Comparison of hydroxyl radicals generation during granular activated carbon regeneration in DBD reactor driven by bipolar pulse power and alternating current power

Yuan, Deling; Tang, Shoufeng; Qi, Jinbang; Li, Na; Huang, Haiming

doi:10.1016/j.vacuum.2017.06.003

Cited by 11 publications

(7 citation statements)

References 34 publications

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“…To investigate the role of ·OH and O 2 · – in the photodegradation of the four pyrethroids, SA and SOD were selected as the scavengers for ·OH and O 2 · – , respectively. SA is a most commonly used probe compound to detect ·OH because of its high reactivity with ·OH ( k = 5.0 × 10 9 M –1 s –1 ) and specific for ·OH because the degradation of SA by O 2 · – /ROO·/RO·/R· is negligible. − As shown in Figure , the presence of SA significantly decreased the photodegradation rates of pyrethroids to 1.79 (±0.14) × 10 –2 –4.56 (± 0.34) × 10 –2 h –1 while the addition of SOD inhibited the photodegradation to a much less extent (2.96 (±0.14) × 10 –2 –10.0 (±0.30) × 10 –2 h –1 ) ( p < 0.05, Figure S5). The degradation rates of pyrethroids without SA were 2.08 to 4.51 times higher than those in the presence of SA, indicating that ·OH played a key role in the photodegradation of pyrethroids on spinach leaves (eq ).…”

Section: Resultsmentioning

confidence: 97%

Elevated Temperatures Decrease the Photodegradation Rate of Pyrethroid Insecticides on Spinach Leaves: Implications for the Effect of Climate Warming

Chen

et al. 2020

Environ. Sci. Technol.

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Climate warming is seldom considered in the transformation of pesticides on a plant leaf. This study investigated the effects of photodegradation temperature and spinach growth temperature from 15 to 21 °C on the photodegradation of bifenthrin, cypermethrin, fenvalerate, and deltamethrin on spinach leaves under xenon lamp irradiation in climate incubators. The photodegradation temperature had minor effects on pyrethroid photodegradation. Interestingly, the photodegradation rates decreased with increasing spinach growth temperature. For example, the photodegradation rate constant of bifenthrin on a spinach cultivated at 15 °C (3.73 (±0.59, 95% confidence level) × 10–2 h–1) was 1.9 times higher than that at 21 °C (1.96 (±0.17) × 10–2 h–1). Hydroxyl radicals (·OH) played a dominant role in the photodegradation. We speculate that ·OH originated from the degradation of hydroperoxide that was formed by oxidation of phenolic CHCH, aliphatic CH3 and aromatic C–O–C, and subsequent hydrogen abstraction. The contents of these functional groups decreased with increasing growth temperature, which resulted in lower photodegradation rates at higher growth temperatures. A possible photodegradation pathway including ester bond cleavage, decyanation, and phenyl group removal was proposed. This work provides new insight into the effects of climate warming on the generation of reactive oxygen species and the transformation of pesticides on a plant leaf.

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Section: Resultsmentioning

confidence: 97%

Elevated Temperatures Decrease the Photodegradation Rate of Pyrethroid Insecticides on Spinach Leaves: Implications for the Effect of Climate Warming

Chen

et al. 2020

Environ. Sci. Technol.

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“…The performance of the PBDBD reactors can be influenced by the thickness of the dielectric barrier. Mei et al investigated the effect of dielectric barrier thickness (1.5, 2.0, and 2.5 mm) on CO 2 conversion and reported that the conversion and energy efficiency were reduced by ~15% for a fixed SIE (120 kJ/L) [196] . In this study, when the dielectric barrier thickness increased, the plasma volume and the residence time decreased, resulting in reduced conversion efficiency.…”

Section: In-plasma Catalysismentioning

confidence: 99%

Boosting VOCs elimination by coupling different techniques

Khawaja¹,

Veerapandian²,

Bitar³

et al. 2022

Chem Synth

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Volatile Organic Compounds (VOCs) are known to be hazardous and harmful to human health and the environment. In mixtures or during repeated exposures, significant toxicity of these compounds in trace amounts has been revealed. In vitro air-liquid interface approaches underlined the interest in evaluating the impact of repeated VOC exposure and the importance of carrying out a toxicological validation of the techniques in addition to the standard chemical analyses. The difficulties in sampling and measuring VOCs in stationary source emissions are due to both the complexity of the mixture present and the wide range of concentrations. The coupling of VOC treatment techniques results in efficient systems with lower operating energy consumption. Three main couplings are outlined in this review, highlighting their advantages and relevance. First, adsorption-catalysis coupling is particularly valuable by using adsorption and catalytic oxidation regeneration initiated, for example, by selective dielectric heating. Then, several key aspects of the plasma catalysis process, such as the choice of catalysts suitable for the non-thermal plasma (NTP) environment, the simultaneous removal of different VOCs, and the in situ regeneration of the catalyst by NTP exposure, are discussed. The adsorption-photocatalysis coupling technology is also one of the effective and promising methods for VOC removal. The VOC molecules strongly adsorbed on the surface of the photocatalyst can be directly oxidized by the photogenerated hole on the photocatalyst (e.g., TiO2).

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“…Rearranging and applying natural logarithm yields the following: Fig. 10 displays the graphs of 1/T versus ln[Àln(1 À X c )] obtained using eqn (8) with the data in Fig. 5; Àb and ln a represent the slope and intercept, respectively.…”

Section: Conversion Characteristics Caused By Plasma Catalysismentioning

confidence: 99%

“…7 The discharge strength and active species yield of bipolar pulses are greater than those of AC and DC. 8 Several studies have applied plasma catalysis to remove VOCs using supported metals, [9][10][11] metal oxides, [12][13][14] supported metal-metal, 15 metal-metal oxides, 16,17 or perovskite-type [18][19][20] catalysts. Perovskite oxide has a crystal structure similar to that of calcium titanate (CaTiO 3 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of oxygen-containing functional groups on the synergy effect in pulsed bipolar plasma-catalytic reactions of volatile organic compounds

Liang

Lee

2020

RSC Adv.

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Comparison of hydroxyl radicals generation during granular activated carbon regeneration in DBD reactor driven by bipolar pulse power and alternating current power

Cited by 11 publications

References 34 publications

Elevated Temperatures Decrease the Photodegradation Rate of Pyrethroid Insecticides on Spinach Leaves: Implications for the Effect of Climate Warming

Elevated Temperatures Decrease the Photodegradation Rate of Pyrethroid Insecticides on Spinach Leaves: Implications for the Effect of Climate Warming

Boosting VOCs elimination by coupling different techniques

Effects of oxygen-containing functional groups on the synergy effect in pulsed bipolar plasma-catalytic reactions of volatile organic compounds

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