title: Innovative reductive remediation of carbon tetrafluoride at room temperature by using electrogenerated Co1.
abstract: Among the non-CO2greenhouse gases, carbon tetrafluoride (CF4) is the most recalcitrant and should be eliminated from the atmosphere. In the present study, a non-combustion electroscrubbing method was used in an attempt to degrade CF4with an electrogenerated Co1+mediator in a highly alkaline medium. The initial absorption experiments revealed 165mgL-1CF4gas dissolved in 10M NaOH. Different mediator precursors, [Co(II)(CN)5]3-, [Ni(II)(CN)4]2-, [Cu(II)(OH)4]2-, and [Co(II)(OH)4]2-, were used and the electroscrubbing results showed that the electrogenerated Co1+or [Co(II)(OH)4]2-precursor effectively degraded up to 99.25% of the CF4gas. The variations in [Co(II)(OH)4]2-reduction efficiency and cyclic voltammetry revealed CF4degradation followed by electrogenerated Co1+mediated reduction. The increased zeta potential (+6mV) of the electrogenerated Co1+showed that the degradation reaction occurs preferably at the solution interface. Electroscrubbing for CF4removal and the resulting products were controlled by the carrier gas. Air and H2carrier gases lead to the formation of CHF3and COF2. N2as the carrier gas caused 99.25% degradation with ethanol as a product. An 80% CF4degradation efficiency with CHF3as the product was observed when a mixture of N2and air was used as the carrier gas.
authors.affiliation: Department of Chemical Engineering, Sunchon National University, 255-Jungang ro, Suncheon-si, Jeollanam-do, 57922, South Korea, South Korea.
authors.forename: G
authors.initials: G
authors.lastname: Muthuraman
authors.affiliation: Department of Chemical Engineering, Sunchon National University, 255-Jungang ro, Suncheon-si, Jeollanam-do, 57922, South Korea, South Korea. Electronic address: ismoon@sunchon.ac.kr.
authors.forename: I S
authors.initials: IS
authors.lastname: Moon
keywords: Carbon tetrafluoride; Electrogenerated Co(1+); Reduction; Remediation