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168 results on '"Triantafyllidis, Konstantinos S."'

16. Comparative Study of the U(VI) Adsorption by Hybrid Silica-Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels

Author

Arkas, Michael, primary, Giannakopoulos, Konstantinos, additional, Favvas, Evangelos P., additional, Papageorgiou, Sergios, additional, Theodorakopoulos, George V., additional, Giannoulatou, Artemis, additional, Vardavoulias, Michail, additional, Giannakoudakis, Dimitrios A., additional, Triantafyllidis, Konstantinos S., additional, Georgiou, Efthalia, additional, and Pashalidis, Ioannis, additional

Published
2023
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27. Sub‐Micro Organosolv Lignin as Bio‐Based Epoxy Polymer Component: A Sustainable Curing Agent and Additive.

Author

Pappa, Christina P., Torofias, Stylianos, and Triantafyllidis, Konstantinos S.

Subjects
LIGNINS, POLYMERS, GLASS transition temperature, EPOXY resins, CURING, TENSILE strength, MOLECULAR weights
Abstract

Sub‐micro organosolv lignin (OBs) isolated from beechwood biomass, comprising of sub‐micro sized particles (570 nm) with low molecular weight and dispersity and relatively high total phenolic −OH content, is utilized for the production of bio‐based epoxy polymer composites. OBs lignin is incorporated into the glassy epoxy system based on diglycidyl ether of bisphenol A (DGEBA) and aliphatic polyoxypropylene α,ω‐diamine (Jeffamine D‐230), being utilized both as a curing agent, partially replacing D‐230, and as an additive, substituting part of both petroleum‐derived components. Up to 12 wt % replacement of D‐230 by OBs lignin is achieved, whereas approximately 17 wt % of OBs effectively replaces the conventional epoxy polymer. The incorporation of OBs lignin in the polymeric matrix is achieved without the use of any solvent or previous functionalization. Enhanced properties are obtained, with substantial increases in tensile strength, strain, stiffness, glass transition temperature, antioxidant activity, and resistance to solvents. [ABSTRACT FROM AUTHOR]

Published
2023
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36. Composites of Lignin-Based Biochar with BiOCl for Photocatalytic Water Treatment: RSM Studies for Process Optimization.

Author

Singh, Amit Kumar, Giannakoudakis, Dimitrios A., Arkas, Michael, Triantafyllidis, Konstantinos S., and Nair, Vaishakh

Subjects
WATER purification, BIOCHAR, PROCESS optimization, LIGNINS, AZO dyes, LIGHT absorption, REFLECTANCE spectroscopy, LIGNIN structure
Abstract

Textile effluents pose a massive threat to the aquatic environment, so, sustainable approaches for environmentally friendly multifunctional remediation methods degradation are still a challenge. In this study, composites consisting of bismuth oxyhalide nanoparticles, specifically bismuth oxychloride (BiOCl) nanoplatelets, and lignin-based biochar were synthesized following a one-step hydrolysis synthesis. The simultaneous photocatalytic and adsorptive remediation efficiency of the Biochar–BiOCl composites were studied for the removal of a benchmark azo anionic dye, methyl orange dye (MO). The influence of various parameters (such as catalyst dosage, initial dye concentration, and pH) on the photo-assisted removal was carried out and optimized using the Box–Behnken Design of RSM. The physicochemical properties of the nanomaterials were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetric analysis, nitrogen sorption, and UV–Vis diffuse reflectance spectroscopy (DRS). The maximum dye removal was observed at a catalyst dosage of 1.39 g/L, an initial dye concentration of 41.8 mg/L, and a pH of 3.15. The experiment performed under optimized conditions resulted in 100% degradation of the MO after 60 min of light exposure. The incorporation of activated biochar had a positive impact on the photocatalytic performance of the BiOCl photocatalyst for removing the MO due to favorable changes in the surface morphology, optical absorption, and specific surface area and hence the dispersion of the photo-active nanoparticles leading to more photocatalytic active sites. This study is within the frames of the design and development of green-oriented nanomaterials of low cost for advanced (waste)water treatment applications. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Characterization of Ni-Phases and Their Transformations in Fluid Catalytic Cracking (FCC) Catalysts: Comparison of Conventional Versus Boron-Based Ni-Passivation.

Author

Charisteidis, Ioannis D., Trikalitis, Pantelis N., Triantafyllidis, Konstantinos S., Komvokis, Vasileios, and Yilmaz, Bilge

Subjects
CATALYTIC cracking, CATALYSTS, X-ray powder diffraction, ZEOLITE catalysts, POLLUTANTS, PETROLEUM chemicals industry
Abstract

Fluid Catalytic Cracking (FCC) has traditionally been a key refining process in generating transportation fuels. Recently, the focus on FCC has been further intensified as it plays an increasingly important role in the generation of key building blocks for the petrochemical industry. Nickel is considered as one of the most challenging contaminants in FCC and originates from Ni-containing compounds in petroleum fractions, not only during unit operation but also in handling of the equilibrium and spent catalysts. Despite this critical role it plays throughout the complete lifecycle of an FCC catalyst, the nature of Ni is not yet well understood at various stages of its journey after depositing on the catalyst surface. The main objective of this contribution is the qualitative and quantitative identification of the various possible phases of Ni that are usually present in an equilibrium FCC catalyst (Ecat). A series of conventional and advanced analytical techniques have been employed, including XRF, ICP-AES, PXRD, FT-IR, UV-Vis-NIR, SEM-EDS, TEM/HRTEM and STEM/EXDS, XPS, RAMAN and TPR-H2, on prototype Ni-impregnated SiO2, Al2O3 and USY zeolite samples, Ni-impregnated and lab-deactivated FCC samples, and equilibrium FCC catalysts obtained from different refineries. Detailed analysis of the obtained results on the basis of background information, showed the strengths and weaknesses of the various methods. It was shown that powder x-ray diffraction (pxrd) can be effectively used for the quantitative determination of the NiO (bunsenite) phase at levels representative of equilibrium FCC catalysts. A comparison of conventional versus boron-based Ni-passivation is presented. It was shown that catalysts from boron-based technology (BBT) can keep Ni at a less-reducible state, effectively hindering its deleterious role in FCC operations. [ABSTRACT FROM AUTHOR]

Published
2023
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41. Ultrasound-assisted decoration of CuOx nanoclusters on TiO2 nanoparticles for additives free photocatalytic hydrogen production and biomass valorization by selective oxidation

Author

Giannakoudakis, Dimitrios A., primary, Qayyum, Abdul, additional, Nair, Vaishakh, additional, Khan, Ayesha, additional, Pradhan, Swaraj R., additional, Prekodravac, Jovana, additional, Rekos, Kyriazis, additional, LaGrow, Alec P., additional, Bondarchuk, Oleksandr, additional, Łomot, Dariusz, additional, Triantafyllidis, Konstantinos S., additional, and Colmenares, Juan Carlos, additional

Published
2021
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44. Bottom-Up Development of Nanoimprinted PLLA Composite Films with Enhanced Antibacterial Properties for Smart Packaging Applications

Author

Psochia, Eleni, primary, Papadopoulos, Lazaros, additional, Gkiliopoulos, Dimitrios J., additional, Francone, Achille, additional, Grigora, Maria-Eirini, additional, Tzetzis, Dimitrios, additional, de Castro, Joana Vieira, additional, Neves, Nuno M., additional, Triantafyllidis, Konstantinos S., additional, Torres, Clivia M. Sotomayor, additional, Kehagias, Nikolaos, additional, and Bikiaris, Dimitrios N., additional

Published
2021
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47. Synthesis and Characterization of Mesoporous Mg- and Sr-Doped Nanoparticles for Moxifloxacin Drug Delivery in Promising Tissue Engineering Applications

Author

Pouroutzidou, Georgia K., primary, Liverani, Liliana, additional, Theocharidou, Anna, additional, Tsamesidis, Ioannis, additional, Lazaridou, Maria, additional, Christodoulou, Evi, additional, Beketova, Anastasia, additional, Pappa, Christina, additional, Triantafyllidis, Konstantinos S., additional, Anastasiou, Antonios D., additional, Papadopoulou, Lambrini, additional, Bikiaris, Dimitrios N., additional, Boccaccini, Aldo R., additional, and Kontonasaki, Eleana, additional

Published
2021
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48. Recommendations for replacing PET on packaging, fiber, and film materials with biobased counterparts

Author

Sousa, Andreia F., primary, Patrício, Rafael, additional, Terzopoulou, Zoi, additional, Bikiaris, Dimitrios N., additional, Stern, Tobias, additional, Wenger, Julia, additional, Loos, Katja, additional, Lotti, Nadia, additional, Siracusa, Valentina, additional, Szymczyk, Anna, additional, Paszkiewicz, Sandra, additional, Triantafyllidis, Konstantinos S., additional, Zamboulis, Alexandra, additional, Nikolic, Marija S., additional, Spasojevic, Pavle, additional, Thiyagarajan, Shanmugam, additional, van Es, Daan S., additional, and Guigo, Nathanael, additional

Published
2021
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