Synergy of combined adsorption and electrochemical degradation of aqueous organics by granular activated carbon particulate electrodes

Recent advances in electrocatalysts for halogenated organic pollutant degradation

“…135 Granular activated carbon (AC) often acts as a particulate electrode in the electrolysis system, which can enhance the overall active electrode area, conductivity, and mass transfer and improve the electrochemical degradation kinetics and COD removal ratio. 136 Pedersen et al 137 explored the synergy of AC adsorption and electrochemical degradation in the mineralization of 2-methyl-4-chlorophenoxy acetic acid (MCPA) and 2-methyl-4-chlorophenoxy propionic acid (MCPP). Their results indicated that synergies of 121-126% were found for MCPA and MCPP at w/w AC: the organic ratio of 5:1, with an electric field strength of 375 V•m -1 .…”

Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems

“…Granular activated carbon (GAC) is widely studied as a third electrode due to its interesting surface properties such as high surface area, high porosity and active surface chemistry [9][10][11][12]. The improvement of three-dimensional electrochemical systems (using GACs as the third electrode) was attributed to its extensive specific surface area [13][14][15] and the ability of carbon materials to promote the generation of hydrogen peroxide by an oxygen reduction reaction [16][17][18].…”

“…Nevertheless, when GAC is applied as the third electrode, the efficiency of the technology depends mostly on the adsorption properties of the organic micropollutants [19,20]. For instance, some compounds such as phenoxy-acid herbicides have less tendency to adsorb to the carbon [10], resulting in low adsorption capacity and low removal efficiency in these systems. Research on technologies for the removal of persistent organic contaminants including pesticides from groundwater has been the focus for several years, either as part of groundwater-based drinking water production or as pump-n-treat solutions used in groundwater remediation.…”

“…Research on technologies for the removal of persistent organic contaminants including pesticides from groundwater has been the focus for several years, either as part of groundwater-based drinking water production or as pump-n-treat solutions used in groundwater remediation. In countries such as Denmark, research in this area has recently increased [10,21,22] due to large non-target analytical screenings of groundwater aquifers revealing significant pesticide contamination of a greater extent than previously expected [21][22][23]. Therefore, the development of efficient and cost-effective treatment technologies for pesticides removal is of high concern.…”

Degradation of p‐aminophenol wastewater using Ti‐Si‐Sn‐Sb/GAC particle electrodes in a three‐dimensional electrochemical oxidation reactor

“…[15] Compared with the two-dimensional electrochemical oxidation reactor, it has several advantages, including abundant catalytic active sites, high mass transfer efficiency, and greatly improves the removal efficiency of the refractory organic matter. [16,17] Various particle, such as ceramics, [18] γ-Al 2 O 3, [19] kaolin [20] and granular activated carbon (GAC) [21] had been used as the particle electrodes in the electrochemical oxidation reactor. Among these particle electrodes, GAC was widely used for its good electrical conductivity, high specific surface area and low price.…”