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Kyriazis Rekos
Department of Chemistry, Aristotle University of Thessaloniki, University Campus, Thessaloniki, Greece

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Journal article
Published: 07 June 2021 in Molecular Catalysis
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The herein presented ultrasound-assisted ultra-wet (US-UWet) impregnation synthetic approach was followed in order to avoid the drawbacks of the conventional wet impregnation synthesis. The goal was to homogeneously decorate the surface of the TiO2 nanoparticles with nanometric sized (< 4 nm) clusters of mixed cupric and cuprous oxides. The physicochemical features of the nanocomposite (TiO2CuOx) were determined by high-angle annular dark-field scanning transmission electron microscope (HAADF-STEM), high-resolution transmission electron microscopy (HR-TEM), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), and Diffuse reflectance (DR) spectroscopy. TiO2CuOx showed an enhanced and continuous capability to generate molecular hydrogen upon low power ultraviolet irradiation. The benchmark commercial TiO2 P25 did not reveal any H2 formation under these conditions. TiO2CuOx presented also a high efficiency for the additives-free selective partial oxidation of two well established biomass derived model platform chemicals/building blocks, 5-hydroxymethylfurfural (HMF) and benzyl alcohol (BnOH) to the value-added chemicals 2,5-diformylfuran (DFF) and benzyl aldehyde (PhCHO), respectively. The nanocomposite showed higher DFF and PhCHO yield compared to P25.

ACS Style

Dimitrios A. Giannakoudakis; Abdul Qayyum; Vaishakh Nair; Ayesha Khan; Swaraj R. Pradhan; Jovana Prekodravac; Kyriazis Rekos; Alec P. LaGrow; Oleksandr Bondarchuk; Dariusz Łomot; Konstantinos S. Triantafyllidis; Juan Carlos Colmenares. Ultrasound-assisted decoration of CuOx nanoclusters on TiO2 nanoparticles for additives free photocatalytic hydrogen production and biomass valorization by selective oxidation. Molecular Catalysis 2021, 111664 .

AMA Style

Dimitrios A. Giannakoudakis, Abdul Qayyum, Vaishakh Nair, Ayesha Khan, Swaraj R. Pradhan, Jovana Prekodravac, Kyriazis Rekos, Alec P. LaGrow, Oleksandr Bondarchuk, Dariusz Łomot, Konstantinos S. Triantafyllidis, Juan Carlos Colmenares. Ultrasound-assisted decoration of CuOx nanoclusters on TiO2 nanoparticles for additives free photocatalytic hydrogen production and biomass valorization by selective oxidation. Molecular Catalysis. 2021; ():111664.

Chicago/Turabian Style

Dimitrios A. Giannakoudakis; Abdul Qayyum; Vaishakh Nair; Ayesha Khan; Swaraj R. Pradhan; Jovana Prekodravac; Kyriazis Rekos; Alec P. LaGrow; Oleksandr Bondarchuk; Dariusz Łomot; Konstantinos S. Triantafyllidis; Juan Carlos Colmenares. 2021. "Ultrasound-assisted decoration of CuOx nanoclusters on TiO2 nanoparticles for additives free photocatalytic hydrogen production and biomass valorization by selective oxidation." Molecular Catalysis , no. : 111664.

Journal article
Published: 29 January 2021 in Processes
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The aim of the present study was to synthesize various samples of activated carbon (AC) from different agricultural sources as precursors, like orange peels, tea stalks, and kiwi peels, as well as sucrose. The synthesis of AC was achieved with chemical activation using H3PO4 and KOH. The produced AC samples were tested as adsorbents for the removal of a pharmaceutical model compound, pramipexole dihydrochloride (PRM), from synthetic aqueous synthetic solutions. The produced-from-sucrose AC presented the higher yield of synthesis (~58%). The physicochemical features of the materials were analyzed by FTIR spectroscopy, N2 physisorption, and SEM imaging. More specifically, the AC sample derived from sucrose (SG-AC) had the highest specific surface area (1977 m2/g) with the total pores volume, mesopores volume, and external surface area being 1.382 cm3/g, 0.819 cm3/g, and 751 m2/g, respectively. The effect of the initial pH and PRM concentration were studied, while the equilibrium results (isotherms) were fitted to Langmuir and Freundlich models. The maximum adsorption capacities were found to be 213, 190, 155, and 115 mg/g for AC samples produced from sucrose, kiwi peels, orange peels, and tea stalks, respectively.

ACS Style

Efstathios V. Liakos; Kyriazis Rekos; Dimitrios A. Giannakoudakis; Athanasios C. Mitropoulos; George Z. Kyzas. Carbonaceous Adsorbents Derived from Agricultural Sources for the Removal of Pramipexole Pharmaceutical Model Compound from Synthetic Aqueous Solutions. Processes 2021, 9, 253 .

AMA Style

Efstathios V. Liakos, Kyriazis Rekos, Dimitrios A. Giannakoudakis, Athanasios C. Mitropoulos, George Z. Kyzas. Carbonaceous Adsorbents Derived from Agricultural Sources for the Removal of Pramipexole Pharmaceutical Model Compound from Synthetic Aqueous Solutions. Processes. 2021; 9 (2):253.

Chicago/Turabian Style

Efstathios V. Liakos; Kyriazis Rekos; Dimitrios A. Giannakoudakis; Athanasios C. Mitropoulos; George Z. Kyzas. 2021. "Carbonaceous Adsorbents Derived from Agricultural Sources for the Removal of Pramipexole Pharmaceutical Model Compound from Synthetic Aqueous Solutions." Processes 9, no. 2: 253.

Journal article
Published: 11 January 2021 in Antibiotics
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The aim of the present study is the synthesis of activated carbon (AC) from different agricultural wastes such as tea and plane tree leaves in order to use them for the removal of pramipexole dihydrochloride (PRM) from aqueous solutions. Two different carbonization and synthetic activation protocols were followed, with the herein-proposed ultrasound-assisted two-step protocol leading to better-performing carbon, especially for the tea-leaf-derived material (TEA(char)-AC). Physicochemical characterizations were performed by Fourier-transform infrared spectroscopy (FTIR), N2 physisorption, and scanning electron microscopy (SEM). TEA(char)-AC presented the highest surface area (1151 m2/g) and volume of micro and small mesopores. Maximum capacity was found at 112 mg/g for TEA(char)-AC at an optimum pH equal to 3, with the Langmuir isotherm model presenting a better fitting. The removal efficiency of TEA(char)-AC is higher than other biomass-derived carbons and closer to benchmark commercial carbons.

ACS Style

Efstathios V. Liakos; Kyriazis Rekos; Dimitrios A. Giannakoudakis; Athanasios C. Mitropoulos; Jie Fu; George Z. Kyzas. Activated Porous Carbon Derived from Tea and Plane Tree Leaves Biomass for the Removal of Pharmaceutical Compounds from Wastewaters. Antibiotics 2021, 10, 65 .

AMA Style

Efstathios V. Liakos, Kyriazis Rekos, Dimitrios A. Giannakoudakis, Athanasios C. Mitropoulos, Jie Fu, George Z. Kyzas. Activated Porous Carbon Derived from Tea and Plane Tree Leaves Biomass for the Removal of Pharmaceutical Compounds from Wastewaters. Antibiotics. 2021; 10 (1):65.

Chicago/Turabian Style

Efstathios V. Liakos; Kyriazis Rekos; Dimitrios A. Giannakoudakis; Athanasios C. Mitropoulos; Jie Fu; George Z. Kyzas. 2021. "Activated Porous Carbon Derived from Tea and Plane Tree Leaves Biomass for the Removal of Pharmaceutical Compounds from Wastewaters." Antibiotics 10, no. 1: 65.

Journal article
Published: 20 June 2019 in Materials
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Magnetic graphene oxide was impregnated with polymers for the preparation of nanocomposite adsorbents to be examined for the adsorptive removal of a typical endocrine disruptor, bisphenol–A (BPA) from aqueous solutions. The polymers used were polystyrene, chitosan and polyaniline. The nanocomposites prepared were characterized for their structure, morphology and surface chemistry. The nanocomposites presented an increase adsorptive activity for BPA at ambient conditions, compared to pure magnetic oxide, attributed to the synergistic effect of the polymers and the magnetic graphene oxide. The increased adsorption of BPA exhibited by the nanocomposites with chitosan and polyaniline could be attributed to the contribution of amine groups.

ACS Style

Kyriazis Rekos; Zoi-Christina Kampouraki; Charalampos Sarafidis; Victoria Samanidou; Eleni Deliyanni. Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents. Materials 2019, 12, 1987 .

AMA Style

Kyriazis Rekos, Zoi-Christina Kampouraki, Charalampos Sarafidis, Victoria Samanidou, Eleni Deliyanni. Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents. Materials. 2019; 12 (12):1987.

Chicago/Turabian Style

Kyriazis Rekos; Zoi-Christina Kampouraki; Charalampos Sarafidis; Victoria Samanidou; Eleni Deliyanni. 2019. "Graphene Oxide Based Magnetic Nanocomposites with Polymers as Effective Bisphenol–A Nanoadsorbents." Materials 12, no. 12: 1987.

Journal article
Published: 27 May 2019 in Applied Sciences
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Sodium hydroxide-modified graphene oxide was used as manganese oxides support for the preparation of nanocomposites via a one-pot preparation route for the degradation of Reactive Black 5. The nanocomposites were characterized for their structure by X-ray diffraction, for their textural properties by Nitrogen adsorption, and for their surface chemistry by Fourier transform infrared spectroscopy, potentiometric titration, and thermal analysis measurements. The nanocomposites prepared showed to possess high activity for the degradation/oxidation of Reactive Black 5 at ambient conditions, without light irradiation, which was higher than that of the precursors manganese oxides and can be attributed to the synergistic effect of the manganese oxides and the modified graphene oxide.

ACS Style

Hayarpi Saroyan; Dimitra Ntagiou; Kyriazis Rekos; Eleni Deliyanni. Reactive Black 5 Degradation on Manganese Oxides Supported on Sodium Hydroxide Modified Graphene Oxide. Applied Sciences 2019, 9, 2167 .

AMA Style

Hayarpi Saroyan, Dimitra Ntagiou, Kyriazis Rekos, Eleni Deliyanni. Reactive Black 5 Degradation on Manganese Oxides Supported on Sodium Hydroxide Modified Graphene Oxide. Applied Sciences. 2019; 9 (10):2167.

Chicago/Turabian Style

Hayarpi Saroyan; Dimitra Ntagiou; Kyriazis Rekos; Eleni Deliyanni. 2019. "Reactive Black 5 Degradation on Manganese Oxides Supported on Sodium Hydroxide Modified Graphene Oxide." Applied Sciences 9, no. 10: 2167.