Accelerated degradation of orange G over a wide pH range in the presence of FeVO4
Xiaoxia Ou, Jianfang Yan, Fengjie Zhang, Chunhua Zhang
Accelerated degradation of orange G over a wide pH range in the presence of FeVO4
The applicability of FeVO4 extended the optimum pH range for heterogeneous Fenton process towardsneutral conditions.
The datas for the removal of OG in FeVO4 systems conform to the Langmuir–Hinshelwood model.
The irradiation of FeVO4 by visible light significantly increases the degradation rate ofOG due to the enhanced rates of the iron and vanadium cycles.
In this study, FeVO4 was prepared andused as Fenton-like catalyst to degrade orange G (OG) dye. The removalof OG in an aqueous solution containing 0.5 g·L-1 FeVO4 and 15 mmol·L-1 hydrogen peroxide at pH 7.0 reached 93.2%. Similar rates were achievedat pH 5.7 (k = 0.0471 min-1), pH 7.0 (k = 0.0438 min-1), and pH 7.7 (k = 0.0434 min-1). The FeVO4 catalyst successfullyovercomes the problem faced in the heterogeneous Fenton process, i.e.,the narrow working pH range. The data for the removal of OG in FeVO4 systems containing H2O2 conform to the Langmuir–Hinshelwood model (R2 = 0.9988),indicating that adsorption and surface reaction are the two basicmechanisms for OG removal in the FeVO4–H2O2 system. Furthermore, the irradiationof FeVO4 by visible light significantly increasesthe degradation rate of OG, which is attributed to the enhanced ratesof the iron cycles and vanadium cycles.
Azo dye / Degradation / FeVO4 / Kinetics / Advanced oxidation processes
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