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Articles 1 - 30 of 167
Full-Text Articles in Physical Sciences and Mathematics
Process Optimization And Mechanism Study Of Acid Red G Degradation By Electro-Fentonfeox Process As An In Situ Generation Of H2o2, Hailong Sun, Yingwu Yao, Feng Wei, Qiang Zhao, Baichen Liu, Liman Zhang
Process Optimization And Mechanism Study Of Acid Red G Degradation By Electro-Fentonfeox Process As An In Situ Generation Of H2o2, Hailong Sun, Yingwu Yao, Feng Wei, Qiang Zhao, Baichen Liu, Liman Zhang
Turkish Journal of Chemistry
Dye-contaminated wastewaters are industrial wastewaters that are difficult to treat using traditional biochemical and physicochemical methods. In the present work, the acid red G was removed as a model pollutant by the electro-Fenton process for the first time. The anode and cathode used by the electro-Fenton process were iron plate and graphite felt, respectively. It was concluded that under the optimal conditions of current density = 20 mA cm-2, pH = 3 and initial Na2SO4 concentration = 0.2 M, the removal rate of acid red G (ARG) with an initial concentration of 300 mg L-1 could reach 94.05% after 80 …
Synthesis Of Nonperipherally Tetra-[5-(Diethylamino)-2-Formylphenoxy] Substituted Metallophthalocyanines And Their Electrochemistry, Turgut Keleş, Di̇lek Ünlüer, Zekeri̇ya Biyiklioğlu, Yasemi̇n Ünver
Synthesis Of Nonperipherally Tetra-[5-(Diethylamino)-2-Formylphenoxy] Substituted Metallophthalocyanines And Their Electrochemistry, Turgut Keleş, Di̇lek Ünlüer, Zekeri̇ya Biyiklioğlu, Yasemi̇n Ünver
Turkish Journal of Chemistry
3-[5-(diethylamino)-2-formylphenoxy]phthalonitrile (n-TY-CN), metallophthalocyanines n-TY-Co, n-TY-Cu, and n-TY-Mn bearing [5-(diethylamino)-2-formylphenoxy] groups at nonperipheral positions were prepared for the first time. These compounds were characterized with IR, NMR (only for n-TY-CN), mass and UV-vis (except n-TY-CN) spectroscopy. Voltammetric characterizations of n-TY-Co, n-TY-Cu, and n-TY-Mn revealed that while n-TY-Co, n-TY-Cu, and n-TY-Mn showed characteristic Pc ring and/or metal-based reduction reaction, n-TY-Co, n-TY-Cu, and n-TY-Mn were coated on the working electrode during the oxidation processes owing to the cationic electropolymerizations of the [5-(diethylamino)-2-formylphenoxy] substituents.
Validation Of Hplc Method For The Determination Of Chemical And Radiochemical Purity Of A 68ga-Labelled Euk-Sub-Kf-(3-Iodo-Y-) Dotaga, Ayşe Uğur, Şükrü Gökhan Elçi̇, Doğangün Yüksel
Validation Of Hplc Method For The Determination Of Chemical And Radiochemical Purity Of A 68ga-Labelled Euk-Sub-Kf-(3-Iodo-Y-) Dotaga, Ayşe Uğur, Şükrü Gökhan Elçi̇, Doğangün Yüksel
Turkish Journal of Chemistry
The prostate-specific membrane antigen (PSMA) represents an ideal biomarker for molecular imaging. Various PSMA-targeted radioligands are available for prostate cancer imaging. In this study, labeling of PSMA I&T with 68Ga, as well as validation of the radiochemical purity of the synthesis product by reverse phase radio high-performance liquid chromatography (HPLC) method are intended. Since the standard procedure for the quality control (QC) was not available, definition of chemical and radiochemical purity of 68Ga-PSMA I&T was carried out according to the Q2 (R1) ICH guideline. The standard QC tests were analyzed with Scintomics 8100 radio-HPLC system equipped with a radioactivity detector. …
Synthesis Of 7,12-Bis(4-(Di(1h-Pyrrol-2-Yl)Methyl)Phenyl)Benzo[K]Fluoranthene From Anew Dialdehyde As A Novel Fluorometric Bis-Dipyrromethane Derivative, Faride Ranjbari, Salar Hemmati, Mohammad Reza Rashidi
Synthesis Of 7,12-Bis(4-(Di(1h-Pyrrol-2-Yl)Methyl)Phenyl)Benzo[K]Fluoranthene From Anew Dialdehyde As A Novel Fluorometric Bis-Dipyrromethane Derivative, Faride Ranjbari, Salar Hemmati, Mohammad Reza Rashidi
Turkish Journal of Chemistry
Dipyrromethanes are useful mediator structures which can be used as a part of other molecules such as bis-porphyrins and their derivations. Various methods have been developed for their synthesis. This study presents the synthesis of a new bis- dipyrromethane, 7,12-bis(4-(di(1H-pyrrol-2-yl)methyl)phenyl)benzo[k]fluoranthene, using the Lewis acid catalyzed reaction between a new dialdehyde and pyrrole at room temperature. The UV spectroscopic and fluorometric properties of the final product and precursors were determined. The newly synthesized product with desirable UV spectroscopic and fluorometric properties has the potential to be applied as a part of bisporphyrins or it can be used for other purposes in …
Synthesis And Characterization Of Novel 4-Benzyloxyphenyl 4-[4-(N-Dodecyloxy)Benzoyloxy]Benzoate Liquid Crystal, Emi̇ne Balkanli, Fati̇h Çakar, Hale Ocak, Özlem Cankurtaran, Belkiz Bi̇lgi̇n Eran
Synthesis And Characterization Of Novel 4-Benzyloxyphenyl 4-[4-(N-Dodecyloxy)Benzoyloxy]Benzoate Liquid Crystal, Emi̇ne Balkanli, Fati̇h Çakar, Hale Ocak, Özlem Cankurtaran, Belkiz Bi̇lgi̇n Eran
Turkish Journal of Chemistry
Liquid crystal (LC) compound 4-Benzyloxyphenyl 4-[4-(n-dodecyloxy)benzoyloxy]benzoate (BDBB) was prepared and characterized. Inverse gas chromatography (IGC) was to be a beneficial analysis method for the research of thermodynamic characteristics of the new LC. Acetate and alcohol isomers were used to examine LC selectivity via the IGC technique at temperatures between 333.2 K and 483.2 K. The retention diagrams of n-heptane, n-octane, n-nonane, n-decane, undecane, dodecane, tridecane, n-butyl acetate, isobutyl acetate, ethyl acetate, n-propylbenzene, isopropylbenzene, ethylbenzene, chlorobenzene, and toluene on BDBB were plotted with temperatures of 483.2?493.2 K. Flory?Huggins interaction parameter and weight fraction activity coefficient at infinite dilution were researched for …
Investigation Of Olea Ferruginea Roylebark Extracts For Potential In Vitroantidiabetic And Anticancer Effects, Samra Liaqat, Muhammad Islam, Hamid Saeed, Mehwish Iqtedar, Azra Mehmood
Investigation Of Olea Ferruginea Roylebark Extracts For Potential In Vitroantidiabetic And Anticancer Effects, Samra Liaqat, Muhammad Islam, Hamid Saeed, Mehwish Iqtedar, Azra Mehmood
Turkish Journal of Chemistry
This study was conducted to investigate the physicochemical, phytochemical, in vitro antidiabetic and anticancer potential of Olea ferruginea R bark. After extraction using Soxhlet, in vitro antidiabetic and cytotoxic activity on human hepatocellular carcinoma (HepG2) cells was assessed by nonenzymatic glycosylation of hemoglobin assay, alpha-amylase inhibition assay, glucose uptake by yeast cells, and 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide assay, respectively, and gene expression via real-time polymerase chain reaction. Primary and secondary metabolites were present in the extractants; polyphenols (35.61 ± 0.03) and flavonoids (64.33 ± 0.35) in the chloroform; and polysaccharides in the ethanol (268.75 ± 0.34), and glycosaponins (78.01 ± …
Theoretical Investigation Of The Interaction Between The Metal Phthalocyanine [Mpc] A(M = Sc, Ti, And V; A = ?1, 0, And +1) Complexes And Formaldehyde, Nasim Hassani
Turkish Journal of Chemistry
Formaldehyde (FA, CH2O) is one of the toxic volatile organic compounds that cause harmful effects on the human body. In this work, the interaction of FA gas with metal phthalocyanine (MPc) molecules was studied by employing density functional theory calculations. A variety of [MPc] a (M = Sc, Ti, and V; a = -1, 0, and +1) complexes were studied, and the electronic properties, interaction energies, and charge transfer properties of all of the studied molecules were systematically discussed. Among the studied complexes, the Sc and Ti phthalocyanines were more reactive toward the adsorption of FA gas. Moreover, it was …
Cytotoxic And Apoptotic Potential Of Some Coumarin And 2-Amino-3-Carbonitrile Selenophene Derivatives In Prostate Cancer, Meti̇n Yildirim, Mehmet Erşatir, Badel Arslan, Eli̇fe Sultan Gi̇ray
Cytotoxic And Apoptotic Potential Of Some Coumarin And 2-Amino-3-Carbonitrile Selenophene Derivatives In Prostate Cancer, Meti̇n Yildirim, Mehmet Erşatir, Badel Arslan, Eli̇fe Sultan Gi̇ray
Turkish Journal of Chemistry
3-acetyl coumarin derivatives (1a-d) are formed as a result of condensation of salicylaldehyde derivatives and ethyl acetoacetate and were converted into coumarin-selenophene hybrid compounds (2a-d) in the basic medium by modified Gewald reaction in the presence of malononitrile and selenium. Products are characterized by nuclear magnetic resonance (NMR). The prepared compounds are screened for their anticancer activity against DU-145 cell line. In addition, selected target compounds are evaluated for apoptosis and oxidative stress on DU-145 (prostate carcinoma) cell lines.
Fabrication Of Silane-Modified Magnetic Nano Sorbent For Enhanced Ultrasonic Wave Driven Removal Of Methylene Blue From Aqueous Media: Isotherms, Kinetics, And Thermodynamic Mechanistic Studies, Abdullah ., Esra Alveroğlu Durucu, Aamna Balouch, Ali Muhammad Mahar
Fabrication Of Silane-Modified Magnetic Nano Sorbent For Enhanced Ultrasonic Wave Driven Removal Of Methylene Blue From Aqueous Media: Isotherms, Kinetics, And Thermodynamic Mechanistic Studies, Abdullah ., Esra Alveroğlu Durucu, Aamna Balouch, Ali Muhammad Mahar
Turkish Journal of Chemistry
In this study, we report a simple and economic one-pot synthesis of magnetite (Fe3O4) nanostructure and its modification with tetraethyl orthosilicate by coprecipitation method. The synthesized (Fe3O4@SiO2) nano sorbent was applied for enhanced adsorptive removal of methylene blue by ultrasonic wave driven batch experiments. After successful synthesis, the nanostructure was characterized for their physical structure by FT-IR, VSM, TEM, and XRD. For the maximum adsorptive performance of nano sorbent, various parameters were optimized, such as dose, pH, time, concentration, and temperature. The adsorption mechanism was best fitted by Langmuir isotherm with a maximum capacity of 148.69 mg/g, while kinetics best …
New Chlorogenic Acid Derivatives And Triterpenoids From Scorzonera Aucheriana, İshak Eri̇k, Kami̇l Çoşkunçelebi̇, Serdar Makbul, Nuretti̇n Yayli
New Chlorogenic Acid Derivatives And Triterpenoids From Scorzonera Aucheriana, İshak Eri̇k, Kami̇l Çoşkunçelebi̇, Serdar Makbul, Nuretti̇n Yayli
Turkish Journal of Chemistry
Chromatographic separation of n-hexane and ethyl acetate fraction of a crude methanol extract obtained from aerial parts of the Scorzonera aucheriana DC collected from Sivas province of Turkey yielded nine natural compounds; two new 3-caffeoyl-quinic acid analogs (1-2), one new taraxasterol oleate (3), and six known triterpenoids taraxasterol (4), taraxasterol acetate (5), ptiloepoxide (6), lupeol (7), lupeol acetate (8), and β-sitosterol (9) were characterized. The structures of the isolated compounds were elucidated on the basis of NMR (1H, 13C, COSY, HMBC, HSQC, and TOCSY), UV, FT-IR and LC-Q-TOF-MS spectrometric data.
Vortex-Assisted Magnetic Solid Phase Extraction Of Pb And Cu In Some Herb Samples On Magnetic Multiwalled Carbon Nanotubes, Di̇lek Kamaş, Aslihan Karatepe, Mustafa Soylak
Vortex-Assisted Magnetic Solid Phase Extraction Of Pb And Cu In Some Herb Samples On Magnetic Multiwalled Carbon Nanotubes, Di̇lek Kamaş, Aslihan Karatepe, Mustafa Soylak
Turkish Journal of Chemistry
This study is the development of a new solid phase extraction method based on using magnetic multiwalled carbon nanotubes impregnated with 1-(2-pyridylazo)2-naphthol (PAN) for separation, preconcentration, and flame atomic absorption spectrometric determination of Pb(II) and Cu(II). Optimization of the method was done by investigating pH effect, amount of magnetic multiwalled carbon nanotubes impregnated with PAN, eluent type and volume, matrix effects, and volume of the sample. The optimum adsorbent amount was found to be 75 mg and the optimum pH value was found as 5.5. The detection limits were 16.6 μg L-1 for Pb(II) and 18.9 μg L-1 for Cu(II). …
4,4'-Trimethylenedipiperidine As A Nitrogen Heterocycle Solvent And/Or Catalyst: Liquid Phase Tandem Knoevenagel-Michael Condensation, Lia Zaharani, Nader Ghaffari Khaligh, Hayede Gorjian, Mohd Rafie Johan
4,4'-Trimethylenedipiperidine As A Nitrogen Heterocycle Solvent And/Or Catalyst: Liquid Phase Tandem Knoevenagel-Michael Condensation, Lia Zaharani, Nader Ghaffari Khaligh, Hayede Gorjian, Mohd Rafie Johan
Turkish Journal of Chemistry
Liquid phase tandem Knoevenagel-Michael condensation of various aromatic and heteroaromatic aldehydes with barbituric acid or 2-thiobarbituric acid and malononitrile was studied in a one-pot three-component reaction. For the first time, TMDP was employed as a safe and efficient solvent and/or catalyst in the liquid and aqueous ethanol medium, respectively, for the practical and eco-friendly Knoevenagel-Michael condensation. The reactions were carried out by using greener procedures, including a) the use of TMDP as an N-heterocycle organocatalyst in a green medium including water and ethanol (1:1 v/v) at reflux temperature, and b) the use of TMDP as a dual solvent-catalyst at 65 …
Microwave Assisted, Sequential Two-Step, One-Pot Synthesis Of Novel Imidazo[1,2-A]Pyrimidine Containing Tri/Tetrasubstituted Imidazole Derivatives, Tuğba Güngör
Turkish Journal of Chemistry
A series of novel imidazo[1,2-a]pyrimidine containing tri/tetrasubstituted imidazole derivatives (1-10) has been synthesized via sequential two-step, one-pot, multicomponent reaction using imidazo[1,2-a]pyrimidine-2-carbaldehyde, benzil, primary amines, and ammonium acetate catalyzed by p-toluenesulfonic acid under microwave-assisted conditions. The results showed that target compounds can be obtained from a wide range of primary amines bearing different functional groups with moderate to good yields (46%-80%) under optimum reaction conditions. This method provides a green protocol for imidazo[1,2-a]pyrimidine containing tri/ tetrasubstituted imidazole derivatives due to ethyl alcohol as a green solvent, microwave irradiation as a greener heating method and one-pot multicomponent reaction as a green technique. …
Formation And Characterization Of Mechanochemically Generated Free Lignin Radicalsfrom Olive Seeds, Fatma Demi̇r
Formation And Characterization Of Mechanochemically Generated Free Lignin Radicalsfrom Olive Seeds, Fatma Demi̇r
Turkish Journal of Chemistry
In this study, formation and quantification of mechanochemically generated free radicals of lignin were evaluated after the extraction of lignin from olive seeds and detailed lignin characterization was performed. Lignin was extracted from crushed olive seeds as an insoluble solid using Klason method. Isolated lignin was mechanochemically grinded under cryo conditions using Cryomill and particlesizes were determined by using Zeta Sizer, structural changes were followed by XRD and FTIR-ATR; thermal stabilities were tracked by TGA and DSC. In order to enable solubility demanding studies (such as 1H-NMR and GPC), acylation of lignin was accomplished. ESR measurements were completed to prove …
Enhanced Ethanol Sensing Properties Of Wo$_{3}$ Modified Tio$_{2}$ Nanorods, Bekzat Abdikadyr, Alp Kiliç, Onur Alev, Serkan Büyükköse, Zafer Zi̇ya Öztürk
Enhanced Ethanol Sensing Properties Of Wo$_{3}$ Modified Tio$_{2}$ Nanorods, Bekzat Abdikadyr, Alp Kiliç, Onur Alev, Serkan Büyükköse, Zafer Zi̇ya Öztürk
Turkish Journal of Chemistry
Pristine and WO$_{3}$ decorated TiO$_{2}$ nanorods (NRs) were synthesised to investigate n-n-type heterojunction gas sensing properties. TiO$_{2}$ NRs were fabricated via hydrothermal method on fluorine-doped tin oxide coated glass (FTO) substrates. Then, tungsten was sputtered on the TiO$_{2}$ NRs and thermally oxidised to obtain WO$_{3}$ nanoparticles. The heterostructure was characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) spectroscopy. Fabricated sensor devices were exposed to VOCs such as toluene, xylene, acetone and ethanol, and humidity at different operation temperatures. Experimental results demonstrated that the heterostructure has better sensor response toward ethanol at 200 °C. Enhanced sensing …
Electrophoretic Deposition And Characterization Of Self-Doped Srtio$_{3}$ Thin Films, Naeimeh Sadat Peighambardoust, Umut Aydemi̇r
Electrophoretic Deposition And Characterization Of Self-Doped Srtio$_{3}$ Thin Films, Naeimeh Sadat Peighambardoust, Umut Aydemi̇r
Turkish Journal of Chemistry
Herein, titanium (Ti$^{3+}$) self-doped strontium titanate (SrTiO$_{3}$), so-called blue SrTiO$_{3}$, with a bandgap of 2.6 eV and favorable photocatalytic characteristics was fabricated through a facile and effective method. For electrochemical investigations, the electrophoretic deposition was applied to produce SrTiO$_{3}$ thin films on (fluorine-doped tin oxide) FTO conductive substrates. The electrophoretic voltage of 20 V and a process duration of 10 min were optimized to reach transparent and uniform coatings on FTO. The blue SrTiO$_{3}$ reveals lower resistance (charge transfer resistance of 6.38 Ω cm$^{-2}$) and higher electron mobility (current density value of 0.25 mA cm?2) compared to a pure SrTiO$_{3}$ …
Efficiency Enhancement With Chloride To Iodide Ion Exchange Of Benzimidazolium Salt Asa Redox Mediator, Serkan Dayan, Mert Olgun Karataş, Bülent Alici, Ni̇lgün Kalaycioğlu Özpozan
Efficiency Enhancement With Chloride To Iodide Ion Exchange Of Benzimidazolium Salt Asa Redox Mediator, Serkan Dayan, Mert Olgun Karataş, Bülent Alici, Ni̇lgün Kalaycioğlu Özpozan
Turkish Journal of Chemistry
The new benzimidazolium derivative (SM-1) salt with ion exchange from the (SM-0) was fabricated and characterized by protonnuclear magnetic resonance (1H-NMR), carbon-nuclear magnetic resonance (13C-NMR), Fourier-transform infrared spectroscopy (FTIR), electrospray ionization (EIS-MS), thermal analysis (TG), cyclic voltammetry (CV), and ultraviolet-visible spectroscopy (UV-vis), for electrolytes (liquid or dried) in the DSSC charge transportation mechanism. Also, the influence of ion exchange from chloride to iodine in the synthesized electrolytes, compared to other electrolytes (conventional or commercial), was investigated about DSSC performance efficiency. When using as a liquid electrolyte (SM-1), the power conversion efficiency (η) of the working DSSC device was recorded as …
Reusability And Regeneration Of Solid Catalysts Used In Ultrasound Assisted Biodieselproduction, Mahmut Rahi̇m Bayramoğlu, İbrahi̇m Korkut, Başak Temur Ergan
Reusability And Regeneration Of Solid Catalysts Used In Ultrasound Assisted Biodieselproduction, Mahmut Rahi̇m Bayramoğlu, İbrahi̇m Korkut, Başak Temur Ergan
Turkish Journal of Chemistry
Reusability of two heterogeneous catalysts in ultrasound (US) assisted biodiesel production was investigated in comparison to each other. An ultrasound (US) generator (200 W, 20 kHz) equipped with a horn type probe (19 mm) was used. Regeneration experiments were planned according to second order central composite design (CCD) method. After the eighth use of the catalysts, biodiesel yield decreased from 99.1% to 90.4% for calcined calcite (CaO) and from 98.8% to 89.8% for calcined dolomite (CaO.MgO). Furthermore, regeneration of spent catalysts by calcination was investigated; optimum temperature and time were found as 750 °C and 90 min, lower than fresh …
Removal Of Cd(Ii), Cu(Ii), And Pb(Ii) By Adsorption Onto Natural Clay: A Kinetic Andthermodynamic Study, Brahim Abbou, Imane Lebkiri, Hanae Ouaddari, Lamya Kadiri, Abdelkarim Ouass, Amar Habssaoui, Ahmed Lebkiri, El Housseine Rifi
Removal Of Cd(Ii), Cu(Ii), And Pb(Ii) By Adsorption Onto Natural Clay: A Kinetic Andthermodynamic Study, Brahim Abbou, Imane Lebkiri, Hanae Ouaddari, Lamya Kadiri, Abdelkarim Ouass, Amar Habssaoui, Ahmed Lebkiri, El Housseine Rifi
Turkish Journal of Chemistry
In this work, we study the elimination of three bivalent metal ions (Cd$^{2+}$, Cu$^{2+}$, and Pb$^{2+}$) by adsorption onto natural illitic clay (AM) collected from Marrakech region in Morocco. The characterization of the adsorbent was carried out by X-ray fluorescence, Fourier transform infrared spectroscopy and X-ray diffraction. The influence of physicochemical parameters on the clay adsorption capacity for ions Cd$^{2+}$, Cu$^{2+}$, and Pb$^{2+}$, namely the adsorbent dose, the contact time, the initial pH imposed on the aqueous solution, the initial concentration of the metal solution and the temperature, was studied. The adsorption process is evaluated by different kinetic models such …
Accelerated Fe$^{Iii}$/Fe$^{Ii}$ Redox Cycle Of Fenton Reaction System Using Pd/Nh$_{2}$-Mil-101(Cr)And Hydrogen, Zhong-Xing Liu, Xin Liu, Yong Li, Shi-Qian Gao
Accelerated Fe$^{Iii}$/Fe$^{Ii}$ Redox Cycle Of Fenton Reaction System Using Pd/Nh$_{2}$-Mil-101(Cr)And Hydrogen, Zhong-Xing Liu, Xin Liu, Yong Li, Shi-Qian Gao
Turkish Journal of Chemistry
In this paper, a novel improvement in the catalytic Fenton reaction system named MHACF-NH$_{2}$-MIL-101(Cr) was constructed based on H$_{2}$ and Pd/NH$_{2}$-MIL-101(Cr). The improved system would result in an accelerated reduction in Fe$^{III}$, and provide a continuous and fast degradation efficiency of the 10 mg L$^{-1}$ 4-chlorophenol which was the model contaminant by using only trace level Fe$^{II}$. The activity of Pd/NH$_{2}$-MIL-101(Cr) decreased from 100% to about 35% gradually during the six consecutive reaction cycles of 18 h. That could be attributed to the irreversible structural damage of NH$_{2}$-MIL-101(Cr). Key words:
Fabrication And Characterization Of Amidoxime-Functionalized Silica Decorated Withcopper: A Catalytic Assembly For Rapid Reduction Of Dyes, Ijaz Ahmed Khan, Muhammad Inaam-Ul-Hassan, Hazrat Hussain, Syed Mujtaba Shah, Tariq Yasin
Fabrication And Characterization Of Amidoxime-Functionalized Silica Decorated Withcopper: A Catalytic Assembly For Rapid Reduction Of Dyes, Ijaz Ahmed Khan, Muhammad Inaam-Ul-Hassan, Hazrat Hussain, Syed Mujtaba Shah, Tariq Yasin
Turkish Journal of Chemistry
In this study, amidoxime-functionalized silica decorated with copper (AFS-Cu) was fabricated and tested for its catalytic application. Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were employed to characterize its structure and morphology. The application of AFS-Cu as a catalyst for the catalytic reduction of methylene blue (MB) in aqueous media using NaBH$_{4}$ as reductant was evaluated. The ability to reuse as well as the effect of catalyst dose and pH of solution on the catalytic activity was investigated. The reduction of MB followed pseudo-first-order kinetics and the rate constant (k) was 0.6224 min$^{-1}$. …
Dispersive Liquid-Liquid Microextraction For The Isolation And Hplc-Daddetermination Of Three Major Capsaicinoids In Capsicum Annuum L., Jude Caleb, Usama Alshana, Azmi̇ Hanoğlu, İhsan Çaliş
Dispersive Liquid-Liquid Microextraction For The Isolation And Hplc-Daddetermination Of Three Major Capsaicinoids In Capsicum Annuum L., Jude Caleb, Usama Alshana, Azmi̇ Hanoğlu, İhsan Çaliş
Turkish Journal of Chemistry
Dispersive liquid-liquid microextraction (DLLME) was combined with high-performance liquid chromatography-diodearray detector (HPLC-DAD) for the extraction and quantitation of three major capsaicinoids (i.e. capsaicin, dihydrocapsaicin and nordihydrocapsaicin) from pepper (Capsicum annuum L.). Chloroform (extraction solvent, 100 μL), acetonitrile (disperser solvent, 1250 μL) and 30 s extraction time were found optimum. The analytes were back-extracted into 300 μL of 50 mM sodium hydroxide/ methanol, 45/55% (v/v), within 15 s before being injected into the instrument. Enrichment factors ranged from 3.3 to 14.7 and limits of detection from 5.0 to 15.0 μg g$^{-1}$. Coefficients of determination (R$^{2}$) and %RSD were higher than 0.9962 …
Detection Of Alkanolamines In Liquid Cement Grinding Aids By Hplc Coupled Withevaporative Light Scattering Detector, Cheng Li, Wenfang Song, Yubai Shi, Zhiwei Qing
Detection Of Alkanolamines In Liquid Cement Grinding Aids By Hplc Coupled Withevaporative Light Scattering Detector, Cheng Li, Wenfang Song, Yubai Shi, Zhiwei Qing
Turkish Journal of Chemistry
Triethanolamine (TEA), triisopropanolamine (TIPA), diethanol isopropanolamine (DEIPA) are necessary cement additives, and knowing their contents is needed for quality control and also to understand final properties of the cement. Whether it is the production of grinding aids, technical research and development or application research all involve the detection of grinding aids. This work developed a simple analytical technique for the simultaneous analysis of these alkanolamines in liquid cement grinding aids using high-performance liquid chromatography (HPLC) combined with evaporative light scattering detection (ELSD). HPLC was conducted by an XBridge C18 column (with dimensions 4.6 × 250 mm and 5 ?m particles) …
Synthesis Of Some Nh- And Nh,S- Substituted 1,4-Quinones, Ayşeci̇k Kaçmaz
Synthesis Of Some Nh- And Nh,S- Substituted 1,4-Quinones, Ayşeci̇k Kaçmaz
Turkish Journal of Chemistry
A series of NH-substituted-1,4-quinones, possessing one, two, three or not chlorine, were synthesized by the reaction between different quinones (p-chloranil (1), p-toluquinone (2), or 2,3-dichloro-1,4-naphthoquinone (3)) and (-)-cis-myrtanylamine (5) via nucleophilic reactions. Moreover, 2-bromo-1,4-naphthoquinone (4) was reacted with 2-(methylthio)ethylamine (11) to produce aminosubstituted naphthoquinones (12 and 13), bearing with bromine and not bromine. In addition, 2-bromo-1,4-naphthoquinone (4) was reacted with 4?-aminodibenzo-18-crown-6 (14) and 4'-aminobenzo-18-crown-6 (16) to yield crown-containing 1,4-naphthoquinones (15 and 17), respectively. New compounds were characterized, providing 1H NMR, 13C NMR, FTIR, MS-ESI, UV/Vis and elemental analysis.
Rhenium/Rhenium Oxide Nanoparticles Production Using Femtosecond Pulsed Laserablation In Liquid, Abdullah Kepceoğlu, Yasemi̇n Gündoğdu, Adem Sarilmaz, Mustafa Ersöz, Faruk Özel, Hamdi̇ Şükür Kiliç
Rhenium/Rhenium Oxide Nanoparticles Production Using Femtosecond Pulsed Laserablation In Liquid, Abdullah Kepceoğlu, Yasemi̇n Gündoğdu, Adem Sarilmaz, Mustafa Ersöz, Faruk Özel, Hamdi̇ Şükür Kiliç
Turkish Journal of Chemistry
In this study, rhenium/rhenium oxide nanoparticles (Re / ReO$_{3}$ NPs) have been produced for the first time in ultrapure water by using Femtosecond Pulsed Laser Ablation in Liquid (fsPLAL) method. X-Ray Diffraction (XRD) measurements and results obtained for NPs show the existence of well-crystallized peaks and preferred phases. Re NPs have hexagonal structure while ReO$_{3}$ NPs have the perovskite-like cubic crystal structures. The Re / ReO$_{3}$ ratio is also determined to be 53 / 47 with ~ 20 nm crystallite size, while pure ReO$_{3}$ crystallite sizes were measured to be ~ 25 nm. The TEM results have shown that the …
Spectroscopic Investigation Of Defect-State Emission In Cdse Quantum Dots, Gülhan Güleroğlu, Caner Ünlü
Spectroscopic Investigation Of Defect-State Emission In Cdse Quantum Dots, Gülhan Güleroğlu, Caner Ünlü
Turkish Journal of Chemistry
CdSe quantum dots are the most studied Cd-based quantum dots with their high quantum yield, high photostability, narrow emission band, and easy synthesis procedure. They are frequently used to develop light emitting diode (LED) due to their unique photo¬physical properties; however, their narrow emission band causes a challenge to design white LEDs because white light emission requires emission in multiple wavelengths with broad emission bands. Here in this study, we developed CdSe quantum dots with a narrow band-edge emission band and broad defect-state emission band through a modified two-phase synthesis method. Our results revealed that defect-state emission is directly linked …
Graphene Preparation And Graphite Exfoliation, Ahmed Moosa, Mayyadah Abed
Graphene Preparation And Graphite Exfoliation, Ahmed Moosa, Mayyadah Abed
Turkish Journal of Chemistry
The synthesis of Graphene is critical to achieving its functions in practical applications. Different methods have been used to synthesis graphene, but graphite exfoliation is considered the simplest way to produce graphene and graphene oxide. In general, con-trolling the synthesis conditions to achieving the optimum yield, keeping the pristine structure to realize on-demand properties, mini-mum layers with the smallest lateral size, and minimum oxygen content are the most obstacles experienced by researchers. Each applica¬tion requires a specific graphene model, graphene oxides GO, or even graphene intercalated compounds (GIC) depending on synthesis conditions and approach. This paper reviewed and summarized the …
Synthesis And Biological Evaluation Of New Pyrazolebenzene-Sulphonamides As Potentialanticancer Agents And Hca I And Ii Inhibitors, Mehtap Tuğrak, Hali̇se İnci̇ Gül, Hi̇roshi̇ Sakagami̇, Rüya Kaya, İlhami̇ Gülçi̇n
Synthesis And Biological Evaluation Of New Pyrazolebenzene-Sulphonamides As Potentialanticancer Agents And Hca I And Ii Inhibitors, Mehtap Tuğrak, Hali̇se İnci̇ Gül, Hi̇roshi̇ Sakagami̇, Rüya Kaya, İlhami̇ Gülçi̇n
Turkish Journal of Chemistry
Cancer is a disease characterized by the continuous growth of cells without adherence to the rules that healthy normal cells obey. Carbonic anhydrase I and II (CA I and CA II) inhibitors are used for the treatment of some diseases. The available drugs in the market have limitations or side effects, which bring about the need to develop new drug candidate compound(s) to overcome the problems at issue. In this study, new pyrazole-sulphonamide hybrid compounds 4-[5-(1,3-benzodioxol-5-yl)-3-aryl-4,5-dihydro-1Hpyrazol- 1-yl]benzenesulphonamides (4a - 4j) were designed to discover new drug candidate compounds. The compounds 4a - 4j were synthesized and their chemical structures were …
Synthesis And Characterization Of Magnetic Nanocomposite For In Vitro Evaluation Of Irinotecan Using Human Cell Lines, Tuba Tarhan
Synthesis And Characterization Of Magnetic Nanocomposite For In Vitro Evaluation Of Irinotecan Using Human Cell Lines, Tuba Tarhan
Turkish Journal of Chemistry
In this study, magnetic O-carboxymethyl chitosan (MOCC) nanocomposite was synthesized and characterized as a drug delivery system for loading the anticancer drug irinotecan (CPT-11). To increase the drug loading capacity, MOCC was synthesized by linking the carboxyl group functionally to chitosan. Also, several critical factors such as concentration, the dose of MOCC, and contact time for optimum drug loading condition were investigated. The loading capacity of CPT-11 onto MOCC was calculated as 5.6 mg/g, and the loaded drug concentration was calculated as 0.04787 mM at pH value of 5. Besides, the cytotoxic properties of MOCC, CPT- 11 loaded MOCC (MOCC-CPT-11), …
Removal Of Cod, Aromaticity And Color Of A Pretreated Chemical Producing Industrial Wastewater: A Comparison Between Adsorption, Ozonation, And Advanced Oxidation Processes, Elçi̇n Güneş, Deni̇z İzlen Çi̇fçi̇, Ali̇ Riza Di̇nçer, Yalçin Güneş
Removal Of Cod, Aromaticity And Color Of A Pretreated Chemical Producing Industrial Wastewater: A Comparison Between Adsorption, Ozonation, And Advanced Oxidation Processes, Elçi̇n Güneş, Deni̇z İzlen Çi̇fçi̇, Ali̇ Riza Di̇nçer, Yalçin Güneş
Turkish Journal of Chemistry
A wide range of products are produced in the chemical producing industry such as textile dyes, chemicals, printing dyes and chemicals, paper chemicals, electrostatic powder dyes, and optical brighteners. The aim of this study is to investigate the treatability of chemical oxygen demand (COD), aromaticity, and color in the wastewater of this sector, where highly complex chemicals are used. Most of the studies in the literature are related to the treatment of synthetically prepared dyed wastewater. This study is important as it is carried out with real wastewater and gives results of many treatment methods. In the study, COD, UV-vis …