O-doped Graphitic Granular Biochar Enables Pollutants Removal via Simultaneous HO Generation and Activation in Neutral Fe-free Electro-Fenton Process.

HO generation by 2-electron oxygen electroreduction reaction (2eORR) has attracted great attention as an alternative to the industry-dominant anthraquinone process. Electro-Fenton (EF) process, which relies on the HO electrogeneration, is regarded as an important environmental application of HO generation by 2eORR. However, its application is hindered by the relatively expensive electrode materials.

Efficient HO electrogeneration at graphite felt modified via electrode polarity reversal: Utilization for organic pollutants degradation.

Electrochemical synthesis of HO offers a great potential for water treatment. However, a significant challenge is the development of efficient cathode materials for the process. Herein, we implement a practical electrochemical cathode modification to support efficient HO electrogeneration via the reduction of dissolved anodic O.

"Self-cleaning" electrochemical regeneration of dye-loaded activated carbon.

A low maintenance, "self-cleaning" electrochemical approach is evaluated for regeneration of dye-loaded granular activated carbon (GAC). To do so, batch experiments were conducted using a low-cost granular activated carbon/stainless steel mesh (GACSS) composite cathode and a stable Ti/mixed metal oxides (Ti/MMO) anode without the addition of oxidants or iron catalysts. The GACSS cathode supports simultaneous HO electrogeneration via the supplied O from Ti/MMO anode and the subsequent HO activation for ·OH generation, thus enabling the cracking of dye molecules adsorbed on GAC and regenerating the GAC's sorption capacity.