Bildiri Koleksiyonuhttps://hdl.handle.net/11421/178052024-03-29T13:49:32Z2024-03-29T13:49:32ZDetermination of oxalate ion in bayer liquor using electrochemical methodTurhan, S.Usta, B.Şahin, Y.Uysal, O.https://hdl.handle.net/11421/178772019-10-20T14:27:51Z2011-01-01T00:00:00ZDetermination of oxalate ion in bayer liquor using electrochemical method
Turhan, S.; Usta, B.; Şahin, Y.; Uysal, O.
The Bayer process can be summarized as the digestion of bauxite with caustic liquor and the subsequent precipitation of hydrated alumina [1]. Most bauxite contains organic compounds in various amounts. Depending upon the digestion conditions, 5-10% of the organic carbon is converted to sodiumoxalate [2]. When sodiumoxalate, if not controlled in Bayer process, builds up to a certain level of supersaturation, it precipitates out in the hydrate precipitator tank. This co-precipitation affects the quality of alumina [3]. In this study, we investigated the electrochemical determination of oxalate ion by using differential puls voltammetry in Bayer liquor. A linear relationship between oxalate concentration and current response was obtained with good reproducibility of the current.
Light Metals 2011 - TMS 2011 Annual Meeting and Exhibition -- 27 February 2011 through 3 March 2011 -- San Diego, CA -- 84639
2011-01-01T00:00:00ZAmino acid conjugated self assembly molecules modified Si wafers [Amino asit konjuge kendili?inden düzenlenen moleküller ile si pulcuklari{dotless}n modifikasyonu]Aktaş, BengüUzun, LokmanHür, DenizGaripcan, Borahttps://hdl.handle.net/11421/178622020-08-16T09:55:30Z2003-01-01T00:00:00ZAmino acid conjugated self assembly molecules modified Si wafers [Amino asit konjuge kendili?inden düzenlenen moleküller ile si pulcuklari{dotless}n modifikasyonu]
Aktaş, Bengü; Uzun, Lokman; Hür, Deniz; Garipcan, Bora
In this study, Si wafer surface was modified with newly synthesized self-assembled monolayers to mimic a biocompatible micro-environment for the cells and to observe their behavior. Begin with; Si wafer is chosen as its availability is easy and well-established structures can be obtained in the surface modification without any interference. In the first step, Si wafers were cleaned and modification of surfaces was carried out with amino acid conjugated self-assembled molecules [Histidine-Self Assembled Molecule (His-SAM), and Leucine-Self Assembled Molecule (Leu-SAM)], (3-aminopropyl)triethoxysilane (APTES) and also poly-L-ornithine (PLO). The characterization of these samples were analyzed with contact angle measurements, X-Ray Photoelectron Spectroscopy (XPS), Atomic Force Microscopy (AFM), and ellipsometry. After characterization results were acquired, the cell culture studies were performed with L929 cells. In order to obtain information about cell proliferation, MTT assay (a colorimetric assay) was performed. According to these results, enhanced cell proliferation was achieved by the contribution of surface functional groups. Consequently, it has been observed that these controlled molecular structures on the surfaces of materials have a great potential for biomedical applications
2014 18th National Biomedical Engineering Meeting, BIYOMUT 2014 -- 16 October 2014 through 17 October 2014 -- -- 110485
2003-01-01T00:00:00ZHome-prepared anatase, rutile, and brookite TiO2 for selective photocatalytic oxidation of 4-methoxybenzyl alcohol in water: reactivity and ATR-FTIR studyAugugliaro, VincenzoLoddo, VittorioJose Lopez-MunÖz, MariaMarquez-Alvarez, CarlosPalmisano, GiovanniPalmisano, LeonardoYurdakal, Sedathttps://hdl.handle.net/11421/178482020-08-16T09:55:27Z2009-01-01T00:00:00ZHome-prepared anatase, rutile, and brookite TiO2 for selective photocatalytic oxidation of 4-methoxybenzyl alcohol in water: reactivity and ATR-FTIR study
Augugliaro, Vincenzo; Loddo, Vittorio; Jose Lopez-MunÖz, Maria; Marquez-Alvarez, Carlos; Palmisano, Giovanni; Palmisano, Leonardo; Yurdakal, Sedat
TiO2 catalysts of anatase, rutile and brookite phase were prepared at low temperature and tested for carrying out the photocatalytic partial oxidation of 4-methoxybenzyl alcohol to 4-methoxybenzaldehyde (p-anisaldehyde) in organic-free water suspensions. Traces of 4-methoxybenzoic acid and open-ring products were the only by-products present, CO2 being the other main oxidation product. Rutile exhibited the highest yield to p-anisaldehyde (62% mol) at a rate of the same order of magnitude of that showed by the other samples. Commercial rutile and anatase photocatalysts were also used for the sake of comparison. The samples have been characterised by an in situ ATR-FTIR investigation carried out in conditions simulating the photoreaction ones.
5th European Meeting on Solar Chemistry and Photocatalysis -- OCT 04-08, 2008 -- Palermo, ITALY; WOS: 000265890300014; PubMed ID: 19424540
2009-01-01T00:00:00ZSynthesis of new Rh(I) and Ru(III) complexes and investigation of their catalytic activities on olefin hydrogenation in green reaction mediaÜnver, H.Yılmaz, F.https://hdl.handle.net/11421/178382019-10-20T14:27:48Z2017-01-01T00:00:00ZSynthesis of new Rh(I) and Ru(III) complexes and investigation of their catalytic activities on olefin hydrogenation in green reaction media
Ünver, H.; Yılmaz, F.
Two new Ru(III) and Rh(I) complexes of N-acyl benzotriazole derivative ligand have been synthesized and characterized. The catalytic activities of complexes were tested on styrene and 1-octene hydrogenation in ionic liquid ([bmim][BF4]), DMSO and toluene media. For styrene hydrogenation, 100 % ethyl benzene conversion was obtained with Rh(I) complex, while the conversion ratio was found to be 86.6 % with Ru(III) complex. The catalytic experiments was also conducted in DMSO and toluene to make comparison with ionic liquid under the same conditions (393 K and 6h). 1-octene conversion was found to be 94.5 % with Rh(I) complex at 373 K for 1h. The effect of H-2(g) pressure and catalyst amount was also tested on catalytic reactions. Reusability tests of complexes was investigated over five reaction cycle under 10 bar H-2 in [bmim][BF4]. No activity loss was observed during five cycle with Rh complex.
3rd International Conference on New Trends in Chemistry -- APR 28-30, 2017 -- Helsinki, FINLAND; WOS: 000413538600011
2017-01-01T00:00:00Z