Nanoscale zero valent iron particles (nzvi): an effective solution for methyl orange azo dye removal
1 Tamil Nadu Agricultural University, Department of Environmental Sciences, Coimbatore, India
2 Bannari Amman Institute of Technology, Sathyamangalam, Department of Chemistry, Tamil Nadu, India
3 Kerala Agricultural University, Vellanikkara, Kerala, India
4 Tamil Nadu Agricultural University, Department of Soil Science & Agricultural Chemistry, Coimbatore, India
2 Bannari Amman Institute of Technology, Sathyamangalam, Department of Chemistry, Tamil Nadu, India
3 Kerala Agricultural University, Vellanikkara, Kerala, India
4 Tamil Nadu Agricultural University, Department of Soil Science & Agricultural Chemistry, Coimbatore, India
Abstract
Nanoscale Zero Valent Iron (nZVI) particles were used to remove color from a water-soluble azo dye, methyl orange, using batch and column experiments. The particles rapidly reduced the color, reaching equilibrium within 20 minutes. Complete color removal was achieved using 0.6 g L-1 of nZVI when the initial concentration of methyl orange was 100 mg L-1, and the pH was 3. The maximum decolorization ratio of 97% was achieved within 10 minutes, with the pH playing a significant role.Gas Chromatography-Mass Spectrometry (GC-MS) was used to analyze the decolorization products, revealing that 98% of the MO was converted to N, N-dimethyl-.-phenylenediamine by the nZVI particles. Additionally, the equilibrium relationship between the sorbent and sorbate was determined. Besides, Kinetic studies provided insights into the adsorption rate and its mechanisms.
Keywords
adsorption; decolorization; methyl orange; kinetics; Nanoscale Zero Valent Iron (nZVI)