Yazar "Bahadur, Indra" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Corrosion inhibition, surface adsorption and computational studies of Swertia chirata extract: A sustainable and green approach
    (Elsevier Science Sa, 2021) Haldhar, Rajesh; Prasad, Dwarika; Nguyen, Le T. D.; Kaya, Savas; Bahadur, Indra; Dagdag, Omar; Kim, Seong-Cheol
    The aerial parts extracted from Swertia chirata (S. chirata) plant were employed for the corrosion resistance of carbon steel in the acidic medium (0.5 M H2SO4) utilizing by weight-loss method, Tafel and EIS. The state of mixed inhibitor adsorption on the carbon steel surface were shown by potentiodynamic polarization. S. chirata achieved the extraordinary inhibition efficiency of 92.32% at 500 mg/L of inhibitor concentration. SEM and AFM were used to know about the thin layer formed on the surface of carbon steel for its protection from corrosion and the adsorption of inhibitors shown by UV-vis analysis FT-IR technique confirmed the existence of functional groups and the heteroatoms exhibited in the inhibitor. Adsorbance by the inhibitory molecules on the carbon steel surface followed the Langmuir adsorption isotherm. Theoretical investigations (computational) showed a precious report which was supported by experimental results. All acquired outcomes ensure that S. chirata extract can procedure an effectual preventing layer and restrict the corrosion procedure.
  • Küçük Resim Yok
    Öğe
    Investigation of plant waste as a renewable biomass source to develop efficient, economical and eco-friendly corrosion inhibitor
    (Elsevier, 2021) Haldhar, Rajesh; Prasad, Dwarika; Bahadur, Indra; Dagdag, Omar; Kaya, Savas; Verma, Dakeshwar Kumar; Kim, Seong-Cheol
    Various concentration of Solanum surattense (S. surattense) aerial parts extract was utilized for low carbon steel (LCS) in the presence of corrosive medium (0.5 M sulfuric acid) utilizing weight-loss technique and electrochemical methods (Tafel and EIS). The mixed adsorption status on the LCS was exhibited by potentiodynamic polarization. S. surattense accomplished 93% corrosion inhibition effectiveness at an inhibitor concentration of 500 mg/L. SEM and AFM was utilized to distinguish the thin film framed on the outside of the metal alloy to protect it from corrosion. The molecular adhesion of the inhibitor was demonstrated to be Ultraviolet-visible (UV-Vis) spectroscopic method. The FT-IR strategy supported the existence of different functional groups and different atoms other than Carbon and Nitrogen in the protective extract. Thin layer adhesion of the inhibitor molecules outside of LCS metal substrate obeyed the Langmuir adsorption isotherm and acted as mixed type inhibitor. DFT revealed an entirely important report with high EHOMO and low ELUMO values for active phytoconstituents showing potential nature of inhibitor and good agreements with experimental outcomes. The whole acquired results entail that S. surattense creates protective coat hence limit the degree of LCS degradation. (C) 2021 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Papaver somniferum as an efficient corrosion inhibitor for iron alloy in acidic condition: DFT, MC simulation, LCMS and electrochemical studies
    (Elsevier, 2021) Haldhar, Rajesh; Kim, Seong-Cheol; Prasad, Dwarika; Bedair, M. A.; Bahadur, Indra; Kaya, Savas; Dagdag, Omar
    The corrosion resistance of iron alloy in 0.5 M sulphuric acid was checked in the presence and absence of Papaver somniferum ( P. somniferum ) seed extract. Notably, P. somniferum showed 95% corrosion resistance efficiency at 500 mg/L concentration. The adsorption of this inhibitor follows the Langmuir isotherm indicating its monolayer formation on the surface of iron alloy. The potentiodynamic experiments indicated its nature as mixed type of inhibition behaviour. The SEM and AFM techniques were used to study the protective layer on iron alloy. FT-IR with ATR confirmed various functional groups containing heteroatoms present in phytochemicals and formed complex with iron respectively. Theoretical studies were given as a valuable report to understand the comparative adsorption of phytochemical. All acquired outcomes confirmed that P. somniferum seed extract act as an efficient corrosion inhibitor. (c) 2021 Elsevier B.V. All rights reserved.