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Synthesis and Characterization of Proccessible Polyaniline Derivatives for Corrosion Inhibition
No full textThis article reports the synthesis and characterization
of copolymers based on aniline and substituted
anilines by using dodecylbenzene sulfonic acid as a dopant.
The copolymers were soluble in organic solvents, such as
methanol, ethanol, isopropanol, N-methylpyrrolidinone,
dimethylsulphoxide, and have conductivity of the order of
1.5 to 10-7 S/cm depending upon the monomer ratios and
extent of dopant used. The effect of substituents like 2-
methyl, 2-ethyl, and 2-isopropyl groups on the electrochemical,
conductivity, thermal stability, solubilization, and spectroscopic
behavior of the copolymers has been evaluated.
The composition of the copolymers was determined by 1HNMR
spectroscopy. Corrosion inhibition behavior of the
copolymers in 1.0N HCl has been evaluated using linear
polarization resistance method and Tafel extrapolation
method. The corrosion efficiency depends upon the copolymer
composition and it increased with increasing amount
of 2-alkyl aniline in the feed
Prevention of anode fouling during the electrochemical perfluorination of aromatic carboxylic acid chlorides
No full textThe electrochemical perfluorination of benzoyl chloride, p-substituted benzoyl chlorides and cyclohexane
carboxylic acid chloride in anhydrous hydrogen fluoride (AHF) medium on nickel electrode is
reported. Experimental conditions suppressing polymeric film formation on the electrode are optimized.
Addition of 1 wt.% dimethyl sulfide based on the volume of AHF in the initial stage of electrochemical
fluorination and maintenance of the reactant and intermediate concentrations below a critical level
ensured electrochemical fluorination of all the reactants without fouling of the electrode surface.
Presence of p-substituents in the benzene ring improved the selectivity of alicyclic perfluoro carboxylic
acid. GC/MS and 19F NMR data for the major perfluorinated products are reported
Optimization of the process parameters for an electrochemical preparation of strontium perchlorate
No full textThe electrochemical preparation of strontium perchlorate, Sr(ClO4)2, from strontium chlorate employing
platinum anode and a rotating stainless steel cathode is described. The effect of electrolyte concentration, current density,
pH and temperature of the electrolyte and cathode rotation on current efficiency for the preparation of strontium
perchlorate was studied. A maximum current efficiency of 42% was achieved corresponding to an energy consumption
of 6.1 kWh. kg−1
1-Aminoanthraquinone derivatives as a novel corrosion inhibitor for carbon steel API 5L-X60 in white petrol–water mixtures
No full textThree amide derivatives of 1-aminoanthraquinones (AAQs) synthesized from long chain fatty acids were
evaluated for corrosion inhibition efficiency against steel (API 5L-X60) in white petrol–water mixtures
at room temperature by weight loss and electrochemical studies. Potentiodynamic polarization studies
carried out at room temperature on steel (API 5L-X60) in white petrol with water containing 120ppm of
chloride and 50ppm of the 1-aminoanthraquinone derivatives showed that all the investigated compounds
are of anodic type and good corrosion inhibitors in white petrol–water mixtures. Oleic acid
derivative of 1-aminoanthraquinone was found to be the best corrosion inhibitor. It exhibited 86% inhibition
efficiency against the corrosion of API 5L-X60 steel. The surface analysis by AFM indicated the
adsorption of inhibitors on the metal surface. Besides, all the synthesized 1-aminoanthraquinone derivatives
exhibited antimicrobial efficacy against Serratia marcescens ACE2 and Bacillus cereus ACE4
Molecular characterization and corrosion behavior of thermophilic (55 8C) SRB Desulfotomaculum kuznetsovii isolated from cooling tower in petroleum refinery
No full textDesulfotomaculum kuznetsovii (D. kuznetsovii), a thermophilic sulfate-reducing
bacterium (SRB), was identified in a cooling tower of a petroleum refinery by 16S
rRNA gene sequencing and its functional gene encoding dissimilatory sulfite
reductase (dsrAB). The thermophilic sulfate-reducing bacterial species have
been reported for the first time in the cooling towers of an Indian petroleum
refinery. The protein coded by dsrAB gene was cloned, expressed, and identified
using recombinant DNA technology. Weight loss method, electrochemical and
surface analysis showed the corrosion behavior of the isolate. In the presence of
D. kuznetsovii, the corrosion rate was higher when compared to control at 55 8C.
It suppresses the anodic reaction and enhances the cathodic reaction by the
production of organic complex and iron sulfide, respectively. Numerous pitting
were noticed on mild steel which is due to the presence of D. kuznetsovii and its
role in the corrosion process has been discussed
Thermal Behavior of LixCoO2 Cathode and Disruption of Solid Electrolyte Interphase Film
No full textThermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and ion chromatography(IC) were
employed to analyze the thermal behavior of LixCoO2 cathode material of lithium ion battery. The mass loss peaks
appearing between 60 and 125 oC in TGA and the exothermic peaks with 4.9 and 7.0 J/g in DSC around 75 and 85
oC for the LixCoO2 cathodes of 4.20 and 4.35 V cells are explained based on disruption of solid electrolyte interphase
(SEI) film. Low temperature induced HF formation through weak interaction between organic electrolyte and LiF
is supposed to cause carbonate film disruption reaction, Li2CO3 + 2HF → 2LiF + CO2 + H2O. The different spectral
DSC/TGA pattern for the cathode of 4.5 V cell has also been explained. Presence of ionic carbonate in the cathode
has been identified by ion chromatography and LiF reported by early researchers has been used for explaining the
film SEI disruption process. The absence of mass loss peak for the cathode washed with dimethyl carbonate (DMC)
implies ionic nature of the film. The thermal behavior above 150 oC has also been analyzed and presented
Enhancing the performance of dye-sensitized solar cells based on an organic dye by incorporating TiO2 nanotube in a TiO2 nanoparticle film
No full textThe photoelectrochemical properties of a high molar extinction coefficient charge transfer organic dye
containing thienylfluorene segment called FL, and the effect of incorporating TiO2 nanotube (TiNT) in TiO2
nanoparticle film along with the above dye on the photovoltaic performance of dye-sensitized solar cells
(DSSCs) were investigated. The influence of soaking time of the TiO2 electrode in dye solution and the
effect of varying its concentration, on the solar cell efficiency was also studied. Cyclic voltammetric (CV)
analysis revealed the linear relationship between the anodic peak current and the scan rate, indicating a
surface-confined diffusion process.
The surface morphology of TiNT was characterized using SEM, TEM and XRD. The open-circuit voltage
(VOC) of the DSSC increased with the increase in the wt% of TiNT and shows optimal value at about 5 wt%,
which is correlated with the suppression of the electron recombination as found out from the electron
lifetime studies.
The electrochemical impedance spectroscopy (EIS) technique was employed to quantify the charge
transport resistance (Rct) and electron lifetime under different ratios of the TiNT/nanoparticle. The electron
lifetimes of the DSSCs based on FL and N3 dyewere very close to one another and the DSSC based on
the FL showed respectable photovoltaic performance of ca. 7.8% under the light intensity of 100mWcm−2
(AM 1.5G)
Removal of H2S using a new Ce(IV) redox mediator by amediated electrochemical oxidation process
No full textBACKGROUND: Hydrogen sulfide (H2S) from industrial activities and anaerobic manure decomposition in commercial livestock
animal operations is an offensivemalodorous and toxic gas even in small concentrations, causing serious discomfort and health
and social problems. The objective of this study was to employ for the first time a novel, attractive, low cost, environmentally
benign mediated electrochemical oxidation (MEO) process with Ce(IV) as the redox catalyst forH2S gas removal from anH2S–air
feed mixture.
RESULTS: The influence of liquid flow rate (QL) from2–4 Lmin−1, gas flow rate (QG) from 30–70 L min−1, H2S concentration in
theH2S–air feed mixture from 5–15 ppm, and Ce(III) pre-mediator concentration in the electrochemical cell from 0.1–1 mol L−1
on H2S removal efficiency were investigated. Both liquid and gas flow rates influenced the removal efficiencies, but in opposite
directions.Nearly 98%H2S removal was achievedwhen the concentration of Ce(IV)mediator ion in the flowing scrubbing liquid
reached 0.08mol L−1.
CONCLUSIONS: The new MEOmethod proved promising for H2S removal, achieving high removal efficiency. Integration of the
electrochemical cell with the scrubber set-up ensured continuous regeneration of the mediator and its repeated reuse for H2S
removal, avoiding use of additional chemicals. Since the processworks at room temperature and atmospheric pressure utilizing
conventional transition metal oxide electrodes more commonly used in industrial applications, it is also safe and economical
An Aqueous Cleaning Solution for Removing Oil and Grease from Steel Components
Get PDFAn Aqueous Cleaning Solution for Removing Oil and Grease from Steel Component
Photoelectrochemical properties of CdSxTe1-x films
No full textCdSxTe1-x films were deposited on titanium and conducting glass substrates at room temperature using 0.25 M cadmium sulphate, the concentration of sodium thiosulphate and TeO2 dissolved in sodium hydroxide was varied in the range of 0.01–0.05 M. The as deposited films exhibited hexagonal structure irrespective of the composition. The FWHM maximum of the x-ray diffraction peaks were found to decrease with increase of duty cycle. The optical energy gap values are in the range of 1.54–2.32 eV for films of different composition, it is observed that the band gap shifts towards CdS side as the concentration of CdS in the films increase. Photoelectrochemical cell studies indicated higher short circuit current density and efficiency compared to earlier reports