Abstract
The pollution of heavy metal and organic pollutants is a global environmental issue. Up to now, the simultaneous removal of heavy metal and organic pollutants is still a great challenge. The removal of heavy metal and organic pollutants by zero-valent iron (ZVI) has been extensively studied, but the removal efficiency of pollutants is low using single ZVI for remediation application. In this paper, a low-cost method by ZVI in presence of ethylenediaminetetraacetic acid (EDTA) and oxalate ligands has been developed to simultaneously remove Cr(VI) and dye from wastewater. This innovative process combines the reduction of Cr(VI) to Cr(III) with the reduction/oxidation of the dye by ZVI with the aid of ligand. EDTA and oxalate ligands can significantly increase the removal efficiency of Cr(VI) and dye since the ligands can accelerate ferrous iron oxidation and increase the generation of hydroxyl radical. In contrast, oxalate ligand possessed better removal efficiency in simultaneous removal process than EDTA, and oxalate generated lower TOC than EDTA. At the optimal conditions, the removal efficiency higher than 98% for Cr(VI) and higher than 81% for dye was observed in presence of 3.0mM oxalate. X-ray Photoelectron Spectroscopy, Fourier Transform Infrared Spectroscopy and UV–visible spectrometer were used to study the reaction mechanism among Cr(VI), ZVI and dye in presence of ligand.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.