Semiconductor Mediated Photocatalytic Degradation of Plastics and Recalcitrant Organic Pollutants in Water: Effect of Additives and Fate of Insitu Formed H2O2

Phonsy, P D; Anju, S.G.; Jyothi, K. P.; Yesodharan, Suguna; Yesodharan, E.P.

doi:10.1515/jaots-2015-0111

Cited by 7 publications

(12 citation statements)

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“…For example, ROS finds applications in synthetic organic chemistry [1][2][3] photodynamic therapy, [4][5][6] and environmental remediation. [7][8][9] Also, ROS, in particular 1 O 2 , plays significant roles in cell signaling [10][11][12] and oxidative stress-related progression of various diseases. [13][14][15] Owing to the above impacts of 1 O 2 in our daily life, detection of 1 O 2 has emerged into an active research subject.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of singlet oxygen sensing using 9-substituted anthracene derivatives$$^{\#}$$

et al. 2019

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Singlet oxygen (1 O 2), the lowest excited-state of molecular oxygen receives great attention in basic research and clinical and industrial settings. Despite several spectroscopic methods available for 1 O 2 sensing, fluorescence sensing receives great attention, for which many fluorogenic sensors based on substituted anthracene are reported. Nonetheless, the roles of substituents on the sensing efficiency, in terms of detection time, remain largely unknown. In this work, we examine the 1 O 2 sensing efficiency of a fluorescence sensor based on a coumarin-anthracene conjugate, which is an electron donor-acceptor dyad, and compare the efficiency with that of 9-methylanthracene. Here, 1 O 2 is generated using the standard photosensitizer Rose Bengal, which is followed by estimation of the rate of reaction of 1 O 2 to the sensor and 9-methylanthracene. The second order reaction rate of the sensor is an order of magnitude less than that of 9-methylanthracene. The lower reactivity of the sensor to 1 O 2 suggests that the roles of substituents, such as electronic interactions, steric interactions and the reactivity of precursor complexes, on sensing efficiency should be carefully considered during construction of fluorogenic molecular sensors.

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Section: Introductionmentioning

confidence: 99%

Kinetics of singlet oxygen sensing using 9-substituted anthracene derivatives$$^{\#}$$

et al. 2019

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“…Once the catalyst is exposed to sunlight, the incident photons promote the separation of charge carriers, and electrons (e − ) acquire sufficient energy to jump from the valence band (VB) to the conduction band (CB) leaving holes (h + ) in their place 69 . The electrons in the CB interact with the oxygen (O 2 ) adsorbed on the ZnO NPs and superoxide radicals are generated (O 2 •− ).…”

Section: Resultsmentioning

confidence: 99%

“…• , which can combine with trapped electrons to generate H 2 O 2 , which ultimately produces hydroxyl radicals (OH • ) on the surface of the catalyst. 69,70 While holes (h + ) in the VB act as an oxidizing agent that interacts with water highly reactive OH • radicals. These radicals come into contact with the adsorbed MB molecules and the photocatalytic process proceeds with the oxidation of the dye.…”

Section: Mechanism Of Photocatalytic Degradation Of Mbmentioning

confidence: 99%

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Photocatalytic activity of ZnO nanoparticles synthesized from zinc nitrate and botanical extracts of neem, chrysanthemum, Mexican marigold and shiitake mushroom

López‐Martínez

Tejeda‐Ochoa

Cervantes-Gaxiola

et al. 2023

J of Chemical Tech & Biotech

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Background Green synthesis emerges as a need to obtain functional materials, but this also involves following certain principles that imply methods and inputs that are friendlier to health and the environment. A wide variety of materials can be synthesized under these principles, one of them being ZnO, which can be used for environmental, electronic and biomedical applications to mention a few. In this work, ZnO nanoparticles (NPs) were synthesized using aqueous extracts of neem, chrysanthemum, Mexican marigold and shiitake mushroom and subsequently used to degrade methylene blue (MB) under solar light irradiation. The NPs were characterized by UV–visible spectroscopy, transmission electron microscopy, X‐ray diffraction, Fourier transform infrared spectroscopy and thermogravimetric analysis to investigate the structural, optical and electronic properties of the NPs. Results The results indicate the formation of hemispherical NPs with aggregates in a size range of 5.38–28.37 nm. All the samples presented a hexagonal wurtzite crystalline structure. The best photocatalytic performance for MB degradation was shown by ZnO NPs obtained using Mexican marigold (0.0873 ± 0.008 min−1) followed by those obtained using shiitake mushroom (0.0602 ± 0.002 min−1), neem (0.0365 ± 0.02 min−1) and chrysanthemum (0.0357 ± 0.01 min−1). Conclusions Botanical aqueous extracts have the potential to be used in the synthesis of semiconductor materials, as they allow the modification of the size and band gap. Many of the phytochemicals present in the extracts help to improve the interaction between catalyst and pollutants, in this case MB, and therefore have a positive impact on the degradation of textile pollutants. © 2022 Society of Chemical Industry (SCI).

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“…This makes it easier for Fe to enter into Zn lattice sites without disturbing the crystal structure of ZnO and it contributes to improving its photocatalytic properties and conductivity [33]. Photocatalytic degradation with doped ZnO especially iron doping could be more efficient than UV activated nanoparticles such as TiO 2 , SiO 2 because iron doped ZnO could be activated in visible light due to its ability to absorb a larger portion of the visible portion of the electromagnetic spectrum [34]. Visible light helps in more degradation via generating more free radicals.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Polyethylene Plastic by Non-Embedded Visible-Light Iron-Doped Zinc Oxide Nanophotocatalyst

Zia¹,

Faisal²,

Shams

et al. 2021

Appl. Sci. Converg. Technol.

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This study investigated the photocatalytic degradation of pure low-density polyethylene (LDPE) and commercial-grade polyethylene (PE) films with iron-doped zinc oxide (Fe-ZnO) nanoparticles under visible light. The study was particularly focused on the role of reactive oxygen species (ROS) and the types of plastic degradation. The Fe-ZnO were synthesized using the co-precipitation method and characterized by TEM and XRD. Degradation of 6.35 cm 2 films of LDPE and commercial grade PE was tested under artificial LED light (84 lm/W) and dark in Fe-ZnO suspensions of 10 ml having concentrations ranging from 10 to 1000 𝜇g/ml. The results showed a maximum weight reduction of 13.8 % for pure LDPE films at 200 𝜇g/ml and 15 % for commercial grade PE at 1000 𝜇g/ml in 14 days. In comparison, no weight reduction was observed in the dark, which confirmed that the degradation was induced by the production of ROS moieties in visible light i.e., singlet oxygen (30.11 %), hydroxyl ions (30.45 %), and hydroxyl radicals (39.34 %). The degradation was further confirmed by FTIR with the formation of alcohols and alkenes and SEM analysis that showed visible cracks in both LDPE and PE. The study unveiled Fe-ZnO nanoparticles as an efficient substitute to degrade polyethylene under visible light.

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Semiconductor Mediated Photocatalytic Degradation of Plastics and Recalcitrant Organic Pollutants in Water: Effect of Additives and Fate of Insitu Formed H2O2

Cited by 7 publications

References 0 publications

Kinetics of singlet oxygen sensing using 9-substituted anthracene derivatives$$^{\#}$$

Kinetics of singlet oxygen sensing using 9-substituted anthracene derivatives$$^{\#}$$

Photocatalytic activity of ZnO nanoparticles synthesized from zinc nitrate and botanical extracts of neem, chrysanthemum, Mexican marigold and shiitake mushroom

Degradation of Polyethylene Plastic by Non-Embedded Visible-Light Iron-Doped Zinc Oxide Nanophotocatalyst

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