Photocatalytic destruction of stearic acid by TiO2 films: Evidence of highly efficient transport of photogenerated electrons and holes

Alofi, Saleh; O’Rourke, Christopher; Mills, Andrew

doi:10.1016/j.jphotochem.2022.114273

Cited by 6 publications

(2 citation statements)

References 43 publications

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“…This further validates our proposed methodologies. We note that zero order reaction kinetics were reported by other studies for this reaction [25,28] , the zeroth order kinetics indicate that the reaction rate is a sole function of the reaction rate constant, does not depend on the concentrations of reagents. When we vary the concentrations of α-terpinene, the dependence of the reaction rate on the concentrations of the reagent is clearly demonstrated in our work.…”

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confidence: 73%

A Kinetic Study of a Photo-Oxidation Reaction between α-Terpinene and Singlet Oxygen in a Novel Oscillatory Baffled Photo Reactor

Chen,

Prinsloo,

2023

Preprint

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By planting LEDs on the surfaces of orifice baffles, a novel batch oscillatory baffled photoreactor (OBPR) together with polymer-supported Rose Bengal (Ps-RB) beads are used to investigate reaction kinetics of a photo-oxidation reaction between α-terpinene and singlet oxygen (1O2). In the widely used NMR data analysis for this reaction, α-terpinene and ascaridole are treated as a reaction pair, assuming kinetically singlet oxygen is in excess or constant. We have, for the first time, examined the validity of the method, discovered that increasing α-terpinene initially leads to an increase of ascaridole, indicating that the supply of singlet oxygen is in excess. Applying kinetic analysis, a pseudo first order reaction kinetics is confirmed, supporting this assumption. We have subsequently initiated a methodology of estimating the 1O2 concentrations based on the proportionality of ascaridole concentrations with respect to its maximum under these conditions. With the help of the estimated singlet oxygen data, the efficiency of 1O2 utilization and the photo efficiency of converting molecular oxygen to 1O2 are further proposed and evaluated. We have also identified conditions where further increase of α-terpinene has caused decreases in ascaridole, implying kinetically that 1O2 has now become a limiting reagent, the method of treating α-terpinene and ascaridole as a reaction pair in the data analysis would no longer be valid under those conditions.

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confidence: 73%

A Kinetic Study of a Photo-Oxidation Reaction between α-Terpinene and Singlet Oxygen in a Novel Oscillatory Baffled Photo Reactor

Chen,

Prinsloo,

2023

Preprint

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“…For the degradation of large organic molecules such as metoprolol [153,154], methylene blue [137,155], paracetamol [156], 3-amino-2-chloropyridine [157], pindolol [158], clopyralid [159], picloram [160], ethylene [161], 4-chlorophenol and methylene orange [162], etc., it was determined that mesoporous TiO 2 exhibits high photocatalytic activity. Additionally, photodegradation of stearic acid was achieved using mesoporous and microporous TiO 2 films [163], TiO 2 self-cleaning films [164], and TiO 2 films prepared by template-assisted sol-gel [165]. Mills et al [166] reported the findings of a detailed study of the photocatalytic properties of Pilkington ActivTM glass in the degradation of stearic acid.…”

Section: Factors Affecting Photocatalytic Properties Of Tio 2 41 Type...mentioning

confidence: 99%

Titanium Dioxide as the Most Used Photocatalyst for Water Purification: An Overview

2022

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Titanium dioxide (TiO2), one of the most frequently used materials in general, has emerged as an excellent photocatalytic material for environmental applications. In this review, principles and mechanisms of the photocatalytic activity of TiO2 have been analyzed. Structural and physical specificities of TiO2 nanoparticles, such as morphology, crystal structure, and electronic and optical properties, have been considered in the context of photocatalytic applications. A review of the influence of several factors, such as the type and dimensions of photocatalyst particles, pH of the solution, the influence of oxidants/electron acceptors, and light intensity on photocatalytic properties of TiO2, has been provided. Superhydrophilicity as an intrinsic property of the TiO2 surface was discussed through surface reconstruction on TiO2 during the reversible hydrophilic changes. Additionally, attention was paid to improving the photocatalytic properties of TiO2 particles through aggregation and agglomeration.

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Mechanochemical synthesis of Ag/TiO2@PANI nanocomposites for enhanced toluene photocatalytic degradation under near-ultraviolet light

Zhu,

Wang,

et al. 2024

Chinese Journal of Chemical Engineering

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Photocatalytic destruction of stearic acid by TiO2 films: Evidence of highly efficient transport of photogenerated electrons and holes

Cited by 6 publications

References 43 publications

A Kinetic Study of a Photo-Oxidation Reaction between α-Terpinene and Singlet Oxygen in a Novel Oscillatory Baffled Photo Reactor

A Kinetic Study of a Photo-Oxidation Reaction between α-Terpinene and Singlet Oxygen in a Novel Oscillatory Baffled Photo Reactor

Titanium Dioxide as the Most Used Photocatalyst for Water Purification: An Overview

Mechanochemical synthesis of Ag/TiO2@PANI nanocomposites for enhanced toluene photocatalytic degradation under near-ultraviolet light

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