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In this article, Fe-doped carbon aerogels from sodium alginate were used for the removal of methylene blue (MB) in water. Under acidic condition, the sample carbonized at 700 °C (T700) undergoes Fe-C micro-electrolysis to produce highly chemically active Fe 2+  and [H] to degrade MB. Under neutral or alkaline conditions, Fe 2+  produced by Fe-C micro-electrolysis become Fe(OH) 3 , which can effectively adsorb MB. In addition, when T700 combines with H 2 O 2  to form Fenton system, the MB removal efficiency was significantly improved. The Fe-doped carbon aerogels can be used in wastewater treatment and when combine the materials with H 2 O 2  can greatly improve the MB removal efficiency.

Fe-doped carbon aerogels from sodium alginate for the removal of methylene blue