Research Journal of Chemistry and Environment

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Research Journal of Chemistry and Environment

Simple method for surface modification of Iron oxide nanoparticles with Silica and Gold

Fathi Fereshteh*, Seied Sadjadi Mir Abdollah and Farhadyar Nazanin

Iron oxide magnetic nanoparticles have special properties such as stability, biocompatibility and high magnetic saturation that caused to use them for bio-applications. To avoid of aggregation of magnetic nanoparticles, their surface must be modified by coating materials. In this paper, we focused on synthesis of iron oxide(IO) nanoparticles with co-precipitation method and coating of them with PVP, SiO2 and Au. The FT-IR, XRD, TEM, SEM and EDX were used for characterization of nanoparticles.

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Synthesis and characterization of 2-[2-(3,5-dialkyl-2,6-diphenylpiperidin-4-ylidene) hydrazinyl]-4-phenylthiazole and 2-[2-(3-alkyl-2,6-diphenylpiperidin-4-ylidene) hydrazinyl]-4-phenylthiazole compounds and their biological activities

Venugopal Sivasankaran, Dhandayutham Saravanan*, Manivachagam Chandrasekaran and Gnanaprakasam Adaikala Raj

In the present study, a new series of 2-[2-(3,5-dialkyl-2,6-diphenylpiperidin-4-ylidene) hydrazinyl]-4-phenyl thiazole and 2-[2-(3-alkyl-2,6-diphenylpiperidin-4-ylidene)hydrazinyl]-4-phenylthiazole compound are synthesized. The chemical structures were confirmed by means of IR, 1H-NMR, 13C-NMR and mass spectral data. The compounds were screened for antibacterial and antifungal activity and show good antibacterial and antifungal activity.

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Liquid- Liquid extraction and spectrophotometric determination of tellurium (IV) by using thio-ligand: analysis of alloys and chalcogenides

Waghmode Duryodhan P.

A sensitive spectrophotometric method has been developed for the determination of tellurium(IV) by using furfuraldehyde thiocarbohydrazone (FATCH) as chromogenic reagent. The present method deals with the tellurium(IV)-FATCH complex formed in the 3.7 M hydrochloric acid medium with 5 mL of 0.02 mol L-1 FATCH and 5mL chloroform. The absorbance of tellurium(IV)-FATCH complex was recorded at 395 nm against reagent blank. The beer’s law was obeyed up to 60-120 µg mL-1 of tellurium(IV) and optimum concentration range is 40-120 µg mL-1 of tellurium(IV) as evaluated by Ringbom’s Plot. The molar absorptivity and Sandell’ sensitivity of tellurium(IV)–FATCH complex in chloroform are 7.8×103 L mol−1 cm−1 and 0.0162 μg cm−2 respectively.

The stoichiometry of tellurium(IV)-FATCH complex was 1:2 established from Mole ratio method, Job’s continuous variation method and Slope ratio method. The complex is stable for more than 48 h. The interfering effects of various cations and anions were also studied and selectivity of method enhanced by using suitable masking agents. The reproducibility of the method checked by five replicate analysis of 100 µg of tellurium(IV) in 25 mL of final solution having absorbance of tellurim(IV)- FATCH complex is 0.61 with RSD 1.2 %. This method can be applied for the determination of tellurium (IV) in synthetic mixture of corresponding alloy’s, binary, ternary and chalcogenides samples.

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Synthesis and characterization of CaCO3-SiO2 core-shell nanoparticles with PA6 nanocomposites

Barman Ghanshyam, Sonawane Shriram S.*, Wasewar Kailas L., Rathod Ajit P. and Parate Vishal R.

CaCO3-SiO2 core-shell nanoparticles were synthesized by miniemulsion polymerization process. The PA6 polymer is compounded with CSNP (CaCO3-SiO2 core-shell nanoparticles) in different proportions to enhance the viscoelastic, thermo mechanical and thermal properties. CSNP has an advantage over conventional nanoparticles. XRD, SEM, TGA, DSC and DMA analysis confirmed improvement in above properties due to the good dispersion mechanism of CSNP in PA6 polymer. The stiffness is improved by 6%, 15%, 48% and 60% with loading of 1, 3, 5 and 7% CSNP in comparison to neat PA6. This excellent improvement is due to resistance provided by core and shell part of the nanoparticle individually to chain mobility within the polymer. The thermal stability is improved by 1%, 2%, 5% and 8% in comparison to neat PA6.

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Studies on density, viscosity and excess molar volumes of binary mixtures of anisaldehyde with methanol as a function of composition at temperature 298.15, 308.15 and 318.15 K

Maulage Satish B.*, Machale R.G. and Naikwade S.D.

In the present study, density and viscosity of binary mixtures of anisaldehyde with methanol as function of composition at 298.15, 308.15 and 318.15 K were studied. By using the experimental data on viscosity measurements, viscosity deviations dη, excess molar volumes VE and excess free energies of activation of viscous flow ΔG*E have been determined. Viscosity deviations, excess molar volumes and excess free energies of activation of viscous flow were correlated by Redlich-Kister polynomial equation.

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Numerical Indicators of Absorption Spectra in Herbal Formulation Quality Assessment

Vladimir Koldaev*, Artem Manyakhin, Olga Zorikova, Petr Zorikov and Alexander Belov

The study is dedicated to absorption spectrophotometry of herbal formulations. The objective is to develop the methodology for determining numerical indicators of the turning points, steps and maximums of the absorption spectrum (AS) lines to evaluate the quality of herbal extractions. Ultraviolet absorption spectrophotometry of the extractions was prepared in different conditions from garden sage leaves and hawthorn berries. AS have been processed with proprietary software calculating the wavelengths, optical densities, first derivatives in the turning points, steps, maximums and rates of the absorption bands. For the purposes of statistical processing Student’s t-test and Z-Sign test have been applied. When the conditions for preparing the extractions were changed, the variations of values of the derivatives in the turning points and steps proved to be most evident and the changes of values of optical densities and wavelengths in AS maximums were less expressed. Significant differences from the standard AS numerical indicators were observed in cases when the extractions were prepared under varying conditions or with substandard raw material quality giving grounds for rejecting the extracts under investigation.

Due to the sufficient pharmaceutical precision, low associated costs and the possibility to obtain the results quickly, it seems advisable that the numerical indicators under investigation should be used for the purpose of spectrophotometric fast analysis in the course of evaluating the quality and authenticity of herbal formulations. The aggregate of the obtained numerical indicators represents a spectrophotometric passport of the extraction and can be included in the regulatory documents for pharmaceutical drugs of plant origin.

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Adsorption of Color, COD and AOX from Paper Mill Effluent onto Low Cost Mustard Stalks Activated Carbon

Ullhyan Anupa

Paper industry effluent contaminants our environment as well as disturbed ecosystem. This paper provides a solution for wastewater treatment and solid waste disposal problem in economically and environmentally friendly ways. For this purpose, mustard stalks an agriculture residue as activated carbon was evaluated for color, COD and AOX removal of paper industry effluent. Activated carbon was developed from the chemically treated mustard stalks, the obtained precursor than crushed and sieved to the desired particle size. Characterization of mustard stalks activated carbon having surface area 129 (m2/g) and methylene blue number 290 (mg/g) confirms better adsorption capacity. Batch experiments were performed at various process parameters. Adsorbent dose varies from 02 -12 g l-1 and pH (2-8) at time intervals of 10-140 min and color concentration 200 to 1,400 (mgl-1 Pt-Co).

Adsorption equilibrium results of mustard stalks activated carbon (MSAC) show that a maximum removal of color (96 %), COD (97 %) and AOX (90 %) was achieved at an adsorbent dose of 10 g l-1 at pH 2 of initial concentration 1,120 (mgl-1 Pt-Co) in 120 min. Pseudo first order kinetic with constant value k (0.0227, 0.0201, 0.0258) and Freundlich adsorption isotherm were best fitted to experimental data in terms of color, COD and AOX have higher R2 (0.986, 0.976, 0.973) value based on the batch equilibrium data. This study concludes that MSAC as an adsorbent have ability to reduce the maximum color COD, AOX of the paper mill effluent.

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Synthesis, characterization, DNA photocleavage and antibacterial study of a novel dehydroacetic acid based hydrazone Schiff’s base transition metal complexes

Saini S., Pal R., Gupta A.K.* and Beniwal V.

The synthesis of a series of some new tridentate Schiff’s base complexes of Cu(II), Ni(II), Co(II), Mn(II), Zn(II) (M: L=1:2, 1:1) has been achieved by the reaction of pyrimidine hydrazide with dehydroacetic acid (DHA) in ethanol under reflux. All the compounds were characterized on the basis of elemental analysis, UV-Visible, 1H ,13C-NMR, FTIR spectroscopy and mass spectrometry. The FTIR spectral data suggests that azomethine N and enolic O atoms are involved in coordination with metal ion.

The mass spectrum of the complexes confirmed the formation of metal ligand bonding in 1:1 and 1:2 stoichiometric ratios. All synthesized compounds were screened for DNA photocleavage potential using plasmid DNA by gel electrophoresis method. Synthesized compound was also screened for antibacterial potential against gram (+) and gram (-) bacteria using Oxacillin as a reference standard. It has been found that activity enhanced significantly upon coordination.

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