Hydroxylamine enhanced Fe3O4/H2O2 system for removing tartrazine

In recent years, dye wastewater caused serious effects on environmental ecology and human health. Thus, in the present study, hydroxylamine (HA) was used to improve the Fe 3 O 4 /H 2 O 2 process for removing the typical dye pollutant (tartrazine). Only 2.8% tartrazine could be removed in Fe 3 O 4 /H 2 O 2 system within 60 min at the reaction of 1 g/L Fe 3 O 4 , 1 mM H 2 O 2 , and pH 4 while 97.5% tartrazine could be removed within 20 min after adding 1 mM HA into the Fe 3 O 4 /H 2 O 2 system. Compared with Fe 3 O 4 /H 2 O 2 system, the removal rate for removing tartrazine in Fe 3 O 4 -HA/H 2 O 2 system could enhance more than 100 times. Electron paramagnetic resonance tests (EPR), radical quenching experiments and quantitative determination demonstrated that • OH was the major reactive species for removing tartrazine in Fe 3 O 4 -HA/H 2 O 2 system and • OH produced concentration in Fe 3 O 4 -HA/H 2 O 2 system was also much higher than that in Fe 3 O 4 /H 2 O 2 system. The key factors affecting tartrazine removal in Fe 3 O 4 -HA/H 2 O 2 system were also conducted. The optimal HA dosage, Fe 3 O 4 dosage, and H 2 O 2 dosage was 1 mM, 1 g/L and 1 mM. The optimal initial pH in Fe 3 O 4 -HA/H 2 O 2 system was 3, but compared with Fe 3 O 4 /H 2 O 2 system, the tatrazine removal efficiency could significantly improve under any initial pH condition. Fe 3 O 4 -HA/H 2 O 2 process had strong adaptability to inorganic ions and good applicability to different pollutants. Fe 3 O 4 -HA/H 2 O 2 process also exhibited good recycle ability for tartrazine removal. Overall, Fe 3 O 4 -HA/H 2 O 2 process is an effective and good practical applicability approach for dye wastewater treatment.