Electrochemical reactivity of bulky-phenols with superoxide anion radical

Zabik, Nicole L.; Anwar, Saba; Ziu, Iva; Martic-Milne, Sanela

doi:10.1016/j.electacta.2018.11.051

Cited by 13 publications

(17 citation statements)

References 39 publications

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“…Here, changes in the PL features from the reaction mixture containing an A-E-MHP NC sample and β-NPT were observed after KI addition (Figure S10 and Videos 1 and 2 in the Supporting Information). However, although the complete β-NPT photodegradation was not observed in the ATR-IR spectra after using A-E-MHP, we infer that the O 2 ●– species can also directly degrade the organic molecules to obtain nonradical products (reactions and ). , Hence, the decrease of C / C 0 relative concentration of β-NPT can be reached: Previous reports have reported that phenoxy-based radicals from the reaction of phenolic compounds and O 2 ●– are prone to form dimers, oligomers, or/and quinones as the main nonradical products in organic media. , …”

Section: Resultsmentioning

confidence: 80%

“…However, although the complete β-NPT photodegradation was not observed in the ATR-IR spectra after using A-E-MHP, we infer that the O 2 •─ species can also directly degrade the organic molecules to obtain non-radical products (reactions 6 and 7). 29,30 Hence, the decrease of C/C o relative concentration of β-NPT can be reached:…”

Section: Band Structure Of the Hot-injection And Anion-exchange Mixedmentioning

confidence: 99%

“…The O 2 -diffused CH 3 NH 3 PbI 3 layers produce highly reactive superoxide ions (O 2 ●– ) under illumination, trapping photoexcited electrons, which are otherwise transported in the solar cells. Although this fact is directly associated with the decrease of the photoconversion efficiencies in the solar devices, , the O 2 ●– can act as an active intermediate species in reactions involving the degradation of organic molecules like cyanotoxins, quinolones, and phenol derivates, , among others. Highly reactive O 2 ●– species have been also identified as the main factor for the PC performance of modified semiconductors such as Bi metal-deposited Bi 2 GeO 5 to mediate an efficient NO oxidation and metal–organic frameworks such as UiO-67 to perform the plasma-assisted dry reforming of methane in order to obtain CO and C 2 H 4 .…”

Section: Introductionmentioning

confidence: 99%

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Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Gualdrón‐Reyes

Rodríguez‐Pereira

González

et al. 2019

ACS Appl. Mater. Interfaces

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Within the most mesmerizing materials in the world of optoelectronics, mixed halide perovskites (MHP) have been distinguished due to the tunability of their optoelectronic properties, balancing both the light harvesting efficiency and charge extraction into highly efficient solar devices. This feature has drawn the attention of analogous hot-topics as photocatalysis for carrying out more efficiently the degradation of organic compounds. However, the photo-oxidation ability of perovskite does not only depend on its excellent light-harvesting properties, but also on the surface chemical environment provided during its synthesis. Accordingly, we studied the role of surface chemical states of MHP based nanocrystals (NCs) synthesized by hot-injection (H-I) and anion-exchange (A-E) approaches, on their photocatalytic (PC) activity for the oxidation of β-naphthol as a model system. We concluded that iodide vacancies are the main surface chemical states that facilitate the formation of superoxide ions, O 2 •─ , responsible for the PC activity in A-E-MHP. Conversely, the PC performance of H-I-MHP is related to the appropriate balance between band gap and a highly oxidizing valence band. This work offers new insights on the surface properties of MHP related to their catalytic activity in photochemical applications.

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Section: Resultsmentioning

confidence: 80%

Section: Band Structure Of the Hot-injection And Anion-exchange Mixedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Gualdrón‐Reyes

Rodríguez‐Pereira

González

et al. 2019

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

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“…The main formation of ROS (reactive oxygen species) such as superoxide occurs in the mitochondria through the interaction of O2 with Coenzyme Q (KoQ) [23]. Some electrons moving from NADH and other compounds to O2 may pass when KoQH interacts with O2 and form superoxide radicals [24].…”

Section: ±4mentioning

confidence: 99%

The Impact of Exposure to Aerosol Mosquitoes Repellent Related to Free Radicals on the Organs of Male Mice

Juswono¹

2020

GEOMATE

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From year to year, human activities using chemical substances lead to pollute ambient air and affect human health. This pollutant can pass through the respiratory system and disrupts the organ function, including lung, liver, blood, and kidney. It can be identified by the deformation found in the structure and function change of the related cells in these organs and the existence of free radical. On the other hand, each substance has a different composition and health effect. The possibility of the free radical type that is formed is also different and related to the substance. According to this background, it a need to determine the presence of free radicals in the mice's organs exposed to one push aerosol mosquito repellents as the substance. This study aimed to investigate the free radicals on the mice's organs due to the exposure to aerosol mosquito repellent and its relation with the organ damage of cell deformation. This study used male mice as the experimental animals that were divided into control and treatment groups. The study included two types of repellents, Type-A (25% of aerosol concentration) and Type-B (21.3% of aerosol concentration). Free radicals were detected using an electron spin resonance device. The results showed that the cell deformation due to the exposure of one push aerosol was different for each organ. The deformation levels were about 36% to 74% that depended on the aerosol concentration. The exposed aerosol generated anion superoxide (O2-) and singlet oxygen radicals (1O2) as the free radicals found in the observed organs.

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“…In some cases, depending on the type of electrolyte, reactive species such as sulfate radical (SO 4 -• ), persulfate ions (S 2 O 8 2-), active chorine speciation, active oxygen, etc. can be generated, which are either chemically/physically adsorbed on the anode surface or free in the bulk solution (Panizza and Cerisola, 2009;Radjenovic and Petrovic, 2017;Zabik et al, 2019).…”

mentioning

confidence: 99%

Study of the atenolol degradation using a Nb/BDD electrode in a filter-press reactor

et al. 2019

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The present paper deals with the atenolol (ATL) degradation by advanced anodic oxidation using a boron-doped diamond anode supported on niobium (Nb/BDD). Cyclic voltammetry performed on this electrode revealed that it presents a high quality (diamond-sp 3 /sp 2 -carbon ratio), high potential for OER and that ATL can be oxidized directly and/or indirectly by the electrogenerated oxidants, such as hydroxyl radicals, persulfate ions and sulfate radicals.Electrolysis experiments demonstrated that ATL degradation and mineralization follow a mixed (first and zero) order kinetics depending on the applied current density.At high applied current densities, the amount of OH radicals is very high and the overall reaction is limited by the transport of ATL (pseudo first-order kinetics) whereas for low applied current densities, the rate of OH radicals generation at the anode is slower than the rate of arrival of ATL molecules (pseudo-zero order kinetics). Estimated values of

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Electrochemical reactivity of bulky-phenols with superoxide anion radical

Cited by 13 publications

References 39 publications

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

Unravelling the Photocatalytic Behavior of All-Inorganic Mixed Halide Perovskites: The Role of Surface Chemical States

The Impact of Exposure to Aerosol Mosquitoes Repellent Related to Free Radicals on the Organs of Male Mice

Study of the atenolol degradation using a Nb/BDD electrode in a filter-press reactor

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