Manipulate an air–cathode fuel cell toward recovering highly active heterogeneous electro-Fenton catalyst from the Fe(II) in acid mine drainage

In Situ Fabrication of Electro-Fenton Catalyst from Fe2+ in Acid Mine Drainage: Influence of Coexisting Metal Cations

“…Metal cations and NaHCO 3 were then added to the anodic chamber and solution pH was adjusted to 7.5. 9 In some experiments, real AMDs were used as the anodic solution. The AMDs were collected from two mining sites in Anhui, China, and stored without exposure to air.…”

“…8,9 The primary advantage of such an AC-FC approach is the realization of simultaneous reagent-free removal of Fe 2+ in AMD and in situ fabrication of iron oxide/carbon composites. Notably, the prepared Fe 3 O 4 /carbon composite has found great potential as the cathode material of heterogeneous electro-Fenton (EF) process, 9 which is a typical electrochemical advanced oxidation process for the treatment of organic pollutants by making use of hydroxyl radicals (HO • ) generated at the cathode. 10 The superior catalytic activity of Fe 3 O 4 /carbon composite to the EF reaction is attributed to both the active surface provided by the carbon support for the two-electron reduction of O 2 into hydrogen peroxide (H 2 O 2 ) and the catalytic activity of Fe 3 O 4 for the conversion of H 2 O 2 into HO • .…”

“…Then, various iron oxide/carbon composites, including FeOOH/carbon, Fe 2 O 3 /carbon, and Fe 3 O 4 /carbon, can be obtained after subsequent calcination treatment. , The primary advantage of such an AC-FC approach is the realization of simultaneous reagent-free removal of Fe 2+ in AMD and in situ fabrication of iron oxide/carbon composites. Notably, the prepared Fe 3 O 4 /carbon composite has found great potential as the cathode material of heterogeneous electro-Fenton (EF) process, which is a typical electrochemical advanced oxidation process for the treatment of organic pollutants by making use of hydroxyl radicals (HO • ) generated at the cathode . The superior catalytic activity of Fe 3 O 4 /carbon composite to the EF reaction is attributed to both the active surface provided by the carbon support for the two-electron reduction of O 2 into hydrogen peroxide (H 2 O 2 ) and the catalytic activity of Fe 3 O 4 for the conversion of H 2 O 2 into HO • …”

Mine Drainage Generation and Control Options

“…A novel air-cathode fuel cell strategy to utilize insitu ferrous iron in the AMD for the fabrication of heterogeneous electro-Fenton catalysts was proposed (Sun et al, 2015b). Three types of nano-structured iron oxide/graphite felt (GF) composites, including FeOOH/GF, Fe2O3/GF and Fe3O4/GF, were fabricated from synthetic AMD and their catalytic activities towards the electro-Fenton reaction were evaluated at neutral pH with Rhodamine B (RhB) as a probe pollutant.…”

Mine waste or future resource? Integrating industrial ecology thinking into a mining project

“…Installing leachate collection systems in waste deposits is a way to both control seepage and potentially collect metal-rich effluents for reprocessing. Indeed, many authors propose to recover metals directly from AMD waters (e.g El- Ashtoukhy & Abdel-Aziz 2013;Sánchez-Andrea et al 2014;Sun et al 2015)…”