Heterogeneous photo Fenton-like degradation of cibacron brilliant red 3B-A dye using amorphous Fe 78 Si 9 B 13 and Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 alloys: The influence of adsorption

Abstract

Abstract In this work, the influence of brilliant red 3B-A dye adsorption on dye degradation using two amorphous ribbons is investigated. The quantity of dye adsorption on Fe 78 Si 9 B 13 and Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 ribbons is 7.60 mg/g and 0.35 mg/g, respectively, leading to faster dye degradation by using Fe 78 Si 9 B 13 compared to Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 ribbons. The equilibrium adsorption data is well fitted to Langmuir and Freundlich isotherms. The calculated q e from the 2nd kinetic model (7.36 mg/g) and q m from Langmuir equation (12.76 mg/g) are very close to experimental data of 7.6 mg/g and 13.07 mg/g, respectively. The effects on dye degradation efficiency under varied parameters including pH, light intensity, catalyst dosage and H 2 O 2 concentration are detailed discussed. 100% color removal with a reaction rate k = 0.668 is achieved within 5 min by using Fe 78 Si 9 B 13 ribbons, whereas it requires 20 min with k = 0.184 for Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 ribbons. The total organic carbon removals of BR3B-A for both Fe 78 Si 9 B 13 and Fe 73.5 Si 13.5 B 9 Cu 1 Nb 3 are more than 70% within 30 min, revealing dye molecules are rapidly mineralized to H 2 O, CO 2 , NO 3 − , and SO 4 2 − . Empirical operating variables for dye degradation are under pH 2, light irradiation 7.7 µW/cm 2 , catalyst dosage 2.0 g/L and H 2 O 2 concentration 1.0 mM.