Có 100+ tài liệu thuộc chủ đề "Journal of Chemistry"
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Multiwall carbon nanotube paste electrode as a sensor for sensitive determination of deferasirox in the presence of uric acid: application for the analysis of. Abstract: In this work, the electrochemical oxidation of deferasirox at a multiwall carbon nanotube paste electrode (MWCNTPE) was described. The electrochemical behavior of deferasirox was studied using cyclic voltammetry and chronoamperometry techniques and parameters such as...
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The effects of pH, adsorbent dose, contact time, and initial dye concentration on the adsorption efficiencies were investigated. Adsorption of the five dyes was found to obey the Langmuir isotherm model and was endothermic. E values obtained from the Dubinin–Radushkevich isotherm showed that the adsorption mechanism was chemical in nature. Furthermore, dyes prevent sunlight from penetrating into the water and...
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All the new synthetic compounds (20–44) were evaluated with regard to their α-glucosidase activity. All the new compounds (20–44) were evaluated for their in vitro antimicrobial activity for nine test microorganisms. The reaction sequences used for the synthesis of target compounds 20–44 are outlined in the Figure. The structures of compounds 20–44 were identified by means of 1 H NMR,....
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Abstract: In the present study, two new donor–acceptor–donor-type molecules were synthesized and the electro-optical properties of the resulting monomers and their corresponding polymers were investigated. Thiophene was selected as the donor unit and cycloheptyl- and cyclooctyl- substituted benzimidazoles were used as the acceptor units. The optical band gap values of the polymers were 1.62 eV and the polymer films changed...
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Adsorptive properties of mesoporous silica modified with Lewis base molecule and its application in the preconcentration of Cu(II), Co(II), and Cd(II) from. Infrared spectroscopy of the adsorbent material demonstrated N-H stretching bonds related to primary amines existing in the ligand molecule, elemental analysis revealed the presence of 0.132 mmol g − 1 of nitrogen, scanning electron microscopy indicated globularly shaped...
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Physicochemical characterization of different cellulose polymorphs/graphene oxide composites and their antibacterial activity. Abstract: In order to investigate the interaction of graphene oxide (GO) with different cellulose polymorphs (I and II), we synthesized cellulose (I and II)/GO composites using the sonication method. Interestingly, no new peaks were observed in the FT-IR pattern of the cellulose (I and II)/GO composites, indicating that...
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The binding of quaternized ZnPc and CoPc (Q-ZnPc and Q-CoPc) with calf thymus DNA was investigated by UV-Vis spectrophotometric methods and thermodynamics. The mixtures of Q-ZnPc or Q-CoPc and DNA solutions were used to determine the change in the thermal melting temperature of DNA with the thermal denaturation profile. Thermodynamic parameters that show the spontaneity of the reactions between DNA...
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It is well known that the determination of the absorption, distribution, metabolism, and elimination of a drug in the human body is a very complex process and needs highly sophisticated methods and tools. 1 − 7 During these processes, the investigation of a correlation between concentration and time of the initial-loaded drug in the bloodstream and in the tissues of...
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Ligand binding constants of the cucurbit[7]uril predicted with molecular docking:. The binding free energy maps were correlated by Contact, Grid-Based, Hawkins GB/SA, and AMBER docking scores obtained from UCSF DOCK software. This phenomenon is widely used, for example in pharmaceutics to control the transport of the drug molecule to the corresponding receptor (controlled drug delivery: long acting local anesthetics, etc....
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The PtNPs/CuPc-CNT/GCE surface is characterized by scanning electron microscopy, transmission elec- tron microscopy, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. PtNPs/CuPc-CNT/GCE show higher catalytic activity than CNT/GCE, CuPc/GCE, and CuPc-CNT/GCE in oxygen reduction with four electron transfers.. Improving catalysts would thus significantly improve effect on the efficiency of the fuel cell, 35 − 37 and in this respect...
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Schiff base of isoniazid and ketoprofen: synthesis, X-ray crystallographic, spectroscopic, antioxidant, and computational studies. The Schiff base of isoniazid with ketoprofen is synthesized in this research. Infrared spectroscopy (IR) and X-ray diffraction (XRD) analysis of the crystal packing proved the formation of the Schiff base and the existence of N-H. O hydrogen bonds between the hydrogen-bonded dimer of the Schiff...
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1 H NMR (CDCl 3 , 500 MHz, δ / ppm): 7.65 (d, J = 8.0 Hz, 2H, H - 2. 7.50 (d, J = 8.5 Hz, 2H, H - 3. 3.78 (d, J = 11.6 Hz, 1H, H a - 2. 3.22 (q, J = 6.1 Hz, 2H, H - 1. 2.74 (t, J = 11.1 Hz, 1H, H...
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The effects of surface-modified silica (mod-SiO 2 ) nanoparticles on the superhydrophobicity and corrosion resistance of polystyrene (PS)/mod-SiO 2 fiber coatings were evaluated. The incorporation of the SiO 2 nanoparticles endows PS fibers with rough surfaces exhibiting a water contact angle (WCA) of 165. The surface wettability, corrosion resistance, and their relation to the inorganic content in the PS fibers...
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Highly efficient catalytic degradation of low-density polyethylene Using a novel tungstophosphoric acid/kaolin clay composite catalyst. 1 Institute of Chemistry, University of the Punjab, Lahore, Pakistan. Abstract: In order to take advantage of the Brønsted acidity of tungstophosphoric acid (TPA) and Lewis acidity of kaolin, TPA-loaded kaolin catalysts with varying percentages of TPA (10–50 wt. Fourier transform infrared spectrometer, X-ray diffractometer,...
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Photocatalytic degradation of the herbicide quinclorac in water using Mn (III) salen and solar light. In this study, the photocatalytical degradation of QNC using [(R,R)-(N,N ′ -bis tetra-tert-butylsalicylidene)-1,2-cyclohexanediaminato] manganese(III) acetate (Mn (III) salen) and H 2 O 2 was performed under natural sunlight irradiation and a 91% degradation rate was achieved in neutral pure water in 240 min. The identified...
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4-chlorophenol under visible light. The results indicated that modified TiO 2 nanocrystals possessed only the anatase phase and MPc-TiO 2 photocatalysts with loading amount of dye ca. Additionally, the effect of different substituent groups (such as aromatic vs. Phenol and related compounds are important in industry and they are commonly found in the environment. OH) and singlet oxygen species (...
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One-pot synthesis of substituted 4 H -chromenes by nickel ferrite nanoparticles as an efficient and magnetically reusable catalyst. A one-pot, three-component reaction is reported for the synthesis of substituted 4H -chromenes in the presence of NiFe 2 O 4 MNPs as a reusable catalyst in a green solvent at 40 ◦ C under clean, efficient, and mild conditions. In recent...
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Environmental impact assessment of natural radioactivity and heavy metals in drinking water around Akkuyu Nuclear Power Plant in Mersin Province. Abstract: The aim of this study was to determine natural radioactive and heavy element concentrations in Mersin drinking water samples before the commissioning of the Akkuyu nuclear power plant and to collect data for possible environmental contaminations in the future....
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[AM7/VP10/0.1%/CTs]. Abstract: In this work, we are interested in the quaternization of poly(acrylamide-co-4-vinylpyridine) [AM7/VP10/0.1%/]. The obtained copolymer poly(acrylamide-co-(N-methyl-4-vinylpyridinium tosylate)) [AM7/VP10/0.1%/CTs] has been characterized by 1 H NMR and UV-Vis spectroscopy. Several important parameters in the flocculation process, such as pH of water, initial turbidity, and flocculant concentration, were utilized for the optimization of wastewater treatment. Flocculation experiments were carried out...
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Synthesis of some ketones via nano-nickel oxide catalyzed acylation of arylzinc reagents. Abstract: Nano-NiO catalyzed acylation of mixed (methyl)(aryl)zincs with aromatic acyl halides in THF at room temperature provides a new facile route for aryl–aroyl coupling. Among NiCl 2 .L 2 and NiCl 2 .L (L = monodentate and bidentate phosphine ligand) catalysts, the lower catalyst loading of NiCl 2...