Nanocomposite films that were based on furcellaran (FUR) and nanofillers (carbon quantum dots (CQDs), maghemite nanoparticles (MAN), and graphene oxide (GO)) were obtained by the casting method. The microstructure, as well as the structural, physical, mechanical, antimicrobial, and antioxidant properties of the films was investigated. The incorporation of MAN and GO remarkably increased the tensile strength of furcellaran films. However, the water content, solubility, and elongation at break were significantly reduced by the addition of the nanofillers. Moreover, furcellaran films containing the nanofillers exhibited potent free radical scavenging ability. FUR films with CQDs showed an inhibitory effect on the growth of Staphylococcus aureus and Escherichia coli. The nanocomposite films were used to cover transparent glass containers to study the potential UV-blocking properties in an oil oxidation test and compare with tinted glass. The samples were irradiated for 30 min. with UV-B and then analyzed for oxidation markers (peroxide value, free fatty acids, malondialdehyde content, and degradation of carotenoids). The test showed that covering the transparent glass with MAN films was as effective in inhibiting the oxidation as the use of tinted glass, while the GO and CQDs films did not inhibit oxidation. It can be concluded that the active nanocomposite films can be used as a desirable material for food packaging.

• Keywords
• active properties, carbon quantum dots, furcellaran, graphene oxide, linseed oil preservation, maghemite nanoparticles, nanocomposite films,
• Publication type
• Journal Article MeSH

From the rediscovery of graphene in 2004, the interest in layered graphene analogs has been exponentially growing through various fields of science. Due to their unique properties, novel two-dimensional family of materials and especially transition metal dichalcogenides are promising for development of advanced materials of unprecedented functions. Progress in 2D materials synthesis paved the way for the studies on their hybridization with other materials to create functional composites, whose electronic, physical or chemical properties can be engineered for special applications. In this review we focused on recent progress in graphene-based and MoS2 hybrid nanostructures. We summarized and discussed various fabrication approaches and mentioned different 2D and 3D structures of composite materials with emphasis on their advances for electroanalytical chemistry. The major part of this review provides a comprehensive overview of the application of graphene-based materials and MoS2 composites in the fields of electrochemical sensors and biosensors.

• Keywords
• 2D materials, bioanalysis, biomarker, carbon, electrode,
• MeSH
• Biosensing Techniques * MeSH
• Chemical Phenomena MeSH
• Disulfides chemistry   MeSH
• Electrochemical Techniques * MeSH
• Graphite chemistry   MeSH
• Molybdenum chemistry   MeSH
• Nanocomposites chemistry   ultrastructure   MeSH
• Nanotechnology MeSH
• Chemistry Techniques, Synthetic MeSH
• Publication type
• Journal Article MeSH
• Review MeSH
• Names of Substances
• Disulfides MeSH
• Graphite MeSH
• Molybdenum MeSH
• molybdenum disulfide MeSH Browser

The removal of selenium from superficial and waste water is a worldwide problem. The maximum limit according to the World Health Organization (WHO) for the selenium in the water is set at a concentration of 10 μg/L. Carbon based adsorbents have attracted much attention and recently demonstrated promising performance in removal of selenium. In this work, several materials (iron oxide based microparticles and graphene oxides materials) and their composites were prepared to remove Se(IV) from water. The graphene oxides were prepared according to the simplified Hummer's method. In addition, the effect of pH, contact time and initial Se(IV) concentration was tested. An electrochemical method such as the differential pulse cathodic stripping voltammetry was used to determine the residual selenium concentration. From the experimental data, Langmuir adsorption model was used to calculate the maximum adsorption capacity. Graphene oxide particles modified by iron oxide based microparticles was the most promising material for the removal of Se(IV) from its aqueous solution at pH 2.0. Its adsorption efficiency reached more than 90% for a solution with given Se(IV) concentration, meanwhile its maximal recorded adsorption capacity was 18.69 mg/g.

• Keywords
• differential pulse cathodic stripping voltammetry, electrochemistry, graphene oxide, selenium removal, water purification,
• MeSH
• Adsorption MeSH
• Time Factors MeSH
• Water Pollutants, Chemical isolation & purification   MeSH
• Electrochemical Techniques methods   MeSH
• Electrodes MeSH
• Graphite chemistry   MeSH
• Hydrogen-Ion Concentration MeSH
• Microspheres MeSH
• Solutions MeSH
• Selenium isolation & purification   MeSH
• Static Electricity MeSH
• Temperature MeSH
• Particle Size MeSH
• Publication type
• Journal Article MeSH
• Names of Substances
• Water Pollutants, Chemical MeSH
• Graphite MeSH
• graphene oxide MeSH Browser
• Solutions MeSH
• Selenium MeSH