Visible light enhanced photosynthesis of C-C bonds using PdO/Pd@PEDOT nanocomposite

Gogoi, Rituporn; Dohling, Honourius Mebansharai; Singh, Aameek; Sharma, Kajal; Sagara, Prateep Singh; Siril, Prem Felix

doi:10.1016/j.jcat.2022.08.027

Cited by 18 publications

(14 citation statements)

References 69 publications

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“…Nevertheless, the higher concentration of a photocatalyst sometimes educes reaction rate due to the scattering dominant phenomenon rather than light absorption. 47,48 As a result, we have observed saturated removal abilities at higher catalyst amounts (Figure S11). Alternatively, this validates the Fenton-like degradation is considerably economic at lower concentrations of the photocatalyst.…”

Section: B) Photo-fenton Like Reactionsmentioning

confidence: 72%

“…The action spectrum can be obtained by one-to-one mapping of AQY over the absorbance spectrum of the photocatalyst. 47 As shown in Figure 8c, the results show that the photocatalyst is truly dependent on visible light which are reasonably appealing. Additionally, we have calculated the photocatalytic space time yield (PSTY).…”

Section: Impact Of Light Towards Photocatalytic Reactionsmentioning

confidence: 77%

“…This is primarily caused by the larger number of photons absorbed at increasing light intensities. 47,49 Initially, the efficiency was rapidly enhanced up to 2 mW cm -2 whereas a slower reaction rate is evident as the intensity increased further. The steady increment in degradation efficiency may be caused by the formation of more • OH species by the dissociation of H2O2, which are likely self-scavengers at higher intensities as discussed earlier (Eq.…”

Section: Impact Of Light Towards Photocatalytic Reactionsmentioning

confidence: 99%

“…To take these aspects into consideration, we generated a comparison factor (CF) to serve as an example of a comparative study. 47,51 The CF values are based on the ability to transform a large amount of pollutants (in the numerator) while using a minimal amount of energy and raw materials (in the denominator), as evaluated by the Eq. 5.…”

Section: Impact Of Light Towards Photocatalytic Reactionsmentioning

confidence: 99%

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Mechanically Activated Covalent Organic Framework as Metal Free Photocatalyst for Continuous Flow Fenton-like Degradation of Organic Pollutants and Hexavalent Chromium Reduction

Gogoi

Jena

Singh

et al. 2023

Preprint

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A highly active photocatalyst is unveiled for the Fenton-like reactions in visible light. A metal-free covalent organic framework (COF) was highly active via a novel mechanical pulverization process. Under visible light, the activity of pulverized COF reached an apparent quantum yield of 41% for Fenton-like degradation. The exceptional performance is due to the conduction band's induced high excited electron density. The outstanding performance does not require pH adjustment by external means, unlike metal-based photocatalysts. The pulverized COF can be recycled up to five times. For industrial scale implementation, the photocatalyst outperformed in a continuous flow channel. The photocatalytic space-time yield (PSTY) was increased by 28 times over conventional batch photocatalysis. For successful chemical reactions, an exceedingly small amount of photocatalyst is required. Additionally, a very high photoreduction rate was also observed for hexavalent chromium, which was significantly better than the parent COF.

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Section: B) Photo-fenton Like Reactionsmentioning

confidence: 72%

Section: Impact Of Light Towards Photocatalytic Reactionsmentioning

confidence: 77%

Section: Impact Of Light Towards Photocatalytic Reactionsmentioning

confidence: 99%

Section: Impact Of Light Towards Photocatalytic Reactionsmentioning

confidence: 99%

See 2 more Smart Citations

Mechanically Activated Covalent Organic Framework as Metal Free Photocatalyst for Continuous Flow Fenton-like Degradation of Organic Pollutants and Hexavalent Chromium Reduction

Gogoi

Jena

Singh

et al. 2023

Preprint

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“…[17][18][19][20][21] Alternatively, Chemical oxidative polymerization (COP) is a highly appealing approach that is used for preparing CPs. 10,22 COP requires only an oxidizing agent (metal-based or metal-free) and offers extended π-conjugations in a single-step reaction. CPs possess excellent visible light absorption ability as well as electrical conductivity due to the extended π-conjugation.…”

Section: Introductionmentioning

confidence: 99%

Metal-free Conjugated Polyphenothiazine Nanostructures as Visible Light Active Photocatalysts for the Removal of Organic Pollutants and Selective Aerobic Oxidation of Sulfides

Gogoi

Jena

Singh

et al. 2023

Preprint

Self Cite

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Phenothiazine (PTZ) and its derivatives have traditionally been used for photocatalytic molecular oxygen activation in a variety of chemical transformation processes. Despite having a high reduction potential, phenothiazine is transparent under visible light and thus has limited photocatalytic activity at low energies of incidence. We have synthesized highly conjugated polyphenothiazine (PPTZ) nanomaterials via Chemical oxidative polymerization (COP) of PTZ in a one-pot reaction. Polymerization with metal-free oxidizing agents converted PTZ from being a UV-active material to visible light active via π-conjugation extension. Thus, PPTZ was found to be a highly active metal-free photocatalyst for the selective aerobic oxidation of alkyl arylthiosulfide to the corresponding sulfoxide under visible light. This is the first example of metal-free, conjugated PPTZ nanoparticles as a visible light-active photocatalyst for the activation of triplet molecular oxygen. The reduction potential of PPTZ was found to be suitable for the activation of triplet oxygen to produce a moderately reactive superoxide radical anion (O2⋅−) for selective oxidation reactions. PPTZ also exhibited highly active photocatalytic decomposition of organic pollutants under aerobic conditions.

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Photodegradation of polyethylene debris in water by sulfur-doped TiO2: system optimization, degradation mechanism, and reusability

Sharara,

Samy,

Mossad

et al. 2023

Environ Sci Pollut Res

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Given the immense threats of microplastics, we herein investigate photodegrading the debris of polyethylene bags (PBs) by sulfur-doped titanium dioxide. The optimization of operating parameters showed that controlling the water pH at 3 and introducing PBs by 0.10 g/L under a catalyst dose of 1.25 g/L reduced the polyethylene mass by 3.10% in 7 h, whereas raising the catalyst dose to 3 g/L improved the mass reduction to 4.72%. The extension of degradation time to 100 h at pH 3, catalyst dosage of 3 g/L, and PBs concentration of 0.10 g/L increased the mass loss ratio to 21.74%. Scanning electron microscopy of PBs after 100 h of photodegradation showed cracks on the surface accompanied by the increase of carbonyl index from 0.52 to 1.41 confirming the breakdown of the polymeric chain. Total organic carbon increased from 0.80 to 7.76 mg/L in the first 10 h of photodegradation, then decreased to 1 mg/L after extending the reaction time to 100 h due to the mineralization of organic intermediates generated from the photodegradation of PBs. Trapping tests exhibited the major role of hydroxyl radicals in the degradation system, and the catalyst showed high stability under five repetitive runs. This study proposes an efficient treatment system that can be implemented on a wider scale utilizing the synthesized catalyst to degrade plastics efficiently before their release to water streams.

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Visible light enhanced photosynthesis of C-C bonds using PdO/Pd@PEDOT nanocomposite

Cited by 18 publications

References 69 publications

Mechanically Activated Covalent Organic Framework as Metal Free Photocatalyst for Continuous Flow Fenton-like Degradation of Organic Pollutants and Hexavalent Chromium Reduction

Mechanically Activated Covalent Organic Framework as Metal Free Photocatalyst for Continuous Flow Fenton-like Degradation of Organic Pollutants and Hexavalent Chromium Reduction

Metal-free Conjugated Polyphenothiazine Nanostructures as Visible Light Active Photocatalysts for the Removal of Organic Pollutants and Selective Aerobic Oxidation of Sulfides

Photodegradation of polyethylene debris in water by sulfur-doped TiO2: system optimization, degradation mechanism, and reusability

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