Inhibitive Effect of Glutaraldehyde on the Corrosion of Aluminum in Hydrochloric Acid Solution

The inhibition effect of glutaraldehyde on the corrosion of aluminum in 1.4 M HCl solution at 308-318 K was investigated by using weight loss method and characterized by Fourier Transform Infrared Spectroscopy (FTIR) & Scanning Electron Microscopic Analysis (SEM). The results show that the inhibition efficiency increases with increasing inhibitor concentration and decreases with rising temperature. The activation energy value was 20.48 kJ mol-1 for the uninhibited acid solution which increased to 33.79 kJ mol-1 in the presence of 0.1 M inhibitor concentration. Langmuir adsorption isotherm was found to provide an accurate description of the adsorption behavior of the investigated inhibitor. The thermodynamic parameters such as adsorption equilibrium constant (Kads), free energy of adsorption (ΔGads), heat of adsorption (ΔHads) and entropy of adsorption (ΔSads) have been calculated and discussed in detail

Inhibitive Effect of Glutaraldehyde on the Corrosion of Aluminum in Hydrochloric Acid Solution

The inhibition effect of glutaraldehyde on the corrosion of aluminum in 1.4 M HCl solution at 308-318 K was investigated by using weight loss method and characterized by Fourier Transform Infrared Spectroscopy (FTIR) & Scanning Electron Microscopic Analysis (SEM). The results show that the inhibition efficiency increases with increasing inhibitor concentration and decreases with rising temperature. The activation energy value was 20.48 kJ mol-1 for the uninhibited acid solution which increased to 33.79 kJ mol-1 in the presence of 0.1 M inhibitor concentration. Langmuir adsorption isotherm was found to provide an accurate description of the adsorption behavior of the investigated inhibitor. The thermodynamic parameters such as adsorption equilibrium constant (Kads), free energy of adsorption (ΔGads), heat of adsorption (ΔHads) and entropy of adsorption (ΔSads) have been calculated and discussed in detail

GEO-Accumulation Index for Heavy Metals in Groundwater: a Study of Bompai and Sharada Industrial Estates, Kano Metropolis, Nigeria

Abstract: The level of concentration of heavy metal in soil is detrimental to groundwater quality in Sharada and Bompai industrial areas. A total of 40 sampling points were selected from both two areas. The digested samples were analysed for As, Cd, Cr, Cu, Co, Ni and Pb using Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-OES) machine. Geographic Information Systems (GIS) was used to model and present the spatiotemporal changes of the pollution sources and factors affecting the levels of pollution. Pollution in water and potential risks introduced by heavy metal accumulation were assessed using Geo-accumulation index. Results indicated that Cadmium and Arsenic are the most vulnerable around Bompai with mean of 0.2-0.4/mg/l and 1.3-1.6 mg/l respectively, Geo-accumulation index mapping showed that Arsenic, Cadmium and Copper to have high accumulation index ranging from strong to very strong (0.99-1.48), (0.01-0.22) and (0.27-0.33) respectively, Cobalt to have moderate contamination in Sharada (wet season) with (-0.39-0.12) while lead and Chromium has the least contamination index (uncontaminated). GIS modelling and mapping indicated that all the heavy metals were found in the groundwater of the two areas but among them Cd is more concentrated. South-western part of the study area confronts the most serious heavy metal pollution, hence the need for groundwater treatment before drinking to avoid dangers associated with heavy metals

Predictive model of 2-cyclohexylthiophene for corrosion inhibition in mild steel using computational method

Corrosion inhibition activity of 2-cyclohexylthiophene (2CHT) for mild steel in acidic media was predicted using QSAR tool. The model used two descriptors namely; Moran autocorrelation of lag4 weighted by mass (MATS4M) which explained the linearity and branching of the compounds and largest eigen values n3 of burden matrix weighted by mass (SPMAX3-Bh(m)) describes the nature and size of the neighboring atom. The modeling results revealed the potential of the compounds as a good corrosion inhibitor with percentage inhibition efficiency (%IE) of 76.5%. Quantum chemical calculation using DFT with 6-311G++(d,p) basis was used to evaluate the performance of the predicted compound as corrosion inhibitor by quantum chemical parameters such as EHUMO, ELUMO, Energy gap (Egap), hardness (?), softness (S), dipole moment (µ), electronegativity (X), electron affinity (A), ionization energy (I) and total energy (TE). The results obtained from quantum chemical parameters were found to be consistent with predicted result

Theoretical and experimental studies of corrosion inhibition of thiohene-2-ethylamine on mild steel in acid media

Corrosion inhibition of mild steel in 0.5M H2SO4 at 30°C with thiophene-2- ethylamine (TEA) as inhibitor has been assess by quantitative structure activity relation (QSAR) model and quantum chemical calculations. The results were evaluated using weight loss and electrochemical methods such as potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The results showed good performance of TEA in corrosion protection which behaves as mixed inhibitor from PDP. The micrograph from FESEM and EDX dot mapping showed that the inhibitor adsorbed onto the metal surface with different distribution for S, C and N atoms which indicate less damage on the metal surface in the presence of TEA

Modeling and Equilibrium Studies for the Adsorption of Congo red Using Detarium microcarpum Seed Shell Activated Carbon

Activated carbon obtained from Detarium microcarpum seed shell (SDAC) was used to eliminate congo red (CR) from an aqueous solution using batch adsorption method. Various characterization techniques, including SEM, FT-IR and pH at point of zero charge (pHpzc) were employed to characterize the adsorbent surface. The study investigated several adsorption parameters, namely contact time (5 - 150 minutes), temperature (303 - 323 K), and initial concentration (20 - 500 mg/L). The adsorption data were analyzed using kinetic, isotherm, and thermodynamic equations. The kinetics of the process conformed well to the pseudo-second-order model, indicating that both external and internal diffusion influenced the adsorption of the dye onto the adsorbent. The isotherm data aligned with the Freundlich model, suggesting that CR formed multiple layers on the heterogeneous surface of the adsorbent. The values of thermodynamic calculations ∆S = -0.139 kJ/mol, ∆H = - 48.77 kJ/K demonstrates the feasibility and exothermic nature of the dye adsorption process and the values of ∆G = -6.52, -5.82, -5.12, -4.42 and -3.73 kJ/mol  obtained at various temperature confirmed the spontaneity of the entire adsorption process

Combined Computational and Experimental Studies for the Removal of Anionic Dyes using Activated carbon drive from Agricultural Waste

In recent years, there has been a growing interest among researchers in combining experimental and theoretical approaches to elucidate interactions between adsorbates and adsorbents. This study focuses on investigating the adsorption behavior of two anionic dyes, methyl orange (MO) and congo red (CR), on a sustainable adsorbent derived from sweet detar seed shell activated carbon. Additionally,to provide an explanation for the adsorption mechanisms using Density Functional Theory (DFT) calculations. The environmentally-friendly sweet detar seed shell activated carbon is synthesized and thoroughly characterized through various analytical techniques such as FTIR, SEM and pHpzc The experimental results for adsorption equilibrium demonstrate that the adsorption of both dyes conforms well to the Freundlich adsorption model. The maximum adsorption capacities are determined to be revealing a maximum adsorption capacity of 49.02 mg g−1 for MO and 38.91 mg g−1 for CR at. Furthermore, the kinetic data fits effectively with the pseudo-second-order kinetic model for both dyes, showing a coefficient of determination (R²) close to unity and experimental qe values for MO and CR, 9.52 and 9.43 mg/g are close to calculated values 9.62 and 9.43 mg/g. Additionally, quantum chemical parameters indicate a stronger interaction between the MO molecule and adsorbent surface framework compared to CR. These computaional results are consistent with the experimental findings, underscoring the accuracy and applicability of the calculations