CJ-VOLUME 02 ISSUE 04 JULY 2012


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Volume 2 Issue 4, July 2012

Chemistry Journal

ISSN

2049-954X

Publication Frequency

6 Issues per year

Pages

136-157

Publication History


Original Articles

Surfactants Based on Palmitic Acid and Nitrogenous Bases for Removing Thin Oil Slicks from Water Surface

Ziyafaddin H. Asadov, Ahmed H. Tantawy, Ilhama A. Zarbaliyeva, Ravan A. Rahimov and Gulnara A. Ahmadova

Pages 136-145

Complex Formation in a Liquid-Liquid Extraction System Containing Indium(III), 4-(2-Pyridylazo) Resorcinol and Neotetrazolium Chloride

Teodora S. Stefanova, Galya K. Toncheva and Kiril B. Gavazov

Pages 146-152

Eco-Friendly Impact of Vernonia amygdalina as Corrosion Inhibitor on Aluminium in Acidic Media

Ajanaku Kolawole Oluseyi, Ajanaku Christiana Oluwatoyin, Akinsiku Anuoluwa Abimbola, Falomo Ayorinde, Edobor-Osoh Abiola and John Oluwatosin Moriamo

Pages 153-157


Title

Surfactants Based on Palmitic Acid and Nitrogenous Bases for Removing Thin Oil Slicks from Water Surface

Abstract

Complexes based on palmitic acid and nitrogen-containing compounds were synthesised. Surface-active properties (interfacial tension) of the obtained comple-xes were investigated by stalagmometric method. Petroleum-collecting and disper-sing properties of the synthesized complexes in diluted and undiluted form (5% wt. water or alcoholic solution) in waters of varying salinity (distilled, fresh and sea waters) have been studied. Some of physico-chemical indices of the prepared compounds as solubility, acid and amine numbers as well as electrical conductivity have been determined. Surface properties studied included Critical Micelle Concen-tration (CMC), maximum surface excess (ᴦmax), and minimum surface area (Amin). Free energy of micellization (∆Gomic) and adsorption (∆Goads) were calculated. The results showed that some of the synthesized complexes could be used as petro-collecting and dispersing agents for removing petroleum films from water surface.

Keywords

Palmitic Acid, Nitrogen-Containing Compounds, Complex Dispersing Agent

 

Title

Complex Formation in a Liquid-Liquid Extraction System Containing Indium(III), 4-(2-Pyridylazo) Resorcinol and Neotetrazolium Chloride

Abstract

Complex formation and liquid-liquid extraction were studied in a system containing indium(III), 4-(2-pyridylazo) resorcinol (PAR), 3,3'-(4,4'-biphenylene) bis(2,5-diphe-nyl-2H-tetrazolium chloride) (Neotetrazolium chloride, NTC), water and chloroform. The optimum conditions for indium(III) extraction as an 1:2 ion-associate of the In(III)-PAR anionic chelate, [In3+(OH)3(PAR2-)2]4-, and neotetrazolium cation (NT2+) and were found: pH (8.0-8.5), shaking time (2 min), concentration of the reagents (CPAR=CNTC=4×10-4 mol L-1) and the sequence of their addition. The following key constants were calculated: constant of extraction (Log Kex=9.60± 0.06), constant of association (Log b=8.82±0.05) and constant of distribution (Log KD=0.78±0.01). Some additional characteristics concerning the application of PAR and NTC for extractive-spectrophotometric determination of In(III) were estimated as well: absorption maximum (l=515 nm), apparent molar absorptivity (e’=7.0×104 L mol-1 cm-1), recovery factor (R%=85.0±0.1), limit of detection (LOD=0.10 mg cm-3), limit of quantification (LOD=0.34 mg cm-3) and Sandell’s sensitivity (SS=1.64 ng cm-2). Beer’s law is obeyed for In(III) concentrations up to 2.9 μg mL-1 with a correlation coefficient of 0.9994.

Keywords

Indium, Ternary Complex, Solvent Extraction, Spectrophotomety, Azo Compound, Ditetraz-olium Salt

  

Title

Eco-Friendly Impact of Vernonia amygdalina as Corrosion Inhibitor on Alumini-um in Acidic Media

Abstract

Corrosion inhibition effect of Vernonia amygdalina extract on aluminium in 0.5 M HCl solution was studied using gravimetric method at 40 oC temperature. Alumini-um coupons of dimension 3x1.5 cm were immersed in test solutions of uninhibited acid and those containing extract concentrations of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 g/L concentration at intervals of 30 minutes progressively for 150 minutes. The results revealed that V. amygdalina could be used as an eco-friendly corrosion inhibitor for aluminium in HCl solution. The corrosion inhibition efficiency of the extract increases with concentrations in the corrosion media. The surface coverage of the extract obeyed Langmuir adsorption isotherm. Hence, the corrosion inhibiti-on effect of the extract was rationalized via adsorption mechanism.      

Keywords

Hydrochloric Acid, Aluminium, Adsorption, Vernonia amygdalina, Inhibition Efficiency