Electrowinning of Nickel from ammonical sulphate bath and effect of acetone on morphology of nickel deposit and its correlation with kinetic parameters

The electrodeposition of nickel from nickel sulphate bath was studied in ammonia medium. The electrolytic conditions for nickel deposition was optimized at room temperature. The effect of acetone on current efficiency, morphology, stability and particle size of deposited nickel powder was studied. The effect of organic additive Tribenzyl ammonium chloride (TBAC) on the morphology of nickel powder was also studied. The kinetics of electrodeposition was studied and the results were utilized in developing mathematical model. During electrodeposition the current efficiency was found to increase with increase in acetone concentration up to 15% V/V in bath solution. On further increase of acetone concentration in bath solution current efficiency decreases. The stability of the electrowon deposited nickel powder was found to be in the range of 85 to 89 %. Powder morphology was found to be dentritic, porous and irregular. The morphology was also found to be underdeveloped dentritic to rounded aggregate as the concentration of organic additive TBAC increases. The average particle size of the deposited powder was found to be decreasing as the concentration of the acetone increases. The average size of the particle is in the range of 13-16 m

Energy efficient—Advanced oxidation process for treatment of cyanide containing automobile industry wastewater

Destruction of cyanide (CN) from an automobile industry wastewater by advance oxidation process (AOP) has been evaluated. The operating conditions (in an digenously designed photoreactor) for three different treatment strategies have been optimized. The treatment strategies involved use of, ultra violet light (UV), hydrogen peroxide (H2O2) and ozone (O3) in various combinations. Treatment of automobile industrywastewater (250 mg/L CN) showed fastest CN destruction, which was significantly (P < 0.05) faster than that observed with syntheticwastewater (with similar CN concentration). A combined application of H2O2/O3 was found to be the best option for maximum CN destruction. This treatment allows CN to reach the regional/international limit (of 0.02 mg/L) for safe industrial wastewater discharges to the receiving water bodies. The specific energy consumption by the photoreactor following this treatment was comparable to that obtained by conventional treatments, which use photocatalyst. Since the present treatment does not use catalyst, it provides an excellent energy efficient and economical option for treatment and safe disposal of CN containing industrial wastewater. © 200

Studies on substituted derivatives of polyaniline

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Electron localization in substituted derivatives of poly(aniline)

298-302Aromatic ring substituted and N-substituted derivatives of poly(aniline) have been synthesized. Their electronic spectra, magnetic properties, ESR and electrical conductivity data have been presented and (discussed in terms of electron localization due to substituent in the ring of poly(aniline)

Synthesis and biological activities of new 7-<i style="">o</i>-<img src='/image/spc_char/beta.gif' border=0>-D-glucopyranosyloxy-3-(3-oxo-3-arylprop-1-enyl)-chromones

1548-1557A convenient route to synthesize some new medicinally important 7-hydroxy-3-(3-oxo-3-arylprop-1-enyl)-chromones 2 is described by the interaction of 7-hydroxy-3-formyl chromone 1 with various substituted acetophenones which on condensation with 2,3,4,6-tetra-o-acetyl--D-glucopyranosyl bromide affords 2,3,4,6-tetra-o-acetyl--D-glucopyranosyloxy-3-(3-oxo-3-arylprop-1-enyl)-4H-chromen-4-ones 3. Later on deacetylation with anhydrous zinc acetate in methanol gives 7-o--D-glucopyranosyloxy-3-(3-oxo-3-arylprop-1-enyl)-4H-chromen-4-ones 4. These compounds are evaluated for their in vitro antimicrobial and antioxidant activity. The structures of these newly synthesized compounds are established by IR, NMR, mass spectra, elemental analysis and chemical analysis