Selective photocatalytic oxidation of cyclohexanol to cyclohexanone: A spectroscopic and kinetic study

Estahbanati, M.R. Karimi; Feilizadeh, Mehrzad; Babin, Alexandre; Mei, Bastian; Mul, Guido; Iliuta, Maria C.

doi:10.1016/j.cej.2019.122732

Cited by 31 publications

(22 citation statements)

References 37 publications

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“…The compounds without ORMs are easily oxidized by hydroxyl radicals (•OH) that are formed during ozonation as oxidants, while molecules with ORMs are partially oxidized ( Kovalova et al, 2013 ). However, AOPs also possess some drawbacks, such as high operational and maintenance costs due to the use of expensive chemicals and equipment, high energy requirements, and complex design ( Karimi Estahbanati et al, 2020 ; Kovalova et al, 2013 ; Parida et al, 2021 ). In addition, the dissolved organic matter, solids, and nutrients present in wastewater can react with the oxidizing radicals and thereby reduce the system's reaction rate by consuming the radicals needed to oxidize the target pollutants ( Majumder and Gupta, 2021 ; Nicholas, 2019 ).…”

Section: Hospital Wastewatermentioning

confidence: 99%

An assessment of hospital wastewater and biomedical waste generation, existing legislations, risk assessment, treatment processes, and scenario during COVID-19

Parida

Sikarwar

Majumder

et al. 2022

Journal of Environmental Management

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Hospitals release significant quantities of wastewater (HWW) and biomedical waste (BMW), which hosts a wide range of contaminants that can adversely affect the environment if left untreated. The COVID-19 outbreak has further increased hospital waste generation over the past two years. In this context, a thorough literature study was carried out to reveal the negative implications of untreated hospital waste and delineate the proper ways to handle them. Conventional treatment methods can remove only 50%–70% of the emerging contaminants (ECs) present in the HWW. Still, many countries have not implemented suitable treatment methods to treat the HWW in-situ. This review presents an overview of worldwide HWW generation, regulations, and guidelines on HWW management and highlights the various treatment techniques for efficiently removing ECs from HWW. When combined with advanced oxidation processes, biological or physical treatment processes could remove around 90% of ECs. Analgesics were found to be more easily removed than antibiotics, β-blockers, and X-ray contrast media. The different environmental implications of BMW have also been highlighted. Mishandling of BMW can spread infections, deadly diseases, and hazardous waste into the environment. Hence, the different steps associated with collection to final disposal of BMW have been delineated to minimize the associated health risks. The paper circumscribes the multiple aspects of efficient hospital waste management and may be instrumental during the COVID-19 pandemic when the waste generation from all hospitals worldwide has increased significantly.

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Section: Hospital Wastewatermentioning

confidence: 99%

An assessment of hospital wastewater and biomedical waste generation, existing legislations, risk assessment, treatment processes, and scenario during COVID-19

Parida

Sikarwar

Majumder

et al. 2022

Journal of Environmental Management

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“…The use of ALD for innovative preparation of photocatalysts and photocatalytic reactor designs was reviewed recently by Eswar et al [162] Whereas the photocatalytic mechanism of water splitting has up to now been thoroughly investigated by Domen and coworkers, [163] investigations on the mechanism of photocatalytic alcohol oxidation are also a recent topic of interest. In this respect, Mul et al [164] provided an interesting contribution on the selective photocatalytic oxidation of cyclohexanol to cyclohexanone in which they propose a detailed mechanism. Quantum efficiency is a specific topic involving charge carrier generation and recombination.…”

Section: Photocatalysismentioning

confidence: 99%

“…Whereas the photocatalytic mechanism of water splitting has up to now been thoroughly investigated by Domen and coworkers, [163] investigations on the mechanism of photocatalytic alcohol oxidation are also a recent topic of interest. In this respect, Mul et al [164] . provided an interesting contribution on the selective photocatalytic oxidation of cyclohexanol to cyclohexanone in which they propose a detailed mechanism.…”

Section: Photocatalysismentioning

confidence: 99%

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A Perspective on Heterogeneous Catalysts for the Selective Oxidation of Alcohols

Najafishirtari

Ortega

Douthwaite

et al. 2021

Chemistry A European J

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Selective oxidation of higher alcohols using heterogeneous catalysts is an important reaction in the synthesis of fine chemicals with added value. Though the process for primary alcohol oxidation is industrially established, there is still a lack of fundamental understanding considering the complexity of the catalysts and their dynamics under reaction conditions, especially when higher alcohols and liquid-phase reaction media are involved. Additionally, new materials should be developed offering higher activity, selectivity, and stability. This can be achieved by unraveling the structure-performance correlations of these catalysts under reaction conditions. In this regard, researchers are encouraged to develop more advanced characterization techniques to address the complex interplay between the solid surface, the dissolved reactants, and the solvent. In this mini-review, we report some of the most important approaches taken in the field and give a perspective on how to tackle the complex challenges for different approaches in alcohol oxidation while providing insight into the remaining challenges.

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“…In the type-II (see Figure 3 ), the potential difference between the semiconductors will easily separate electrons and holes, preventing subsequent carrier recombination. The reason consists on the fact that the CB and VB of one semiconductor are higher than that of the other semiconductor, which assures an effective separation with holes and electrons at different sides of the heterojunction [ 51 , 52 , 53 ].…”

Section: Heterostructure Mechanisms For Photocatalytic Applicationmentioning

confidence: 99%

The Influence of Photoactive Heterostructures on the Photocatalytic Removal of Dyes and Pharmaceutical Active Compounds: A Mini-Review

Eneşca

Andronic

2020

Nanomaterials

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The diversification of pollutants type and concentration in wastewater has underlined the importance of finding new alternatives to traditional treatment methods. Advanced oxidation processes (AOPs), among others, are considered as promising candidate to efficiently remove organic pollutants such as dyes or pharmaceutical active compounds (PhACs). The present minireview resumes several recent achievements on the implementation and optimization of photoactive heterostructures used as photocatalysts for dyes and PhACs removal. The paper is focused on various methods of enhancing the heterostructure photocatalytic properties by optimizing parameters such as synthesis methods, composition, crystallinity, morphology, pollutant concentration and light irradiation.

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Selective photocatalytic oxidation of cyclohexanol to cyclohexanone: A spectroscopic and kinetic study

Cited by 31 publications

References 37 publications

An assessment of hospital wastewater and biomedical waste generation, existing legislations, risk assessment, treatment processes, and scenario during COVID-19

An assessment of hospital wastewater and biomedical waste generation, existing legislations, risk assessment, treatment processes, and scenario during COVID-19

A Perspective on Heterogeneous Catalysts for the Selective Oxidation of Alcohols

The Influence of Photoactive Heterostructures on the Photocatalytic Removal of Dyes and Pharmaceutical Active Compounds: A Mini-Review

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