Regeneration of activated carbon adsorbent by anodic and cathodic electrochemical process

Santos, Danilo H.S.; Santos, João P.T.S.; Duarte, José L. S.; Oliveira, L. M. T. M.; Tonholo, Josealdo; Meili, Lucas; Zanta, Carmem Lúcia de Paiva e Silva

doi:10.1016/j.psep.2022.01.083

Cited by 36 publications

(3 citation statements)

References 81 publications

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“…While RDX was used as the model pollutant, this method can be extended to analogous MCs as well as the more persistent IHEs that are emerging as a class of pollutants. Recent literature into the electrochemical regeneration of saturated activated carbon reveals a promising future for the extended operability and economic feasibility of this technology, in that electrochemical systems improve the reusability of sorption materials made from carbonaceous precursors ( Santos et al, 2022 ). By implementing the AC-Mn5 heterogenous catalyst in a system such as this, the lifetime and effective use of these materials may be extended.…”

Section: Discussionmentioning

confidence: 99%

Heterogeneous Fenton-Like Catalysis of Electrogenerated H2O2 for Dissolved RDX Removal

et al. 2022

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New insensitive high explosives pose great challenges to conventional explosives manufacturing wastewater treatment processes and require advanced methods to effectively and efficiently mineralize these recalcitrant pollutants. Oxidation processes that utilize the fundamental techniques of Fenton chemistry optimized to overcome conventional limitations are vital to provide efficient degradation of these pollutants while maintaining cost-effectiveness and scalability. In this manner, utilizing heterogeneous catalysts and in-situ generated H2O2 to degrade IHEs is proposed. For heterogeneous catalyst optimization, varying the surface chemistry of activated carbon for use as a catalyst removes precipitation complications associated with iron species in Fenton chemistry while including removal by adsorption. Activated carbon impregnated with 5% MnO2 in the presence of H2O2 realized a high concentration of hydroxyl radical formation - 140 μM with 10 mM H2O2 - while maintaining low cost and relative ease of synthesis. This AC-Mn5 catalyst performed effectively over a wide pH range and in the presence of varying H2O2 concentrations with a sufficient effective lifetime. In-situ generation of H2O2 removes the logistical and economic constraints associated with external H2O2, with hydrophobic carbon electrodes utilizing generated gaseous O2 for 2-electron oxygen reduction reactions. In a novel flow-through reactor, gaseous O2 is generated on a titanium/mixed metal oxide anode with subsequent H2O2 electrogeneration on a hydrophobic microporous-layered carbon cloth cathode. This reactor is able to electrogenerate 2 mM H2O2 at an optimized current intensity of 150 mA and over a wide range of flow rates, influent pH values, and through multiple iterations. Coupling these two optimization methods realizes the production of highly oxidative hydroxyl radicals by Fenton-like catalysis of electrogenerated H2O2 on the surface of an MnO2-impregnated activated carbon catalyst. This method incorporates electrochemically induced oxidation of munitions in addition to removal by adsorption while maintaining cost-effectiveness and scalability. It is anticipated this platform holds great promise to eliminate analogous contaminants.

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Section: Discussionmentioning

confidence: 99%

Heterogeneous Fenton-Like Catalysis of Electrogenerated H2O2 for Dissolved RDX Removal

et al. 2022

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“… [ 70 ] Commercial methylene blue Electrochemical scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), X-ray Diffraction (XRD) Amount of MB adsorbed in successive adsorption–regeneration cycles. - [ 100 ] Commercial Rhodamine B Ultrasonic (Sono-Fenton) Amount of Rhodamine B adsorbed association of two techniques [ 35 ] commercial Rhodamine B electro-peroxone Amount of Rhodamine B adsorbed; AC characterization ozonation regeneration could not effectively mineralize the desorbed pollutants due to the selective oxidation characteristics of ozone (O3) [ 101 ] Commercial Basic Blue 9 and Acid Blue 93 microwave Amount of Basic Blue 9 and Acid Blue 93 adsorbed - [ 84 ] Commercial Acid orange 7 Microwave Amount of Acid orange 7 adsorbed; AC characterization changes on the structural properties, surface chemistry and the AO7 adsorption capacities of AC [ 102 ] …”

Section: Main Challengesmentioning

confidence: 99%

Regeneration of dye-saturated activated carbon through advanced oxidative processes: A review

Santos

Xiao

Chaukura

et al. 2022

Heliyon

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“…This approach was found to be quite successful (antiviral drug removal efficiency of 58.5–90) [59] , [67] . In addition, the adsorbent materials can be fabricated from agricultural residues and offer an economical alternative because of their low cost [170] . Therefore, there is a need for more studies on the treatment of antiviral drugs from water/wastewater using an adsorption process with different low-cost adsorbents.…”

Section: Future Perspectivesmentioning

confidence: 99%

A sustainable approach for the removal methods and analytical determination methods of antiviral drugs from water/wastewater: A review

Eryıldız

Gül

Koyuncu

2022

Journal of Water Process Engineering

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Regeneration of activated carbon adsorbent by anodic and cathodic electrochemical process

Cited by 36 publications

References 81 publications

Heterogeneous Fenton-Like Catalysis of Electrogenerated H2O2 for Dissolved RDX Removal

Heterogeneous Fenton-Like Catalysis of Electrogenerated H2O2 for Dissolved RDX Removal

Regeneration of dye-saturated activated carbon through advanced oxidative processes: A review

A sustainable approach for the removal methods and analytical determination methods of antiviral drugs from water/wastewater: A review

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