Heterogeneous Fenton degradation of bisphenol A catalyzed by efficient adsorptive Fe3O4/GO nanocomposites

Abstract

A new method for the degradation of bisphenol A (BPA) in aqueous solution was developed. The oxidative degradation characteristics of BPA in a heterogeneous Fenton reaction catalyzed by Fe3O4/graphite oxide (GO) were studied. Transmission electron microscopic images showed that the Fe3O4 nanoparticles were evenly distributed and were ∼6 nm in diameter. Experimental results suggested that BPA conversion was affected by several factors, such as the loading amount of Fe3O4/GO, pH, and initial H2O2 concentration. In the system with 1.0 g L(-1) of Fe3O4/GO and 20 mmol L(-1) of H2O2, almost 90% of BPA (20 mg L(-1)) was degraded within 6 h at pH 6.0. Based on the degradation products identified by GC-MS, the degradation pathways of BPA were proposed. In addition, the reused catalyst Fe3O4/GO still retained its catalytic activity after three cycles, indicating that Fe3O4/GO had good stability and reusability. These results demonstrated that the heterogeneous Fenton reaction catalyzed by Fe3O4/GO is a promising advanced oxidation technology for the treatment of wastewater containing BPA.

Effects of temperature on adsorption and oxidative degradation of bisphenol A in an acid-treated iron-amended granular activated carbon

“…Similar BPA removal efficiencies at various temperatures were thought to be mainly due to different reaction time at which most of H 2 O 2 was consumed (please note that complete consumption of H 2 O 2 occurred 30 h for 293 K and 6 h for 333 K). [54,55]. It was reported that the Fenton oxidation of BPA at low dose of H 2 O 2 generated the aromatic products such as hydroquinone, 4 0 -hydroxyacetophenone, 4 0 -isoproenylphenone, and catechol as the major oxidative products.…”

Heterogeneous Fenton degradation of bisphenol A by carbon nanotube-supported Fe3O4

“…The scavenging efficiency was estimated by using the following equation [62]: [64,65]. Among various intermediates and oxidative products, the aromatic products such as hydroquinone, 4 0 -hydroxyacetophenone (4-HAP), 4 0 -isoproenylphenone, and catechol were commonly detected as the major oxidative products.…”

Heterogeneous photo-Fenton degradation of methyl orange by Fe2O3/TiO2 nanoparticles under visible light

“…An alternative method can be the use of heterogeneous Fenton catalysts. Many heterogeneous Fenton catalysts have recently reported, such as iron oxides [14,15], and iron-immobilized materials [16], However, the heterogeneous Fenton reaction can oxidize aqueous contaminants at broader pH and reduce release of iron in water after treatment, it has low reaction rate and treatment efficiency due to the low reactivity of the initial reaction between iron oxide and H 2 O 2 to produce • OH [17].…”