(423f) Effective Adsorption of Chromium from Tannery Wastewater Using Green Synthesis Nano-Zero Valent Iron (GT-nZVI) | AIChE

(423f) Effective Adsorption of Chromium from Tannery Wastewater Using Green Synthesis Nano-Zero Valent Iron (GT-nZVI)

Authors 

Mahmoud, A. S., Housing and Building National Research Center
Noureldin, A. M., Housing and Building National Research Center
Nowadays, Egypt built the biggest industrial area for tanning industries; this industry produces a vast amount of chromium in the tannery wastewater effluent. This study successfully prepared and characterized GT-nZVI by reducing agents extracted from soft black tea. The prepared GT-nZVI was characterized using x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive analysis of x-rays (EDAX) analysis. The chromium removal efficiency reached 97.1% and 73.7% from an initial chromium concentration of 1.0 and 9.0 mg/L, respectively. The optimum removal efficiencies were achieved using 0.6 g/L GT-nZVI at acidic pH 5 after 30 min of shaking at a rate of 250 rpm. The equilibrium isotherm and kinetic results indicated that the adsorption of chromium onto GT-nZVI agrees with the Koble-Corrigan model with the lowest summation of errors of 0.394 and a Pseudo-Second-Order adsorption with the lowest summation of errors of 0.07. An artificial neural network (ANNs) was built to describe the factors affecting the adsorption process by 6 inputs, 4 hidden layers, and 1 output. The results obtained indicated that the initial concentration and GT-nZVI dose are the most significant variables that influence the adsorption process. The response surface methodology (RSM) equation was developed to allow the prediction of chromium removal efficiency at different operating parameters. Finally, this study strongly supports using GT-nZVI for chromium removal from tannery effluents.

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