NANOSCALE ZERO VALENT IRON PARTICLES (nZVI): AN EFFECTIVE SOLUTION FOR METHYL ORANGE AZO DYE REMOVAL

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.