Applicability of light sources and the inner filter effect in UV/acetylacetone and UV/H 2 O 2 processes

Wu, Biao; Yang, Mei; Yin, Ran; Zhang, Shujuan

doi:10.1016/j.jhazmat.2017.04.011

Cited by 22 publications

(8 citation statements)

References 25 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The emission spectrum was detected with a miniature fiber-optic spectrometer (USB2000+, Ocean Optics Inc., Largo, USA). More details about the reactor were available in a previous report …”

Section: Methodsmentioning

confidence: 99%

“…The inner filter effect ( I CF ) was calculated with the following equation where φ is the photonic efficiency, that is, the ratio of the number of converted molecules to the total number of photons absorbed by the system; λ (nm) is the wavelength; Q is the absorbed number of photons of a given λ per unit time; and “w/” indicates the coexistence of light-absorbing substances. More details for the calculation are available in previous work …”

Section: Methodsmentioning

confidence: 99%

“…More details for the calculation are available in previous work. 31 ■ RESULTS AND DISCUSSION Phototransformation of QH 2 and AA. Quinones generally are stable in acidic to neutral solutions but are much more labile to reduction under alkaline conditions.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

“…More details about the reactor were available in a previous report. 31 LFP Experiments. Transient absorption experiments were conducted with an LP980 Edinburgh instrument (UK) with laser excitation at 266 nm from a Surelite I-10 Q-Switched Nd:YAG laser (35 mJ).…”

Section: ■ Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Photooxidation of Hydroquinone by Acetylacetone, a Novel Photosensitizer and Electron Shuttle

Jin

Zhang

et al. 2019

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Quinones are important electron shuttles as well as micropollutants in the nature. Acetylacetone (AA) is a newly recognized electron shuttle in aqueous media exposed to UV irradiation. Herein, we studied the interactions between AA and hydroquinone (QH 2 ) under steady-state and transient photochemical conditions to clarify the possible reactions and consequences if QH 2 and AA coexist in a solution. Steady-state experimental results demonstrate that the interactions between AA and QH 2 were strongly affected by dissolved oxygen. In O 2 -rich solutions, the phototransformation of QH 2 was AA-independent. Both QH 2 and AA utilize O 2 as the electron acceptor, but in O 2 -insufficient solutions, AA became an important electron acceptor for the oxidation of QH 2 . In all cases, the coexistence of AA increased the phototransformation of QH 2 , whereas the decomposition of AA in O 2saturated and oversaturated solutions was inhibited by the presence of QH 2 . The underlying mechanisms were investigated by a combination of laser flash photolysis (LFP) and reduction potential analysis. The LFP results show that the excited AA serves as a better electron shuttle than QH 2 . As a consequence, AA might regulate the redox cycling of quinones, leading to significant effects on many processes, ranging from photosynthesis and respiration to photodegradation.

show abstract

“…The emission spectrum was detected with a miniature fiber-optic spectrometer (USB2000+, Ocean Optics Inc., Largo, USA). More details about the reactor were available in a previous report …”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Environmental Science and Technologymentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Photooxidation of Hydroquinone by Acetylacetone, a Novel Photosensitizer and Electron Shuttle

Jin

Zhang

et al. 2019

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The photons absorbed by BrO 3 – and LMWOs were calculated by using the following eqs -: , where Q (einstein·s –1 ) is the sum of absorbed photon flux in the wavelength (λ) range of 210 to 400 nm by the substrate molecule, I 0, λ (einstein·cm –2 ·s –1 ) represents the collimated beam of photon irradiance intensity, S (cm 2 ) represents the illuminated cross section area, L (cm) is the light path, α s, λ (cm –1 ) represents the absorption coefficient of each substrate at λ , and α tot, λ (cm –1 ) is the total absorption coefficient of the solution at λ .…”

Section: Experimental Sectionmentioning

confidence: 99%

Effects of Low-Molecular-Weight Organics on the Photoreduction of Bromate in Water

et al. 2021

Self Cite

View full text Add to dashboard Cite

Reduction of bromate to bromide is of great significance for the remediation of bromate-containing waters. In natural water, some low-molecular-weight organics (LMWOs) ubiquitously coexist with bromate. However, LMWOs-mediated photoreduction of bromate has been rarely studied. Herein, we found that acids (formic acid, acetic acid, pyruvic acid, lactic acid, and oxalic acid), aldehydes (formaldehyde and acetaldehyde), alcohols (tert-butyl and isopropyl), ketones (acetone, 2,3butanedione, acetylacetone (AA), and 2,5-hexanedione), and quinones (hydroquinone and benzoquinone) could all enhance the photoreduction of bromate under UV irradiation. The mechanisms of LMWOs-mediated photoreduction of bromate were systematically elucidated. Special attention was paid to AA, because the photolysis of AA generates most of the other tested aliphatic LMWOs. The presence of LMWOs exerted complicated effects on the formation of disinfection byproducts (DBPs): On the one hand, the presence of AA inhibited the formation of hypobromous acid (HBrO), which is believed to be helpful to control the potential formation of DBPs, because HBrO is a key precursor of halogenated DBPs. On the other hand, the LMWOs possibly functioned as precursors of organic halogens. The results here may help us to better understand the fate of bromine species in the natural aquatic environment.

show abstract

Dyes and Biological Stains

2023

Destruction of Hazardous Chemicals in the Laboratory

View full text Add to dashboard Cite

Applicability of light sources and the inner filter effect in UV/acetylacetone and UV/H 2 O 2 processes

Cited by 22 publications

References 25 publications

Enhanced Photooxidation of Hydroquinone by Acetylacetone, a Novel Photosensitizer and Electron Shuttle

Enhanced Photooxidation of Hydroquinone by Acetylacetone, a Novel Photosensitizer and Electron Shuttle

Effects of Low-Molecular-Weight Organics on the Photoreduction of Bromate in Water

Dyes and Biological Stains

Contact Info

Product

Resources

About