Volume-11 ~ Issue-8 ~ August-2018

Abstract: Quantitative investigation of two harmful heavy metals namely copper (Cu) and zinc (Zn) in the water of four most popular lakes of Dhanbad city namely: Bekar Badh lake, Ranitalab lake, Sri Sri Kali Mandir lake, and Bartand Badh lake have been carried out using atomic absorption spectroscopy (AAS). Calibration of the instrument was done using the standard solution. We have compared the obtained data of concentration of Zinc and Copper metal in water of these lakes with the standard maximum permissible limiting value set by Bureau of Indian Standards (BIS) IS:10500 Drinking Water Specification, 2004, considered fit for drinking by humans. The analysis showed that the concentration of heavy metals copper and zinc in four of the above mentioned lakes are much lower than.........

Keywords: Analysis, Concentration, Heavy metals, Atomic absorption spectroscopy (AAS)

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Abstract: Surfactants enhances complexation of triphenylmethane dyes by formation of a new dye : surfactant complex which is as an intermediate stable complex. Addition of quaternary salts of surfactants to the deeply colored solution of dyes causes a marked change in its λmax. The absorption spectra of Pyrocatechol Vilet, PCV; a triphenylmethane dye , has been studied in the presence as well as in the absence of cationic surfactant, Cetyl Trimethyl Ammonium Bromide, CTAB . At different pH values ranging from pH 1.00 to 12.00, the spectra is studied. Hypsochromic shift is observed in the absorption spectra in the presence of surfactant. Dissociation constant has been evaluated both in the.........

Keywords: Triphenylmethane Dye, Surfactant, Modified reagent, Hypsochromic Shift

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Abstract: Hevea braciliensis is a tree discharged white colored latex that is utilized to produce natural rubber. Generally, two types of rubber sheet such as Ribbed Smoked Sheet (RSS) and Air Dried Sheet (ADS) are produced in the world. Ribbed Smoked Sheet is the most popular than the Air Dried Sheet which is used for the production of huge end products like tyres, condoms, surgical gloves, balloons, adhesive, rubber band, carpet backing etc. It is produced by applying some steps named latex collection by tapping process, preservation, coagulation, sheet formation and smoke drying. Three samples of Ribbed Smoked Sheet were collected from the hilly area of Chattogram. Nine metals viz. Chromium (Cr), Cobalt (Co), Nickel (Ni), Manganese (Mn), Iron (Fe), Copper (Cu), Zinc (Zn), Lead (Pb.........

Keywords: Ribbed smoked sheet, assessment, heavy metals, Chittagong, rubber, production

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Abstract:Computational chemistry [1] is a branch of chemistry that uses the principles of computer science to assist in solving chemical problems. It uses the results of theoretical chemistry, incorporated into efficient computer programs, to calculate the structures and properties of molecules and solids. The programs used in computational chemistry are based on many different quantum chemical methods that solve the molecular Schrodinger equation associated with molecular Hamiltonian. We use Ab-initio method for finding transition state of a bimolecular reaction. An Ab-initio method [2] is an approach to calculate energy and many other properties of molecule by solving Schrodinger equation. The simplest type of Ab-initio electronic structure............

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Abstract: Chalcones, (E)-N-(4-(4,6-dichloro-1,3,5 –triazin-2-ylamino) phenyl)-3-(4-methoxyphenyl) acrylamide (4a-c) have been prepared according to Claisen-Schmidt condensation. Further these chalcones (4a-c) on reaction with malononitrile affords cyanopyridines (5a-c) and on reaction with hydrazine hydrate affords pyrazole (6a-c) respectively. The constitutions of newly synthesised compounds have been characterized on the basis of their IR and 1H NMR, 13C NMR spectral data.These synthesized compounds have been screened for their antibacterial activity..

Keywords: Chalcones, cyanopridines ,pyrazolines, antibacterial activity

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Abstract:In the present study, the adsorption capacity of waste materials of copper pod fruit was determined for the removal of malachite green dye from aqueous solutions. This batch adsorption experiment was carried out to study for the various parameters such as adsorbent dosage, contact time, initial metal ion concentration, pH value and temperature. The morphology was investigated by scanning electron microscope and X-Ray diffraction data. The equilibrium data in aqueous solution were analysed using Freundlich, Langmuir isotherm model, Tempkin and Dubinin - Radushkevich isotherm. Adsorption isotherm of malachite green dye obeyed Langmuir isotherm model, Tempkin and..........

Keywords : Adsorption, Copper pod fruit, Isotherm, Kinetic and Malachite green

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Abstract: One key global challenge is the existing disparity in water distribution resulting to millions of people lacking access to safe clean water. It is currently assessed that 1.1 billion individuals on the planet lacks access to improved quality water supplies. This is aggravated by the looming climate change and increased pollution threats posed by industrialization and population growth. Use of adsorbents for water treatment is preferable due to simplicity of the technique and cheap materials involved. Geopolymers can be easily synthesized hydrothermally using alumina and silica and possess amorphous surface for use as adsorbents. Clay minerals have been reported to contain alumina..........

Keywords : Thermodynamics, Kinetics, Equilibrium, Geopolymers, Adsorption.

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Abstract: Efficient syntheses of 4-thiazolidinone are affected by reaction of 6-methoxy-2-acetyl naphthalene and 4-methoxy-2-hydroxy benzaldehyde to give chalcone. This on further reaction with guanidine nitrite gives Amino Pyrimidine derivative. This amino Pyrimidine derivative treated with methyl chloroformate, hydrazine hydrate and various substituted aromatic aldehydes respectively yielded various Schiff bases. The reaction of various substituted Schiff bases with thioglycolic acid gives corresponding 4-thiozolidinone derivatives The various synthesized compounds were assigned on the bases of elemental analysis, IR and 1H NMR spectral data. The compounds are evaluated for their antibacterial activity.

Keywords : Chalcones, Schiff base, 4-Thiozolidinone, Antibacterial Activity.

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Abstract: The kinetic measurements was carried out under pseudo first-order conditions are followed in different pH range kinetic integration and graphical method at different pH range 6.55, 7.0 and 9.2 at constant acetate buffer respectively. Its effect was observed in terms of different activities. These complexes were found stable at pH range the ligands forms coordinate bond with obeyed Beer's law..

Keywords : pseudo, acetate, activity, ligand, investigation..

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