The inhibition efficiency of corrosion on mild steel using acids by three different novel Semicarbazones as inhibitors have been studied using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy methods. The inhibition efficiency, corrosion rate, the nature of anchoring sites and the adsorption characteristics have been determined from the results. It was found that the newly synthesized compounds behaved as mixed type inhibitors with high inhibition efficiency. The inhibition efficiency increases with increasing the inhibitors concentration but decreases with increasing the temperature. Addition of halide ion enhances the inhibition efficiency. The adsorption of the inhibitors on the mild steel surface obey Langmuir adsorption isotherm.Scanning Electron Spectroscopy is used to examine the surface morphology of mild steel samples both in the presence and absence of inhibitors at optimum conditions. Scanning Electron Microscope reveals the formation of a smooth, dense protective layer in the presence of inhibitor.
The present work deals with collection, handling, utilization, and management of the waste flowers that are coming out of the temples in Coimbatore District, Tamilnadu, India. An attempt has been made to provide a current situation and complete analysis of temple waste flowers (TWFs) with suggestions and recommendations. As a part of Clean India, Clean and Green Kovai (Green Coimbatore) mission, this paper gives an idea to reduce the volume of temple waste flowers by converting into activated carbon by direct pyrolysis process and chemical activation with sulfuric acid and phosphoric acid process, respectively. The products were analyzed and compared based on the results of physicochemical parameters including pH, conductivity, moisture content, ash content, volatile content, fixed carbon, bulk density, porosity, specific gravity, water soluble matter, acid soluble matter, iodine number, methylene blue number, yield, and Brunauer-Emmett-Teller (S) surface area. The structure, surface morphology, and chemical compositions of carbon were determined by field emission scanning electron microscopy (FeSEM), and energy-dispersive X-ray spectroscopy (EDS), respectively. From the comparison of results, the activated carbon produced from temple waste flowers by direct pyrolysis process is fairly better due to low moisture content, low ash content, better yield, and higher surface area.
A detailed comparative study on inhibitive behaviour against corrosion of mild steel in 1N H2SO4 IN HCl for the Schiff bases 2,6-diphenyl-3-methyl azinan-4-one (D3MA) (S1), 2,6-diphenyl-3-methyl azinan-4-one semicarbazone (D3MAS) (S2), 2,6-diphenyl azinan-4-one (DA) (S3) and 2,6-diphenylazinan-4-one semicarbazone (DAS) (S4) was investigated using gravimetric and potentiodynamic polarisation methods. The thermodynamic parameters for the mild steel corrosion and the synergistic behaviour of the inhibitors in the presence of anions and cations were determined and discussed. It was found that the adsorption of the inhibitors on the mild steel surface obeyed Langmuir adsorption isotherm. Electro chemical studies revealed that all the four inhibitors are of mixed type. We proved that the semicarbazones (Schiff bases S2b and S4) with additional O and N are more effective corrosion inhibitors than their parent keto-amines. As a whole from all the proposed studies it is proved that the explored Schiff’s bases work as a very efficient corrosion inhibitor for mild steel in both the acidic medium.
In recent decades, the analysis of nanoparticles is of greater importance for their applications in various fields. This present work also focuses the novel biological green material to synthesize the copper and cobalt oxide nanoparticles. The copper oxide (CuO) and cobalt oxide (Co3O4) nanoparticles (nps)have been synthesized by biological strategy utilizing AH (Araucaria heterophylla) gum extract. The characterization techniques, i.e. UV, GC-MS, FT-IR, XRD, SEM, HR-TEM provide concrete information about the morphology, crystalline nature and structure of the synthesized nanoparticles. The high resolution TEM and SAED images confirm the formation of spherical shaped (Co3O4) and oval shaped (CuO) isolated nanoparticles. The catalytic adequacy of the developed catalyst, copper oxide (CuO) and cobalt oxide (Co3O4) nanoparticles was analyzed for the degradation of dyes: Methylene Blue (MB), Congo Red (CR), Acid Violet (AV).The kinetic investigations for the reduction of synthetic dyes by the nanoparticles were assessed and the reduction contemplates are very much fitted with the pseudo second order kinetic model with less time.The antibacterial and antifungal activity of the prepared nanoparticles have been evaluated against Escherichiacoli, Staphylococcus aureus, Bacillus subtilis, Aspergillusniger and Candida albicans.
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