Heterogeneous photo Fenton-like degradation of cibacron brilliant red 3B-A dye using amorphous Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3 alloys: The influence of adsorption
Taiwan Institute of Chemical Engineers
Place of Publication
School of Engineering
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 Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3 ribbons is 7.60 mg/g and 0.35 mg/g, respectively, leading to faster dye degradation by using Fe78Si9B13 compared to Fe73.5Si13.5B9Cu1Nb3 ribbons. The equilibrium adsorption data is well fitted to Langmuir and Freundlich isotherms. The calculated qe from the 2nd kinetic model (7.36 mg/g) and qm 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 H2O2 concentration are detailed discussed. 100% color removal with a reaction rate k = 0.668 is achieved within 5 min by using Fe78Si9B13 ribbons, whereas it requires 20 min with k = 0.184 for Fe73.5Si13.5B9Cu1Nb3 ribbons. The total organic carbon removals of BR3B-A for both Fe78Si9B13 and Fe73.5Si13.5B9Cu1Nb3 are more than 70% within 30 min, revealing dye molecules are rapidly mineralized to H2O, CO2, NO3−, and SO42−. Empirical operating variables for dye degradation are under pH 2, light irradiation 7.7 µW/cm2, catalyst dosage 2.0 g/L and H2O2 concentration 1.0 mM.