Rapid degradation of methyl orange with nanoscale zerovalent iron particles
Journal
Sustainable Environment Research
Journal Volume
20
Journal Volume
20
Journal Issue
3
Journal Issue
3
Pages
137-143
Start Page
137
End Page
143
ISSN
24682039
Date Issued
2010
Author(s)
Abstract
Refractory azo-dye compounds used in the texture industry are commonly detected in texture wastewater. In this study we investigated the reduction kinetics and efficiency of methyl orange, one of azo-dyes, with laboratory synthesized nanoscale zero-valent iron, ZVI (NZVI) particles in relation to the NZVI dosage, temperature and pH. The degradation of methyl orange with NZVI occurs at a much faster rate than with microscale ZVI. Increasing the dose of NZVI particles enhanced the decolorization rates of methyl orange. The reaction rate constants decreased with increasing solution pH but increased with increasing temperature. The activation energy was estimated to be 22.7 kJ mol−1. These findings demonstrated the fast removal of azo-dye compound with NZVI and the advantage of the synthesized NZVI particles to treat azo-dye-contaminated wastewater.
Subjects
Activation energy
Azo-dye
pH
Temperature
Zerovalent iron nanoparticles
Publisher
Chinese Institute of Environmental Engineering
Type
journal article