Revisiting terephthalic acid and coumarin as probes for photoluminescent determination of hydroxyl radical formation rate in heterogeneous photocatalysis

Žerjav, Gregor; Albreht, Alen; Vovk, Irena; Pintar, Albin

doi:10.1016/j.apcata.2020.117566

Cited by 78 publications

(40 citation statements)

References 30 publications

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“…Monitoring 7OHC concentration enables indirect OH quantification as previously suggested [22]. However, 7OHC is also prone to oxidation and will compete for OH radicals as shown in previous studies [38,39]. Confirming this, it can be clearly seen in Figure 3 that the concentration of 7OHC increases in the initial stages of the experiment followed by an eventual decrease (concentration profiles of additional products available in Figure S2 of supplementary information).…”

Section: Coumarin Hydroxylation During Photocatalysis and Cavitationsupporting

confidence: 80%

“…[D] which is subject to degradation [38,39]. Additionally, the degree of degradation of [D] will be dependent on the operating conditions and nature of the process which may result in a lack of constancy when translating across AOPs.…”

Section: 𝛿 = [𝐷]mentioning

confidence: 99%

“…To avoid the same uncertainties as experienced with δ, simply reporting [OH]1 alongside operating conditions may be a more convenient method to compare AOPs. This can still provide insight to OH radical production in AOPs by providing a relative means of OH comparison [39] in addition to identifying most effective conditions for OH radical production/utilisation for that probe. Based on the proposed OH pathway and previous attempts at probe based OH quantification, it is suggested that reporting [OH]1 or [P] is a more suitable method of reporting OH radical concentrations and assessing AOPs rather than [OH]T.…”

Section: 𝛿 = [𝐷]mentioning

confidence: 99%

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Quantification of hydroxyl radicals in photocatalysis and acoustic cavitation: Utility of coumarin as a chemical probe

De-Nasri

Nagarajan

Robertson

et al. 2021

Chemical Engineering Journal

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Section: Coumarin Hydroxylation During Photocatalysis and Cavitationsupporting

confidence: 80%

Section: 𝛿 = [𝐷]mentioning

confidence: 99%

Section: 𝛿 = [𝐷]mentioning

confidence: 99%

See 1 more Smart Citation

Quantification of hydroxyl radicals in photocatalysis and acoustic cavitation: Utility of coumarin as a chemical probe

De-Nasri

Nagarajan

Robertson

et al. 2021

Chemical Engineering Journal

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“…The rate of formation of hydroxyl radicals was evaluated in this work as a function of the conversion of coumarin to 7-OHC [51]. It has been widely established that hydroxyl radicals, formed in the presence of an illuminated photocatalyst, can react with coumarin, which leads to the formation of 7-OHC.…”

Section: Photocatalytic Hydroxyl Radical Formationmentioning

confidence: 99%

Defective Grey TiO2 with Minuscule Anatase–Rutile Heterophase Junctions for Hydroxyl Radicals Formation in a Visible Light-Triggered Photocatalysis

et al. 2021

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The novelty of this work was to prepare a series of defect-rich colored TiO2 nanostructures, using a peroxo solvothermal-assisted, high-pressure nitrogenation method. Among these solids, certain TiO2 materials possessed a trace quantity of anatase–rutile heterojunctions, which are beneficial in obtaining high reaction rates in photocatalytic reactions. In addition, high surface area (above 100 m2/g), even when utilizing a high calcination temperature (500 °C), and absorption of light at higher wavelengths, due to the grey color of the synthesized titania, were observed as an added advantage for photocatalytic hydroxyl radical formation. In this work, we adopted a photoluminescent probe method to monitor the temporal evolution of hydroxyl radicals. As a result, promising hydroxyl radical formations were observed for all the colored samples synthesized at 400 and 500 °C, irrespective of the duration of calcination.

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“…The resultant •OH was validated by lighting the nonfluorescence Terephthalic Acid (TA) probe. [19] As illustrated in Figure 2C, the TA probe has no fluorescence emission in the existence of single S. aureus (curve a), CHFH (curve b), Fe 2+ (curve c), H 2 O 2 (curve d) while exhibits high fluorescence emission only in the coexistence of S. aureus and CHFH (curve e), which is similar as that in the Fenton reaction (curve f). The Fenton reaction originating from the collaborative interaction between bacteria and CHFH was further validated by monitoring the oxidation of transparent 3, 3′, 5, 5′-tetramethylbenzidine (Figure S4, Supporting Information).…”

Section: Bacteria-triggered Fenton Reaction and Generation Of •Ohmentioning

confidence: 55%

Bacteria‐Triggered Multifunctional Hydrogel for Localized Chemodynamic and Low‐Temperature Photothermal Sterilization

Lin

Fang

Hao

et al. 2021

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enormous challenge to current therapeutic systems and biomedical engineering. [2] As a promising alternative for conventional antibiotic therapy, photothermal therapy (PTT) has attracted ever increasing attention which converts light energy into heat energy via the photothermal effect of photothermal agents under the irradiation of near-infrared (NIR) laser. [3] The irreversible damage to cell membrane disruption and protein denaturation by the generated heat can induce bacterial death without generating drug resistance. [4] However, the high temperature induced by PTT may cause local collateral damage to normal cells and adjacent healthy tissues around heat-treated wounds owing to the inevitable thermal diffusion, leading to severe side effects of hyperthermia. [5] Moreover, achieving efficient hyperthermal administration typically requires high concentrations of photothermal agents, high power densities of lasers, or long-term laser exposure, which further increases the risk on human health. [6] To overcome the abovementioned drawbacks, low-temperature PTT (LT-PTT) at about 45 °C is a prospective modality to protect healthy tissues from high temperature damage. [7] While, LT-PTTinduced cell damage or bacterial apoptosis could be recovered with the assistance of heat shock proteins (HSPs), [8] thus making it difficult to guarantee efficient or complete eradication of bacterial infections. The incorporation of additional antimicrobial modalities for synergistic therapy is an important avenue to boost elimination efficiency. [9] As a suitable candidate, chemodynamic therapy (CDT) eliminates bacterial infections through the function of reactive oxygen species (ROS). [10] Considering that the heat generated via PTT can accelerate the generation of ROS in CDT which in turn improves the antibacterial activity of PTT, [11] the integration of CDT and PTT would be a charming strategy for facilitating LT-PTT. Furthermore, it is worthy of noting that the inherent short lifetime and long diffusion distance of ROS may compromise the antimicrobial activity. [12] Shortening the diffusion distance from ROS to the bacteria would be beneficial to enhance the efficiency of bacterial inactivation. [13] Hydrogels with cross-linked 3D networks and mesoporous structures have attracted great interesting in the field of Pathogenic infections seriously threaten public health and have been considered as one of the most critical challenges in clinical therapy. Construction of a safe and efficient photothermal antibacterial platform is a promising strategy for treatment of bacterial infections. Considering that high temperature does harm to the normal tissues and cells, herein, a bacteria-triggered multifunctional hydrogel is constructed for low-temperature photothermal sterilization with high efficiency by integrating localized chemodynamic therapy (L-CDT). The hydrogel is constructed by incorporating copper sulfide nanoparticles (CuS NPs ) with photothermal profile into the network of hyaluronic acid (HA) and Fe 3+ -EDTA complexes, ...

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Revisiting terephthalic acid and coumarin as probes for photoluminescent determination of hydroxyl radical formation rate in heterogeneous photocatalysis

Cited by 78 publications

References 30 publications

Quantification of hydroxyl radicals in photocatalysis and acoustic cavitation: Utility of coumarin as a chemical probe

Quantification of hydroxyl radicals in photocatalysis and acoustic cavitation: Utility of coumarin as a chemical probe

Defective Grey TiO2 with Minuscule Anatase–Rutile Heterophase Junctions for Hydroxyl Radicals Formation in a Visible Light-Triggered Photocatalysis

Bacteria‐Triggered Multifunctional Hydrogel for Localized Chemodynamic and Low‐Temperature Photothermal Sterilization

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