tTiO2nanoparticles exhibiting large surface area were synthesized by the hydrothermal treatment ofthe water soluble titanium(IV) bis(ammoniumlactato) dihydroxide (TALH) complex in the presence ofaqueous ammonia. The obtained powders were... more
tTiO2nanoparticles exhibiting large surface area were synthesized by the hydrothermal treatment ofthe water soluble titanium(IV) bis(ammoniumlactato) dihydroxide (TALH) complex in the presence ofaqueous ammonia. The obtained powders were characterized by X-ray diffraction, scanning electronmicroscopy, diffuse reflectance spectroscopy, and nitrogen adsorption. Their photocatalytic activitieswere assessed by the photocatalytic hydrogen evolution from aqueous EDTA solutions. The effects of Pt-and photocatalyst loading, EDTA concentration, light intensity, pH, and temperature on the H2evolutionrate were studied in detail. The highest reaction rate was obtained for the TiO2photocatalyst loaded with0.4–0.5 wt.% Pt at pH 5 and this was found to be 18 and 34% higher than that of TiO2P25 and TiO2UV100,respectively. The reaction rate increased substantially with increasing the temperature from 5◦C to 45◦C.
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A cell lysis mill, typically used for the breakdown of biological structures in microbiological and biochemical studies, was used as a tool for rapid, solvent-free and general synthesis of short-and long-chain substituted zwitterionic... more
A cell lysis mill, typically used for the breakdown of biological structures in microbiological and biochemical studies, was used as a tool for rapid, solvent-free and general synthesis of short-and long-chain substituted zwitterionic meta-and para-aminobenzoquinones, never previously prepared under solvent-free conditions. Rapid agitation and self-heating in the lysis mill enabled thermally-demanding reactions without external solvent, providing yields comparable to those obtained by conventional solution chemistry, ball milling and melt chemistry. The lysis mill is also suitable for coordination-based reactions, demonstrated by the mechanosynthesis of a mononuclear Ni(II) meta-benzoquinonemonoimine complex.
Antioxidants are used to increase the shelf life of food and oils. The most common extraction method of antioxidants from natural sources is the use of organic solvents, like methanol and ethanol. Evaporation of all the organic solvent is... more
Antioxidants are used to increase the shelf life of food and oils. The most common extraction method of antioxidants from natural sources is the use of organic solvents, like methanol and ethanol. Evaporation of all the organic solvent is necessary to prevent health diseases. In this study, we present a new " organic solvent-free " method to extract antioxidants, which uses canola oil as extraction solvent to incorporate natural antioxidants from oregano and ginger without the use of organic solvent. The oil solvent extraction capacity was assessed by assays of oxygen radical absorbance capacity method for hydrophilic (721.9 ± 10.5 and 89.0 ± 2.5 µmol TE g-1 to canola oil with oregano and ginger, respectively) and lipophilic (118.8 ± 7.4 and 48.2 ± 9.7 µmol TE g-1 to canola oil with oregano and ginger, respectively) compounds, oxidation test (Oxitest ®) (1,434 and 1,018 minutes to canola oil with oregano and ginger, respectively) and thiobarbituric acid reactive substances (0.01 ± 0.02 and 0.11 ± 0.06 mg MA g-1 to canola oil with oregano and ginger, respectively). Results provide evidence of the efficiency of canola oil as antioxidants extractor. Nine antioxidant compounds from canola oil incorporated with antioxidants compounds were identified using high performance liquid chromatography tandem mass spectrometry.
Objective: To optimize microwave assisted solvent free synthesis of Schiff bases of substituted benzaldehydes and aromatic amines (3-amino-6-bromo/Iodo-2-phenylquinazoline-4(3H) one) by using wetting reagent 000-ethoxyethanol. The goal of... more
Objective: To optimize microwave assisted solvent free synthesis of Schiff bases of substituted benzaldehydes and aromatic amines (3-amino-6-bromo/Iodo-2-phenylquinazoline-4(3H) one) by using wetting reagent 000-ethoxyethanol. The goal of this study was to investigate the % yields and time required for the completion of reaction for Schiff bases by microwave and conventional conditions. Methods: Schiff bases have been synthesized by condensation of substituted various aromatic substituted benzaldehydes (0.001mol) with 3-amino-6-bromo/Iodo-2-phenylquinazoline-4(3H) one (0.001mol) by two different methods as by conventional method (Heating) & Microwave accelerated synthesis by using wetting reagent 000-ethoxyethanol. The reaction time for conventional method and microwave method is in the range of 4-7 hr. and 3-5 min. respectively. The % yield for conventional method and microwave method is in the range of 56-77%. and 77-90% respectively. All synthesized compounds were characterized by elemental analyses, IR spectroscopy, mass spectroscopy, 1H NMR and 13C NMR spectroscopy. Results: The simple microwave assisted solvent-free method for the synthesis of Schiff bases using a wetting reagent (-ethoxyethanol) led to improvement in the yield of all the target compounds with reduction in their reaction byproducts & substantially reduced the overall process time as expected as compare to traditional method. Excellent isolated yields (up to 90%) were attained within short reaction times (typically, 3 min.) when the reaction was performed under microwaves irradiation. Conclusion: Compared with traditional methods, these methods are more convenient and reaction can be carried out in higher yield, short reactions time and milder conditions, without generation of pollution, elimination of side products and safer to analyst. From these features present methods can be correlated for safer and efficient synthesis of other products.
