Có 40+ tài liệu thuộc chủ đề "Journal of Chemistry"
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DNA binding abilities of the complexes were revealed using a UV-Vis spectrophotometer with the absorption titration and competitive binding techniques. The results obtained from the cytotoxicity experiments are especially promising for further research, which must be carried out for the evaluation of the studied complexes as anticancer drugs.. 2 This is also true for metal-containing drugs because of the metal-binding...
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The adsorption process was consistent with the Langmuir model for both metal ions with high R 2 and low χ 2 values for both Pb(II) and Cd(II). Of these alternative methods, adsorption is one of the most cost effective methods for removal of the heavy metal ions in aqueous media. The search for new alternative cost-effective adsorbents that have good...
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Adsorption of Cu(II) on three adsorbents, Fe 3 O 4 /Ni/Ni x B nanocomposite, carob (Ceratonia siliqua), and grape seeds: a comparative study. Abstract: A novel adsorbent Fe 3 O 4 /Ni/Ni x B nanocomposite was synthesized and used for the adsorption of copper.. The surfaces and the elemental compositions of the adsorbents were characterized by SEM-EDX. The Langmuir, Freundlich,...
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Palladium nanoparticles entrapped in melamine-formaldehyde resin microparticles for Mizoroki–Heck reactions. X-ray diffraction (XRD) and transition electron microscopy (TEM) showed that the palladium nanoparticles entrapped in the MFR microparticles dispersed much more homogeneously than those adsorbed on the MFR microparticles. Mizoroki–Heck reaction catalysis results demonstrated that the entrapped palladium catalyst had similar catalytic activity with the adsorbed palladium catalyst. Key words:...
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Catalytic application of 1,3,5-triazine-pentaethylenehexamine polymer-supported palladium nanoparticles in the convenient reduction of nitroarenes with sodium. Abstract: The catalytic activity of 1,3,5-triazine-pentaethylenehexamine (TAPEHA) polymer-supported Pd nanoparti- cles was investigated in the reduction of nitro arenes to the corresponding amines by NaBH 4 or N 2 H 4 .H 2 O. Optimized reaction conditions for both systems were successfully tested on 20...
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The multiple effects of organoclay and solvent evaporation on hydrophobicity of composite surfaces. Abstract: A superhydrophobic high-density polyethylene (HDPE)/organoclay composite material with a water-static contact angle of ∼ 162 ◦ and low hysteresis (7. This one- step method consists of the insertion of organoclay, produced through cation exchange with cetyltrimethylammonium bromide (CTAB), in the polymer matrix at 120 ◦ C...
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The absorption and fluorescence excitation wavelengths of the studied silicon(IV) phthalocyanines were blue-shifted when they converted to their µ-oxo dimers. The fluorescence quantum yield and lifetime values decreased with the substitution of the tetraalkylthio groups on the phthalocyanine ring. The singlet oxygen generation of the studied silicon(IV) phthalocyanines increased with the formation of the µ -oxo bridge between two phthalocyanine...
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Thus, removal of phenol and resorcinol was studied using a polyethersulfone ultrafiltration (PES-UF) membrane. Membrane–solute interactions were found to play an important role during the process, suggesting the adsorption of the target compounds on the PES-UF membrane. The adsorption equilibrium data fit the Langmuir model. In addition, the adsorption mechanism was evaluated by the intraparticle diffusion model and appeared to...
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Cyclic voltammetry behavior of tamoxifen in different electrolytes,. electrochemical characterization, and its measurement by differential pulse anodic voltammetry. Abstract: Cyclic voltammetry (CV) was performed on tamoxifen (tam) using different electrodes and in various acidic electrolytes containing 10% v v − 1 methanol (MeOH). Tam oxidation was found to be most favorable using 0.1 mol L − 1 H 2 SO...
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Methanolysis of Jatropha curcas oil using K 2 CO 3 /CaO as a solid base catalyst. In the present study, the methanolysis of high free fatty acid (FFA) Jatropha curcas oil in a transesterification reaction using K 2 CO 3 /CaO solid base catalyst was studied. The various reaction parameters in the transesterification reaction were also discussed. The efficiency of...
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Investigation of photoinduced polymerization of doxycycline-imprinted hydrogels:. effect of template on initiator reactivity, conversion, and reaction rate. Abstract: Photopolymerization kinetics of doxycycline hyclate (DOX)-imprinted hydrogels were monitored by real-time Fourier transform infrared spectroscopy and differential photocalorimetry. The polymerization was achieved at two different initiator concentrations. The conversion and reaction rate were calculated as a function of the molar ratio of...
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Synthesis of PdS/ZnS–CdS-type photocatalysts using ZnS as sulphide source. Abstract: In this work, a new method for the growth of large CdS crystals into PdS/ZnS–CdS-type photocatalysts is presented. In order to accomplish this, in the first stage zinc sulphide was synthesised and hydrothermally crystallised.. In the second stage, after PdS decoration, the recrystallised zinc sulphide was utilised as sulphur source...
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Abstract: Novel 1-substituted 3-(p-isopropylphenyl)-5-phenylformazans (3a–g) were synthesized and characterized by elemental analysis, 1 H NMR, and FT-IR techniques and UV-visible spectroscopy. Antiproliferative activities of 3a–g against HeLa and C6 cells were determined using the BrdU cell proliferation ELISA assay. The effects of substituents (–H, –CH 3 , and –I) and their positions (ortho, meta, and para) on the antiproliferative activities...
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Separation and recovery of gallium(III) ions from aqueous phase by liquid–liquid extraction using a novel extractant, Cyphos IL 101. Abstract: The present study describes the extraction behavior of gallium(III) using a novel ionic liquid trihexyl(tetradecyl) phosphonium chloride (Cyphos IL 101) diluted with kerosene from acidic chloride medium. The extraction of gallium was found to depend on the hydrochloric acid concentration...
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Impurity profiling of morphine by liquid chromatography-heated electrospray ionization mass spectrometry (LC-HESI-MS). Systematic optimization of the chromatographic conditions was carried out using design of experiments. Fragmentation patterns of the eluted compounds under optimized mass spectrometry conditions indicated that all detected impurities are structurally related to morphine.. 4 − 6 Our previous work demonstrated that profound understanding of impurity profile is...
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Investigation of the photophysical and photochemical behavior of substituted zinc phthalocyanines and their water-soluble quaternized derivatives. All studied zinc(II) phthalocyanine complexes generated high singlet oxygen, especially in dimethylsulfoxide, and these properties make them potential photosensitizers for use in the photodynamic therapy of cancer. The effects of the position and quaternization of the substituents on the photophysical and photochemical properties were...
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Fluorescence response of NC-Dots CHIT in the presence of mercury was evaluated and compared with that of the polyethylene glycol passivated C-Dots P EG . This sensing strategy using NC-Dots CHIT displayed a wide linear working range from 1.25 µ g/mL to 43.54 µ g/mL with a detection limit of 1.41 µ g/mL. The fluorescence of C-Dots P EG did...
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Fe(II)-montmorillonites. Abstract: The objective of the current effort was to determine the efficacy of Fe(II)-montmorillonite (Fe(II)-MMT) as an adjuvant for specific targeted adsorption of phosphate. Specifically, Fe(II)-MMT was studied to combat hyper- phosphatemia and anemia arising from chronic renal failure. The adsorption of phosphate over time, pH, and initial concentration was studied. The experimental results demonstrated the adsorption time was...
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Ultrasound-assisted surfactant/ionic liquid aqueous two-phase system extraction prior to high performance liquid chromatography for the determination of. tetracyclines in milk and honey samples. Abstract: In this work, an ultrasonic-assisted surfactant/ionic liquid aqueous two-phase system (ATPS) extraction method was developed to extract six tetracycline antibiotics from food samples before their chromatographic determina- tion using high performance liquid chromatography. The parameters including...
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The results showed that the adsorption kinetics and isotherm data for both adsorbates followed a pseudo-second-order model and the Freundlich model, respectively. Studies of intra- particle diffusion and Dumwald–Wagner models indicated that the adsorption occurred in a complex mechanism where the intraparticle diffusion stage was not the only rate-determining step for both adsorbates. Thermodynamic studies showed that the adsorption process...