Highly Ordered Mesoporous Fe₃O₄@Carbon Embedded Composite: High Catalytic Activity, Wide pH Range and Stability for Heterogeneous Electro‐Fenton

Abstract

Highly ordered mesoporous Fe3O4@carbon embedded composite was prepared and grafted onto monolithic carbon aerogel to form a composite cathode (Fe3O4@OMC/CA). The Fe3O4@OMC/CA was used as heterogeneous electro‐Fenton cathode for the degradation of dimethyl phthalate (DMP). 95 % removal and 65 % mineralization of DMP was achieved within 120 min. Highly dispersed Fe3O4 nanoparticles increased the number of catalytic active sites, and the OMC layer provided accessible pathway to the catalytic active sites and reduced the resistance of mass transport. The main oxidants were ⋅OH and the surface‐controlled heterogeneous catalysis was the critical step. The composite cathode remained electrocatalytic activity after five consecutive runs.

Surface Modification of Graphite Support as an Effective Strategy to Enhance the Electro-Fenton Activity of Fe3O4/Graphite Composites in Situ Fabricated from Acid Mine Drainage Using an Air-Cathode Fuel Cell

“…Such values are comparable to or even higher than those reported for carbonaceous cathodes in literature (Table S1). The high activity of GF-N 2 H 4 for the electrogeneration of H 2 O 2 is attributed to its surface oxygenated functional groups and doped nitrogen atoms which serve as active sites for the two-electron O 2 reduction reaction, , as well as its hydrophilic nature that favors the transfer of dissolved O 2 to the electrode …”

Electrochemical mineralization of sulfamethoxazole over wide pH range using FeIIFeIII LDH modified carbon felt cathode: Degradation pathway, toxicity and reusability of the modified cathode

“…Also, the need for post-treatment neutralization and formation of iron-rich sludge encounter in conventional EF system is completely eliminated with the use of solid catalyst. Based on literature, heterogeneous catalysts such as natural Fe minerals [15][16][17][18][19], supported transition metal/metal oxides [11,[20][21][22][23][24], and transition metals dopedcarbon aerogel [25][26][27][28] have been studied for degradation of the various class of organic pollutants. Excellent mineralization of organics as a result of both homogeneous and surface catalyzed process has been reported for iron containing minerals as heterogeneous catalysts in HEF especially at acid pH, however such system demonstrated low recyclability.…”

Improved Magnetite Nanoparticle Immobilization on a Carbon Felt Cathode in the Heterogeneous Electro-Fenton Degradation of Aspirin in Wastewater

“…The XRD 2θ characteristic peaks ( Figure 1 b) at 30.2, 35.5 (highest intensity), 43.2, 57.1, and 62.7° confirm the successful synthesis of magnetite nanoparticles for all the Fe 2+ /Fe 3+ ratios. 40 , 41 The ratio of Fe 2+ /Fe 3+ seems to affect the crystallinity of the magnetite. As seen in Figure 1 b, the diffractogram of Fe 2+ /Fe 3+ 1:4 is more crystalline than that of Fe 2+ /Fe 3+ 1:1 owing to increase in the Fe 3+ content.…”