the material was realized by LIVE/DEAD staining. The results show that the fluorescent surface area of human fibroblasts (hFB), was greater in control dense membranes made from Tecoflex than in electrospun and dense PUUR. From SEM analysis, the electrospun membranes show relatively uniform attachment of cells with a well-spread shape, while Tecoflex dense membranes show a non-proliferating round shape, which is attributed to the fiber’s structure in electrospun membranes. The cell morphology and the cell attachment assay results reveal the well spreading of hFB cells on the surface of electrospun PUUR membranes which indicates a good response related to cell adhesion.

Physical-Chemical Experimental Study for FGD Wastewater of Coal-Fired Power Plant

2012 ◽  
Vol 610-613 ◽  
pp. 1778-1783
Author(s):  
Lian Qing Yin ◽  
Shan Shan Zhang ◽  
Peng Kang ◽  
Hao Ning Zhao
Keyword(s):  
Experimental Study ◽  
Power Plant ◽  
Suspended Solids ◽  
Inorganic Salts ◽  
Chemical Methods ◽  
Emission Standards ◽  
Physical Chemical ◽  
Harmful Substances ◽  
Physical And Chemical

The volume of FGD wastewater of coal-fired power plant is very large, and it contains a large number of inorganic salts, suspended solids and heavy metals, the directly discharge of wastewater will cause a lot of pollution to the environment. This paper selects the FGD wastewater of Baoding power plant as a research object, it is taken experimental study by physical and chemical methods, the harmful substances in the wastewater are removed, so the quality of FGD wastewater achieves the national emission standards of sewage.

scholarly journals Attempts to Upcycle PET Wastes into Bio-based Long-lasting Insulating Materials

2019 ◽  
Vol 70 (7) ◽  
pp. 2301-2307
Author(s):  
Monica-Mirela Duldner ◽  
Emeric Bartha ◽  
Stanca Capitanu ◽  
Simona Nica ◽  
Alina Elena Coman ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Polyurethane Foams ◽  
Chemical Processes ◽  
Chemical Methods ◽  
Insulating Materials ◽  
Chemical Structures ◽  
Physical Chemical ◽  
Ft Ir ◽  
Organic Catalyst ◽  
Ft Ir Spectroscopy

Following the green chemistry principles, three series of polyols with tailored chemical structures were obtained from PET wastes degradation via glycolysis and/or aminolysis and subsequent esterification-transesterification and/or amidation reactions, using an organic catalyst. As cleaving agents there were used various mixtures of renewable or potentially renewable reagents, selected from those that can be obtained from biomass by already applied or investigated and eventually patented biochemical and/or chemical processes. The polyols were characterized by physical-chemical methods, 1H-NMR, 13C-NMR and FT-IR Spectroscopy, and tested in the synthesis of rigid polyurethane foams, showing appropriate properties for spray foams formation and leading to materials with properties similar to conventional spray foams.

scholarly journals Preparation and Characterization of PVA/Zinc Acetate/ Boron Composite Fibers

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Ibrahim Uslu ◽  
Burcu Başer ◽  
Ahmet Yaylı ◽  
Mehmet Levent Aksu
Keyword(s):  
Zinc Acetate ◽  
Large Scale ◽  
Aluminum Foil ◽  
Electrospinning Process ◽  
Polymer Fibers ◽  
Zno Films ◽  
Composite Polymer ◽  
Scanning Calorimetry ◽  
Electrospinning Technique ◽  
Ft Ir

Abstract The objective of this work was to synthesize boron incorporated PVA/Zinc acetate nano precursor composite polymer fibers using electrospinning technique. Produced fibers, are useful reagents in organic synthesis of zinc oxide nano structures which have gained wide interest because of their potential applications in the fabrication of microelectronic devices. Boron incorporated PVA/Zinc acetate not only improve the electrical properties of ZnO films but also has an influence on the crystal structure of ZnO films. The fibers were measured and characterized by conductiometer (with four-point probe), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The formation of boron incorporated PVA/Zinc acetate hybrid polymer was confirmed by FT-IR spectra. SEM micrographs clearly reveal that there are random-growth oriented fibers on aluminum foil with diameters ranging from 0.5 to 1 μm. According to the TGA analysis decomposition of zinc acetate from the PVA chain was observed around 273 °C, 368 °C and 447 °C. Boron incorporated PVA/Zinc acetate nano composite polymer fibers have been successfully synthesized for the first time using electrospinning technique and characterized in detail as precursor material for ZnO. Electrospinning process has been a widely used, simple and versatile method and in future may be used for large-scale preparation of nanofibers of ZnO.

Slotted bone point from Tłokowo – rewritten story of a unique artefact from Mesolithic Poland

2020 ◽  
Vol 95 (2) ◽  
pp. 334-349
Author(s):  
Grzegorz Osipowicz ◽  
Justyna Orłowska ◽  
Mariusz Bosiak ◽  
Mikael A. Manninen ◽  
Piotr Targowski ◽  
...  
Keyword(s):  
Current Knowledge ◽  
Interdisciplinary Studies ◽  
Gas Chromatography Mass Spectrometry ◽  
Attenuated Total Reflectance ◽  
Physical Chemical ◽  
North Eastern ◽  
Chemical Studies ◽  
Ft Ir ◽  
Ir Analysis ◽  
Technology Of Production

AbstractThe article describes the results of the interdisciplinary studies of a unique bone slotted point from Tłokowo, north-eastern Poland. The artefact was discovered in 1989, and indirect dating suggested an Early Mesolithic date. In this article we present the results of direct radiocarbon dating of the point, which shows that it is almost 2000 years younger than previously suggested. In addition, physical-chemical studies of the adhesive used to mount the flint inserts inside the point were conducted. The results of gas chromatography mass spectrometry (GC-MS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FT-IR) analysis indicate that the adhesive is birch tar. Finally, the article presents the results of detailed traceological studies that allow interpretation of the technology of production and possible function of the point. For the analysis, as well as various types of microscopes, optical coherence tomography (OCT) was used. In the discussion the results of all the analyses are considered alongside our current knowledge of this type of Mesolithic points in Europe.

scholarly journals Advances in adulteration and authenticity testing of turmeric (Curcuma longa L.)

1970 ◽  
pp. 96-105
Author(s):  
B Sasikumar
Keyword(s):  
Curcuma Longa ◽  
Acid Orange 7 ◽  
Chemical Methods ◽  
Supply Chain System ◽  
The Public ◽  
Diagnostic Kits ◽  
Physical Chemical ◽  
Synthetic Colorants ◽  
Unorganized Sector

Synthetic colorants such as metanil yellow, lead chromate, Acid orange 7, Sudan red; rhizomes of related Curcuma sp. besides spent turmeric, starch, chalk and yellow soapstone are the main adulterants in traded turmeric while synthetic curcumin is an adulterant of natural curcumin. Both branded products as well as the produce from the unorganized sector are found adulterated. The adulterants, added either to increase the bulk, improve the colour and appearance or enhance the profit margin, often result in corroding the biological efficacy of the commodity and eroding the public impression besides posing health risks to the consumers. Various physical, chemical and PCR based methods are available to detect the adulterants in traded turmeric. While chemical methods are suited to detect the synthetic adulterants and spent turmeric, DNA based methods are the best options for detecting the biological adulterants (except spent turmeric) in the commodity. Along with adopting a supply chain system and quality linked pricing in turmeric trade, commercial adulteration diagnostic kits, if they can be developed and deployed, will be a very convenient way to ensure the quality of the traded produce.

Study on the Stability of Insect Wax during Storage Period

2011 ◽  
Vol 418-420 ◽  
pp. 481-489
Author(s):  
Kun Li ◽  
Ru Guo Zhang ◽  
Hong Zhang ◽  
Hua Zheng ◽  
Kun Li ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Chemical Constituents ◽  
Storage Period ◽  
Functional Materials ◽  
Scanning Calorimetry ◽  
Influence Of Temperature ◽  
Physical Chemical ◽  
Influence Of Temperature On ◽  
The Stability

For the wide application of insect wax, it was studied on its thermal properties under different conditions in which the wax was stored at cold, dark, indoor and sunshine environment. Differential scanning calorimetry (DSC) was selected to achieve thermal parameters and reveal the influence of temperature on the stability of the wax. The result showed that within 20 months of natural storage, it was significant influence on the melting enthalpy of Hunan insect wax, the melting point of Sichuan insect wax and the melting peak of Sichuan insect wax with the Sig values were 0.013, 0.009 and 0.000. And the quality of wax was characterized by IR, XRD and physical-chemical indexes. The results showed that within 20 months, it was slightly changed in the crystallinity and chemical constituents. Therefore, the wax with good stability can be used for medicine, food, functional materials and other industrial purposes safely.

scholarly journals Polylactic Acid/Cellulose Fibres Based Composites for Food Packaging Applications

2017 ◽  
Vol 54 (4) ◽  
pp. 673-677 ◽  
Author(s):  
Elisabeta Elena Popa ◽  
Maria Rapa ◽  
Ovidiu Popa ◽  
Gabriel Mustatea ◽  
Vlad Ioan Popa ◽  
...  
Keyword(s):  
Chemical Structure ◽  
Food Packaging ◽  
Attenuated Total Reflectance ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Cellulose Fibres ◽  
Total Reflectance ◽  
Ft Ir ◽  
Ir Analysis ◽  
And Migration

PLA-based composites containing CF in the range 0 to 10 wt. % were prepared by melt mixing technique. The prepared composites were investigated in terms of processability, chemical structure (by Attenuated total reflectance - Fourier Transform Infrared - ATR-FT-IR analysis), thermal (Differential Scanning Calorimetry - DSC), optical properties (using UV-Vis spectrometry), barrier and migration in distilled water. Also, the behaviour of PLA based composites at sterilization was performed by examination the changes in their chemical structure. This study shows the feasibility of improving of PLA properties by using cellulose fibres, designed for flexible food packaging.

scholarly journals Layer-By-Layer Assembled, Amphiphilic And Antibacterial Hybrid Electrospun Mat Made From Polypropylene And Chitosan Fibers

2021 ◽  
Author(s):  
Gokhan Acik ◽  
Burcu Acik ◽  
E. Agel
Keyword(s):  
Antibacterial Activity ◽  
Sem Analysis ◽  
Electrospinning Process ◽  
Layer By Layer ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
E Coli ◽  
Ft Ir ◽  
Dsc Analyses ◽  
First Time

Abstract In this study, hybrid fiber mat (HFPP-CS) consisting of both chlorinated polypropylene and chitosan fibers (FPP-Cl and FCS) is obtained by assembling layer-by-layer (LBL) for the first time using electrospinning process. Morphological, wettability, structural and thermal properties of HFPP-CS are investigated in detail by Scanning electron microscopy (SEM), water contact angle (WCA) measurement, fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) analyses, respectively, comparing with FPP-Cl and FCS. Furthermore, the antibacterial activity of all samples was evaluated against to gram positive Staphylococcus aureus (S. aureus) and gram negative Escherichia coli (E. coli) bacteria. SEM analysis proves to HFPP-CS has a circular and smooth morphology and also comprises of microscale FPP-Cl and nanoscale FCS layers. The incorporation of nano-FCS layer on micro-FPP-Cl layer leads to diminution in the hydrophobicity, but enhancement in the thermostability and glass transition temperature of the resulting fiber mat. The antibacterial activity results show that HFPP-CS has inhibition effect against to S. aureus and E. coli. In general, it is anticipated that the prepared amphiphilic and antibacterial HFPP-CS can be employed as potential biomaterial for a variety of bioengineering applications.

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