Galvanic oxidation processes (GOPs): An effective direct electron transfer approach for organic contaminant oxidation

Carbocatalysts for Enhancing Permanganate Oxidation of Sulfisoxazole

“…Past works have also considered electron transfer as an important catalytic mechanism in Mn­(VII)/graphite and Mn­(VII)/rGO systems owing to their graphitic structure, which is conducive to electron shuttle. , Here, we applied a well-established galvanic oxidation process (GOP) − to prove the role of GO-mediated electron transfer caused by GO in the reactions between Mn­(VII) and SSX. As shown in Figure a, the oxidant, Mn­(VII), and the target contaminant, SSX, were physically separated in two independent cells to exclude their direct contact.…”

“…Galvanic oxidation processes (GOPs) experiments were conducted to verify the carbocatalyst-mediated electron transfer mechanism. − To initiate the reaction, the Mn­(VII) solution was added into cell A containing pH-buffered solutions with GO-coated titanium electrode, while stock solution of the target chemical (i.e., SSX, PMSO, and 2,2′-azino-bis­(3-ethylbenzothiazoline-6-sulfonate) (ABTS)) was added into the physically separated cell B containing pH-buffered solutions with GO-coated titanium electrode. The two cells were connected by a salt bridge while the two electrodes were connected by copper wires.…”

Atomically Dispersed Fe–N4 Site as a Conductive Bridge Enables Efficient and Stable Activation of Peroxymonosulfate: Active Site Renewal, Anti-Oxidative Capacity, and Pathway Alternation Mechanism

“…To further elucidate the update status of active sites, the kinetic analysis of the reaction data obtained in the FeSA-NC/PMS and N–C-900/PMS systems was performed in terms of the Langmuir–Hinshelwood mechanism (see details in the Supporting Information). By fitting the Langmuir–Hinshelwood model, an excellent fit ( R 2 ≥ 0.97) was observed between 1/ k obs and the initial concentrations of BPA or PMS in both the FeSA-NC/PMS and N–C-900/PMS systems (Figure a), which highlight the crucial role played by the FeSA-NC catalyst surface in facilitating the adsorption and reaction of PMS and BPA. , Figure b and Table S6 illustrate that the kinetic constants of k c [PMS] (5.47 × 10 –3 mol·L –1 ·min) and k c [BPA] (3.03 × 10 –3 mol·L –1 ·min) for FeSA-NC, representing the reaction rates of adsorbed PMS and BPA, respectively, were approximately two orders of magnitude higher compared to N–C-900 ( k c [PMS] = 6.44 × 10 –5 and k c [BPA] = 8.04 × 10 –5 mol·L –1 ·min). The significant disparity in kinetic constants strongly suggests that FeSA-NC exhibits higher activity compared to N–C-900 in terms of PMS activation and subsequent BPA oxidation, which align well with the observed experimental performance.…”

“…By fitting the Langmuir−Hinshelwood model, an excellent fit (R 2 ≥ 0.97) was observed between 1/k obs and the initial concentrations of BPA or PMS in both the FeSA-NC/PMS and N−C-900/PMS systems (Figure 5a), which highlight the crucial role played by the FeSA-NC catalyst surface in facilitating the adsorption and reaction of PMS and BPA. 42,43 Figure 5b and Table S6 S7). Degradation Pathways and Toxicity Analysis.…”

Polymer particles armored with cobalt oxide nanosheets for the catalytic degradation of bisphenol A

“…This process was repeated on the other side of the sheet to obtain an evenly coated graphite sheet with 4.8 mg of the CON-armored particles. 45,46…”