Sustainable degradation of carbon tetrafluoride to non-corrosive useful products by incorporating reduced electron mediator within electro-scrubbing

Abstract

Please refer to any applicable publisher terms of use. Highlights  A Cu 2+ [Ni 2+ (CN)4] complex was established for carbon tetrachloride degradation to non-corrosive useful product  ORP and ESR results demonstrated Cu 1+ formation at cathodic half-cell during electrolysis  Mass transfer analysis identifies rate limiting behavior and routes to optimization  Ethanol found to be a main product in the degradation of CF4 my MER at electroscrubbing

Sustainable removal of N2O by mediated electrocatalytic reduction at ambient temperature electro-scrubbing using electrogenerated Ni(I) electron mediator

“…In addition, homogeneous [Ni(I)(CN)4] 3was generated electrochemically on a Cu metal electrode at cathodic half-cell by constant current electrolysis for the first time and used to remove gaseous CCl4 by MER (mediated electrochemical reduction) at electroscrubbing [32]. In a very recent study on carbon tetrafluoride (CF4) degradation, electrochemical production of mediator Cu 1+ facilitated a regenerative chemical reaction at room temperature, resulting in product transformation to trifluoroethane and ethanol without HF using Cu 1+ [Ni 2+ (CN)4] 1- [33]. Hence, electroscrubbing enables process intensification through the provision of separation and product transformation within a single stage, simultaneously generating a product of commercial value that can improve the return on investment.…”

Assessing the viability of electro-absorption and photoelectro-absorption for the treatment of gaseous perchloroethylene

“…Additionally treatment of gases can be carried out directly in gas phase using electrochemical cells equipped with solids electrolytes (Barge and Vaidya, 2019;Muthuraman et al, 2018), either polymer exchange membranes or solid oxides (Monteiro et al, 2015;. Alternatively, it can be carried out in liquid phase (Miao et al, 2015;Sáez et al, 2010;Sáez et al, 2009), following the absorption (ABS) of the gas into a liquid, which is not only an absorbent of the separation unit but also the electrolyte of the electrochemical cell (Muthuraman and Moon, 2012).…”

Continuous electro-scrubbers for the removal of perchloroethylene: Keys for selection

“…Thus, silver (throughout the Ag(I)/Ag(II) redox mediator pair) has been used for the removal of nitrogen oxides [19] [20], mixtures of NOx and SO2 [21] and odorous substances such as CH3SH and H2S [22]. Nickel has been used as electro-catalyst for the removal of halogenated substances such as C2HCl3 [23], CF4 [24] and CCl4 [25] and for atmospheric pollutants such as NO [26] and N2O [27].…”