REMOVAL OF ACID ORANGE II DYE BY GRANITIC NANO-ZERO VALENT IRON (nZVI) COMPOSITE

Abstract

The study highlights the effectiveness of nanoscale zero-valent iron (nZVI) composite in
removing Acid Orange II dye. In this study, granitic residual soil has been used as supported material to
stabilize the nanoscale zero-valent iron (nZVI) and to improve its adsorption capacity. The physical, chemical,
mineralogical and morphological properties of the successfully synthesized granitic nano zero valent iron (GrnZVI) have been analyzed by Brunnaer–Emmett–Teller (BET) surface area, X-ray Photoelectron Spectroscopy
with Auger Electron Spectroscopy (XPS-AES), Field Emission Scanning Electron Microscopy (FESEM), and
X-Ray Diffraction (XRD). The batch adsorption tests for the granitic residual soil (Gr) and the granitic nanozero valent iron (Gr-nZVI) on Acid Orange II have been conducted to determine the effectiveness of both
materials in dye removal. The five effects analyzed in the Batch test are concentration, dose, pH, kinetic and
temperature. It was found that Gr-nZVI has higher absorption capacity compared to Gr. The effectiveness of
Gr-nZVI composite in dye adsorption is due to the dispersion of nZVI particles on granitic soil particles,
consequently providing more sites for adsorption. The results suggest that Gr-nZVI has potential as low-cost
adsorbent for Acid Orange II removal from synthetic dye wastewater.