Green corrosion inhibition and adsorption characteristics of Luffa cylindrica leaf extract on mild steel in hydrochloric acid environment

Ogunleye, O. O.; Arinkoola, A. O.; Eletta, Omodele A. A.; Agbede, Oluseye Omotoso; Osho, Y A; Morakinyo, A. F.; Hamed, Jimoh Olugbenga

doi:10.1016/j.heliyon.2020.e03205

Cited by 148 publications

(54 citation statements)

References 28 publications

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“…The relationship between the surface coverage and the inhibitor concentration forms a basis to the study of the mechanism of adsorption isotherm (74) . All these isotherms are represented as follows (75) f (θ , x)exp(−2aθ ) = KC Where, f(θ , x) is the configurational factor, θ is the surface coverage, C is the concentration of the inhibitor, X is the molecular interaction parameter, and K is the equilibrium constant for the adsorption process.…”

Section: Adsorption Isotherms Behaviourmentioning

confidence: 99%

Corrosion inhibition behaviour on carbon steel in well-water by Ethanolic extract of Portulaca quadrifida (Chicken weed) leaves

Thirupathi¹,

Venkatraman²

2021

IJST

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Objectives: To evaluate the corrosion inhibition of an ethanolic extract of Portulaca quadrifida (PQ) leaves on the carbon steel surface in well-water by using a weight-loss study with various immersion periods, temperatures, and pH. The kinetic and thermodynamic parameters are calculated for various temperatures. Methods: The protective film has been analyzed by using SEM, EDX and AFM studies. The inhibition action of PQ extract was analyzed by potentiodynamic polarization study, the electrochemical impedance studies are used to the analysis the protective layer formed on the carbon steel surface. Findings: The maximum inhibition efficiency is found to be 92% for 500ppm of PQ and 30ppm of Zn 2+ ions at 303K. The synergistic effect exists between ethanolic extract of Portulaca quadrifida leaves and Zn 2+ ions by synergistic parameters. The ethanolic extract of PQ leaves acts as a mixed-type inhibitor. The activation energy (E a ) values indicate that the adsorption of PQ leaves extract on the carbon steel surface. The enthalpy of adsorption (∆H) values suggests that the reaction is endothermic. The free energy of adsorption (∆G ads ) values is negative and less than the -20KJmol -1 . The negative values of ∆S ads are confirmed to form an ordered stable layer of the inhibitor molecule on the carbon steel surface as well as a stable equilibrium between the adsorption and desorption processes. The adsorption isotherm is best fitted with the Langmuir model. Novelty: The ∆G ads values indicate that the adsorption of inhibitor on the carbon steel surface belongs to the physisorption as well as the adsorption layer has an electrostatic character. The adsorption process of the inhibitor is spontaneous. The thermodynamic parameters give a strong interaction between the inhibitor molecules and carbon steel surface. Four adsorption isotherms including Langmuir, El-Awady, Flory-Huggins, and Temkin models, investigate the mode of inhibition of PQ leaves extract.

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Section: Adsorption Isotherms Behaviourmentioning

confidence: 99%

Corrosion inhibition behaviour on carbon steel in well-water by Ethanolic extract of Portulaca quadrifida (Chicken weed) leaves

Thirupathi¹,

Venkatraman²

2021

IJST

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“…The detail of the parameters estimated for various isotherms is tabulated in Table 10 . Langmuir isotherm assumes monolayer adsorption, the maximum of which occurs when the surface is covered by a monolayer of adsorbate ( Ogunleye et al., 2020 ). The optimum capacity of adsorbent can, therefore, be determined using the Langmuir model.…”

Section: Adsorption Isothermmentioning

confidence: 99%

Improved phenol sequestration from aqueous solution using silver nanoparticle modified Palm Kernel Shell Activated Carbon

Aremu

Arinkoola

Olowonyo

et al. 2020

Heliyon

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Modified Palm Kernel Shell Activated Carbon (PKSAC) using silver nanoparticle (Ag-NPs-PKSAC) was investigated on phenol uptake from aqueous solution. Effects of temperature (500–700 °C), time (90–120 min), and alkaline concentration (0.1–0.5 M) were studied on the yield and methylene blue numbers for the synthesis. Effects of initial concentration (100–200 mg/L), agitation (150–250 rpm), contact time (30–120 min), and adsorbent dosage (0.15–0.25 g) were studied in a batch experiment on percentage removal of phenol. The PKS, char, PKSAC and Ag-NPs-PKSAC were characterized using BET, FTIR, SEM, and proximate analyses. The synthesis of PKSAC was optimum at 608 °C, 0.5 M KOH, and carbonization holding time of 60 min. The optimum phenol uptake was 85.64, 90.29 and 91.70% for PKSAC, Ag-NPs-PKSAC, and commercial adsorbent, respectively. The adsorption mechanism of phenol followed the Langmuir isotherm and best described as physio-sorption with pseudo-second-order kinetics. Phenol exhibits high affinity (ΔS° = 0.0079 kJ/mol K) for Ag-NPs-PKSAC with favorable adsorption (ΔG° = -1.551 kJ/mol) at high temperature due to endothermic (ΔH° = 1.072 kJ/mol) nature of the system. The result obtained in this study compared favorably with the literature.

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“…The weight change of the metallic material affected by the electrochemical process with the application of the treated Rhizopora mucronata tannin and Luffa cylindrica leaf extract as the corrosion inhibitors to protect the low-carbon steel increases with increasing of the NaCl concentration in the solution [37,38]. Empirical evidence (Table 3) shows that the value of a increased from 0.0008 to 0.0011 mg/h with increasing of the NaCl concentration in solution from 0 to 5% (w/w) could be due to the passive layer on low-carbon steel is susceptible to chloride attacks [2].…”

Section: Weight Changementioning

confidence: 99%

The empirical prediction of weight change and corrosion rate of low-carbon steel

Ali

Fulazzaky

2020

Heliyon

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Understanding the corrosion rate of metallic building materials is very important to maximize their beneficial use of public facilities. Direct measurements of the weight change and corrosion rate would be time consuming and expensive. This study aims to develop new empirical models based on the experimental data of testing 25 specimens immersed in five different environments for predicting the weight change and corrosion rate of the low-carbon steel. Using the equation developed based on the correlation between corrosion rate and chloride ion concentration is able to predict the corrosion rate of low-carbon steel at the limited chloride ion concentration. An increase in the trend lines of plotting the modeled and measured weight change of low-carbon steel versus immersion time is very similar to each other and progressively increase with increasing of the NaCl concentration. The corrosion rate of low-carbon steel increases from 0.202 to 0.286 mm/y with increasing of the NaCl concentration from 0 to 5% (w/w) in aqueous solution. The weight change and corrosion rate of the steel material are predicted using the new empirical models to contribute to the most reliable applications of low-carbon steel building materials in the future.

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Green corrosion inhibition and adsorption characteristics of Luffa cylindrica leaf extract on mild steel in hydrochloric acid environment

Cited by 148 publications

References 28 publications

Corrosion inhibition behaviour on carbon steel in well-water by Ethanolic extract of Portulaca quadrifida (Chicken weed) leaves

Corrosion inhibition behaviour on carbon steel in well-water by Ethanolic extract of Portulaca quadrifida (Chicken weed) leaves

Improved phenol sequestration from aqueous solution using silver nanoparticle modified Palm Kernel Shell Activated Carbon

The empirical prediction of weight change and corrosion rate of low-carbon steel

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