Browsing by Author "Noyel Victoria, S."

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    Psidium guajava leaf extract as green corrosion inhibitor for mild steel in phosphoric acid
    (Electrochemical Science Group mantonijevic@tf.bor.ac.yu, 2015) Noyel Victoria, S.; Prasad, R.; Ramachandran, R.
    The adsorption and corrosion inhibition property of the alcoholic Psidium guajava (guava) leaf extract on mild steel in 1M phosphoric acid medium was investigated by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The studies showed that the inhibition efficiency increases with inhibitor concentration upto 800 ppm and decreases slightly at 1200 ppm. The adsorption obeys both the Langmuir and the Temkin adsorption isotherm equations. The kinetic and thermodynamic parameters were calculated and discussed. The adsorption was found to follow a comprehensive type adsorption dominated by chemisorption. Potentiodynamic polarization studies showed that the inhibitor acted as a mixed-type inhibitor. © 2015 The Authors.
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    Simple one-pot sonochemical synthesis of copper sulphide nanoparticles for solar cell applications
    (Elsevier B.V., 2019) Singh, A.; Ramachandran, R.; Noyel Victoria, S.
    Copper sulphide nanoparticles for solar cell applications were synthesized by a single step sonochemical method using copper acetate and thiourea as precursors. The effects of sonication time, ultrasonic bath temperature and annealing temperature on particle properties were studied. Synthesized particles were characterized using scanning electron microscope, transmission electron microscope, X-ray diffraction spectrophotometer and UV–visible spectrophotometer. The particles were found to be a mixture of chalcocite, covellite and djurleite. The optical band gap of the particles was found to be in the range of 1.6–2.1 eV. Heat treatment of the particles was found to give rise to needle shaped particles while a bath temperature of 55 °C yielded few nanoplates. © 2015 The Authors
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    Visible range photocatalysts for solid phase photocatalytic degradation of polyethylene and polyvinyl chloride
    (Sociedad Chilena de Quimica, 2017) Gupta, A.; Lakshmi, Y.N.; Ramachandran, R.; Noyel Victoria, S.
    Solid phase photocatalytic degradation of polyethylene (PE) and polyvinyl chloride (PVC) with various photocatalysts such as ceria annealed at 350°C and 850°C, zinc oxide annealed at 250°C, copper sulfide and titania particles was studied under different light sources. Except titania, all the other photocatalysts performed reasonably well both in the visible and ultra-violet (UV) radiations. Ceria annealed at 850°C showed degradation efficiencies higher than 70% for PVC in the fluorescent and solar radiation. Ceria annealed at 350°C showed degradation efficiencies higher than 75% for polyethylene in fluorescent, solar and UV radiation. The Fourier transform infrared spectroscopy studies show the presence of adsorbed carbon dioxide on the degraded polymer-photocatalyst composite films. The UV-visible spectroscopic studies show that the ceria, zinc oxide and copper sulfide photocatalysts are active in the visible spectrum resulting in enhanced degradation efficiency in fluorescent and solar radiation.