Salisu Hassan Nahuche

https://doi.org/10.64823/ijpcs.2601005

Adsorption is potentially an attractive methodology for removal of hazardous dyestuff from industrial effluents. In this study, the removal efficiency of industrially important dyes methylene blue (MB) and methyl orange (MO) from aqueous solution using jute leaves (JL) and sickle senna leaves (SSL), and activated carbon of jute and sickle senna leaves A C-SSL and AC-JL as Adsorbents had been investigated. The prepared adsorbents were characterized using Fourier Transform Infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM) and Energy Dispersive X-ray, (EDX). The effect of different parameters such as contact time, temperature, initial dye concentration, adsorbent dosage and pH were studied. The results obtained revel that the optimum time at 60 minutes and 50 minutes, acidic pH of 2 and 0.5g and 0.6g respectively, the experimental data were interpreted and studied using. Four isotherm models namely Langmuir, Freundlich, Temkin and Dubenin Redushkebich were tested and adsorption was found to fit well into Langmuir model and Temkin relatively better than others. The maximum loading capacity (qm) of the adsorbent AC-MOJLA is 248 and AC-MBJLB is 245 respectively. Adsorbtion kinetics parameters such as Pseudo first order, Pseudo second order, Intra particles diffusion and Simple elovich were used to described the data, the investigations showed that the kinetic data was well described by Pseudo first order and Pseudo second order kinetic model with the high correlation coefficients (R2). Thermodynamic parameters such as ∆G, ∆H, ∆S, were calculated. The negative values of ∆G, indicate that the process is spontaneous in nature and the positive values of ∆H, shows the endothermic nature of the process. The positive values of ∆S indicated that the randomness of the solid/solution interface increased during the adsorption process. The activation energy also was calculated. The FTIR and SEM analyses of the adsorbent suggest that adsorption of the dyes was through an electrostatic interaction between the functional groups present in the dyes and those on the surface of the adsorbent.

ABSTRACT The corrosion inhibition efficiency of ethanolic extract of Balanites aegyptiaca leave on the corrosion of Zinc in HCl solution has been investigated using weight loss and potentiodynamic polarization. The corrosion inhibition properties were investigated using FTIR, PDP, SEM and weight loss. The results of inhibition efficiency obtained from weight loss and potentiodynamic polarization were 42.41% and 65.69% respectively. The tafel plot from potentiodynamic polarization proved that the inhibition process was anodic inhibitor on the surface of Zinc metal. The adsorption isotherm data were consistent and best fitted to Frumkin isotherm model in the extracts. The adsorption process indicated feasible and spontaneous process from the large negative values of change in Gibb’s free energy of adsorption for BE solutions. The values of change in enthalpy of adsorption for BE were all positive indicating endothermic process and the positive values of change in entropy of adsorption for BE shows that and increase in disorder takes place on moving from reactant to the activation complex. The results also revealed that the activation energies increase with increase in concentration of BE. The corrosion reaction process fitted more with first order of reaction kinetic model due to its highest value of R2 closed to unity. The results of FTIR spectra showed that the extract were adsorbed on the Zinc surface through physisorption mechanism as proposed by the kinetics and thermodynamic data. The scanning electron microscope results showed the formation of adsorbed extract molecules on zinc which reduced the corrosion rate.